Nelson Boulder Bank - WHAT IT ISN"T
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- Опубліковано 6 лип 2024
- Was it made by an earthquake? a tsunami? glacier?
Warren Dickenson has been researching the formation of the Nelson Boulder Bank for many years. At first sight it looks like any other coastal spit, but this one has a difference that makes it unique.
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One thing that can't be forgotten about is that during the last ice age, relatively recently in geological terms, the Tasman Bay didn't exist. The shelf of unsorted material that is under the boulders and is the source of the rocks that make up the bank could possibly be alluvial deposits that eroded off the hills above Nelson and emplaced there during that time. Then once sea levels rose, the action of the waves started separating the material to build the bank.
Yes, except the hills are made of completely different material which makes it problematic
@@OutThereLearning Interesting. I would have figured there would have been more of that rock type in the area, but after looking at a geologic map, it truly is just that small sliver of that rock type along the cliffs north of the bank. After watching your videos I had just thought you meant that it was simply the only source being directly eroded by the ocean. That whole area just seems to be a crazy patchwork of different sedimentary and igneous rock types.
From what I understand, the presence of the formation is not what is strange here, it's the composition 🙂
@@OutThereLearning Quick Note : Get that out of your head that the rocks have to be from the beach. They most likely came from 100's of km's away and were carried by ice and then deposited as part of a dynamic cycle. :-)
My kids are also becoming experts in the Nelson boulder bank, whether they like it or not. But seriously they do enjoy all of you videos.
That's the spirit!
Thank you this is all very interesting. One option to solve the mystery could also be the use of seismic data; from a small boat which would be much less intrusive and cheaper than drilling?
i agree try seismic
Thank you for these wonderfully edited and narrated videos! A great way to stay connected with earth science during lockdown :-)
Great that you are enjoying the videos!
I live on the small island of Grand Manan, in the Bay of Fundy , on the east coast of Canada. We have several of these boulder banks on the western side of our island. They create small ponds that have a moderate rise and fall of tides by way of water washing through the bank. The largest of these is called Dark Harbour. It has a man made outlet which allows a larger fluctuation of the tides. I expect the process for forming these is the same as Boulder Bank.
Sounds like you live in a special place - famous for its huge tides :-)
So interesting thank you so much from South Africa 🇿🇦
Thanks for watching!
My greatest memory involving the Bolder Bank was eating an early evening meal at The Boat Shed. There was not a breath of wind, but for some unknown reason the local sailing club was running dinghy race. In the two hours it took us to eat, the sailing dinghies barely made it across the lagoon to the Bolder Bank.
Nice! haha
Well, I wasn't expecting to see this pop up in my recommendeds.. I'm from Nelson, and about 20 years ago I walked the length of the Boulder Bank (and back again). I started with my family, but they had had enough after about 3/4 of the distance, but I refused to go that far and turn around, so I jogged the rest of the way and caught up with them on the way back!
I have also swam out to Haulashore Island which was a lot of fun to explore (met a huge Sea Lion who was not expecting company), and I discovered that Fifeshire Rock has a tunnel beneath it, and swam through that too.
What a champ! 😀
Tahuna beach in Nelson is boulders like the boulder bank, it has been a sandy beach since the Applebee river change course during a flood, the most interesting feature of Tasman bay, Golden bay is boulder bank, golden sand beaches, then the sand Farewell Spitt.
I live on the hills near boulder bank in Nelson and quite often in stormy weather when lying in bed find it hard to sleep as the grinding sound from the boulders/cobbles is quite loud. This grinding sound is obvious movement of the rocks. Beautiful place.
Thanks for your description
You are a wonderful science communicator. Thank you 😎
Thank you 😊
It's truly amazing! There was no one on the beach when we came but we did read the warning sign.
My great great great granfather ( James Cross) surveyed the boulder bank for the nz company in 1839 for a safe anchorage for nelson setllement. He went on to be harbour pilot there.
Thanks for sharing that amazing connection!
My home town and another great informative video. Thank you :-)
I like nothing more than when someone really appreciates the environment where they live ! Thanks!
A brilliant living question. Thanks for the honest look into scientific thinking.
Thanks for your nice comment :-)
We have the same type of formations in Norway, on the eastern shore of Porsanger fjord. It's not as long as Nelson, but the formation is very similar looking. The gravel and rocks are of the same type and size. The formation is heavly beaten by Barents sea winter storms from the north, and probably made by the waves. North of the formation (out the fjord) the coast is mostly rocky for many miles.
Thanks, that's interesting!
Very interesting follow up to your previous post :)
Thank you!
Thank you. Another informative video.
I'm pleased that you enjoyed it :-)
The real question is what happened to the land behind the bank, I suspect it was all once dry land before the ice melted, there is also similar formations only on a much grander scale, happening right now in Greenland.
Thanks for watching and for your comment!
Hi Julian thanks again for a very interesting talk, thanks also to Warren for his determinism and persistence in studying this unusual phenomenon. It seems to me, after all the inputs, that there can only be one answer to this problem and that is Natural Gradation. This subject is well covered in soil mechanics but not so well in a marine environment. The angle of the sea bed, perhaps gradual, the strength of the wave energy and the occasional storm or tsunami would all point to a bit of a mix in particle size, but an average, persistent effect of wave and breaker form has done its job. I'm probably barking up the wrong tree, but I think this might be worth throwing into the pot. Thanks again for involving everyone, Pete on the Isle of Wight.
Thanks for your thoughts and ideas!
Thanks to you both, and the commenter for Chesil beach reference! Was about to mention it vis tidal patterns... Then you started with longshore drift😁
Cheers!
The only real answer seems to be some sort of tectonic uplift either lifting and exposing the rock bed (combined with longshore drift), or the opposite, seismic sinking exposing previously flat shoreline to erosion (and longshore drift again).
Considering the rocks are all of the same type as bluffs in the area, they haven't travelled too far. The fact they vary so much in size and are well rounded would suggest accelerated abrasion by the ocean. Glacial till tends to have broad, flatter appearance to individual rocks, usually with striations.
The mud/ organic material I would guess is simply material that has filtered down from the surface over the years, helping stabilise the structure offshore.
Do we know what is underneath the mudflats behind? Similar boulders/stones?
I think makey bay was up lifted in an earthquake long ago into a huge unstable spit and has slowly been eroded away by the weather and natural currents in area. Food for thought.great vid guys
Thanks!
"Backswash" a word I've never heard but which makes perfect sense to me as soon as I hear it.
Could it be a partially sorted layered sequence? Storm powered wave action would move the large boulders along with the small pebbles, conventional wave action would then move the pebbles onto the spit, thus creating the sequence of large to small. Possible source could also be a paleo-river channels extending from the granodiorite cliffs during glacial periods, that then are moved again by wave action. The fact that the lower layers of the deeper sections show the presence of small pebbles leads me to believe that it's actually an unsorted deposit originally (think a large flat bank) that is then surface sorted into a more normal profile later.
I find it incredible that in such a geologically aware country, no research has been done into such an incredible feature.
Its not needing testing to destruction...just a few underwater holes!!
C'mon NZ...Get to know
There has been research over many years. There is still debate though! Thanks for watching and your comment!
A storm would greatly upset a drilling rig. I reckon that it would be expensive but maybe the government could assist by granting say a dollar fifty for each dollar that crowd funding would bring?
Enjoyed the discussion, I live on a wave cut platform, Perth WA, we have orientated reef rock and dunes when the sea level was 30m or 40m higher, my suggestion is this, is the boulder bank such a feature?
Wow its amazing i would like to see it when i come to NZ.
It will still be there! Thanks for watching
I was talking to some old sailors down in the Nelson marina last week. They reckon that other civilisations were here before and built it…… it was an interesting yarn.
Yep it does look man made at first sight!
The Boulder bank certainly is a remarkable structure. I would go for the Granodiorite basement off shore providing fragmented rock raw material with which the current and the waves can go about doing their work perhaps in the same way a Sandspit is formed but of course rocks once in place are more stable than sand particles.
Thanks for your thoughts
Is there any organic matter in the sub boulder layer that could be used to date the feature? The material looks water abraded , ie rounded but no sign of grading by size which suggests a rapid process like a slip? That in a way contradicts itself unless the slip came from a source of water eroded material. If I win Lotto I'll fund the research!
Yep - some shell material from that layer dates it at no older than about 7000 years.
Thanks for the offer! - we definitely recomment that you by lots of tickets :-)
Great question. We would really love to get more ages for the Boulder Bank but it's a difficult problem. There are plenty of shells, which can be found in the sub-boulder layer and of the 4 dates we have from these shells, none is older than 7300 years ago. This means that the sub-boulder layer was reworked from 10,000 to 7,000 years ago when sea level rose and stopped near its present level. Possibly if we could dig below the re-working in the sub-boulder layer we could obtain older ages. Although I do not have hard evidence, I think the sub-boulder layer, which I call the Boulder Bank formation, is very old perhaps >500,000 years and has been through multiple re-workings with each sea level rise (there have been about 10 periods of sea level rises in the past million years). Problem is that each sea level rise destroys any evidence of the previous boulder banks. Sorry for the complicated answer but I think the boulder bank problem is complicated and we are seeing only the most recent Boulder Bank.
(Note that Carbon-14 dates from either shell or organic matter has a 'dead carbon' age of about 45,000 years - meaning that all the C14, with a half-life of 5700 years, has decayed and cannot be detected).
@@OutThereLearning no older than 7000 years, so around the younger dryas period?
If cosmic rays are what are the measure of c14, is it considered as a constant or do they take into account the wild fluctuations in magnetic field strength at certain points of time, which would increse or decrease the amount of cosmic charged particles that would impact?
I like the idea of a rocky ridge thats been eroded down of millions of years
Thanks for your idea!
Brilliant video, your a great narrator, I can’t wait to see the video filmed on the ESCI 301 field trip with prof naish!
Cheers Gabriel!
@@OutThereLearning I thought I recognized you on the trip, didnt know where from, turned out to be this channel!
I think it was a coastline and the ground behind it collapsed and the ocean filled in. Travel east along the boulder bank until it meets land again and describe the shoreline there. It's the same as the boulder bank.
Thanks so much for this! I think establishing its age definitively will do a lot to reveal its origin.
Thanks for your comment :-)
This morning I was walking my dog at Te Puru on the western side of the Coromandel peninsula. I note, now that I've seen what you are speaking of and having been sailing on Nelson harbour very recently, that just above the high tide line at Te Puru, there is a raised hump, and the land behind that back to the escarpment formed by the mountains behind is lower. Not as low as the mudflats and harbour behind the boulder bank, but noticeable. I'm wondering if the mechanism that has produced those are similar.
Sounds like a storm beach ridge, like the top of the boulder bank
There's also a wide boulder platform sea-side of Aberyswtyth to Aberaeron coast in Wales. There is clearly solid rock bed under some of it - and in places it is folded up into bluffs, but in other places the underbed (if present) is not visible at all. I think the general drift trend is southwards, although the prevailing weather comes in the opposite direction.
Fascinating stuff - and a great channel to watch. Looking at the aerial view about 9:53 I was struck by the symmetry of the bank and it's alignment as a beach with the rest of the topography - inshore it looks like an old in-filled lagoon and further to the NE it is grassland.. A google map view of the area suggests that Moturoa Island is a similar construction - either in the making or a "has been" - sorry about my terminology - I'm an old wannabe geologist! Could this be sediment filling into Tasman Bay - via the West Coast/Farewell spit ...?
Thanks for your comment - As you will have seen in the video, there can be similar looking features (such as Chesil Beach in the UK) but on closer inspection there are differences that require a whole different story to explain them.
There is inherent symmetry in several of the forces creating the bank. Consistent wave activity, gravity, water level, tidal activity and more. These ultimately contribute to what you see as symmetry in the bank.
It was deposited by the great Tsunami about 5000 years ago. The sea bed was scoured out and filtered by size and weight of the material, the heavy boulders were pushed up toward the land as far as they would go and the lighter material went beyond that point. As the sea receded the lighter material remained forming the mudflats. The boulders now formed a barrier separating the mudflat from the sea that is Tasman Bay. This occurred also at Cable and Delaware bays. This was a huge Tsunami with a height of maybe as high as 180 metres and though the path of the wave was not directly into Tasman Bay the in rush of water would have been immense and changed the coast forever.
This resembles Birdlings Flat to my untrained eye, and I never cold understand how that "beach" came to be. Could these two features possibly be formed by the same type of mechanism?
What temperature is the water at the nelson boulder bank ?
Would the Motueka Sandspit be caused in the same way as Boulder bank?
Now I'm sitting here watching this... totally entertained.... wondering how a Rhodesian refugee now in America is fascinated with New Zealand geography
😀
Could the boulder bank be connected in some way to Farewell Spit further along?
No, not connected, but an interesting thought
Still seems fault boundary related to me. However, the conglomerate layer beneath could have additional land or marine slide debris or even pyroclastic flow (ash+debris) from Taupo volcano.
Ok, wild speculation now...Did those eruptions block out the sun for awhile? Long enough for glaciers to compress debris? Was debris taken underground for sometime and compressed a little, then uplifted again by fault movements?
Would eroding of a conglomerate semi-hard base outcrop produce enough material to maintain the bank?
Do wave currents in that area keep material in that zone and on the bank?
What would happen if you dug a ditch as deep as you could across it-would waves make a bigger gap or refill it w debris/shingle?
Lots of interesting questions!
Oh I love a good mystery! Thanks for being forthright with your own musings. I became interested myself after hearing that the boulder bank and Split Apple Rock do not 'seem' to be natural so my girlfriends and I went down a couple of weeks ago to check them out. As NZ history is adamant that Maori were first inhabitants - a hot debate but an accepted rule of thumb, older Maori elders say otherwise - but it is still an anomaly as to the origins of these rock structures considering the amount of work that would have to be undertaken.. I have some more questions if you get a chance to answer, I would appreciate it.
There is also a bank between Pippin Island and North Nelson that you can drive over (Cable Bay?). Is this built from the same boulder sediment, considering that the island itself is the same substance?
Then there is the land bank on the other side of Pippin Island. Is that made of the same rock? Now if that is the case, might that mean there must be a land mass that is no longer visible further out in the Tasman that has disintegrated? Both the Nelson and Pippin Island banks have created safe harbours. There does seem a large amount of boulder rocks residue that has formed from this small portion of land mass, then how has that rock come to 'the surface'? I suspect it is remnants of an ancient upthrust? Considering it is Median Batholith, the number of fault lines with upthrust and it's location, it may have been thrust up further North and ripped apart by the separation from Australian continent. The consideration then would be how it formed into boulder banks from the disintegration.
Now, looking around the global geological earth there are many anomalies in rock structure formation, especially with harder rocks such as granite and andesite being shaped into structures. I have also been made aware of the famous boulder bank between India and Sri Lanka, which has been determined to be artificially made due to the way the layers have been constructed. It is not known who made that either or the one in the UK, but there has obviously been a time when it could be done. We know it was not Maori - it was prior to their arrival.
My only other thinking was a huge tsunami which could have thrust its way into the Tasman Basin, pushing the underwater boulders up and along that coastline. It would have to have been a catastrophic size however. Take into account what it did with the Scablands, near Seattle.
One more query: when looking at a map of Tasman Bay, it appears that all the way around it (and further) there are land banks, even Rabbit Island and Moutere and up much further. There are a large number of them. Is there any commonality in their construction in this area? Ie, why does Tasman Bay have a lot of banks around its shoreline?
Sorry to throw a whole lot of ideas at you!
The land bank on the NE side of Pippin is mostly sand not rock.
@@ronwastney2530thanks for that.
How interesting. A wide area of marine conglomerate debis ranging in size from boulders to pebbles. Roundish, smooth igneous boulders! Which means lots of watery abrasion. This material has been "deposited" but by what & when. The Bluff source? Maybe? I feel this material is very ancient. Much older than 7-10k yrs old! Nelson City geology is a real mix of different rock/sediment "pockets". Maybe the Boulder Bank debris is just a part of this complex? Many questions. Little answers. I say yes to drilling.
Thanks for your thoughts!
I have some almost-ideas bouncing in my head re: Earthquakes, soil liquefaction, landslides, longshore drift and wave action... but this is a doozy, so to speak. Undersea landslides, sea level drop, .. not a full theory here yet, but I see some mechanisms working together that could expose a debris field to wave action.
That is some serious beach ridge! Joke asside, I think is too rounded to consider a proximal source, like the suggested "parallel granodiorite". I would say that this material travelled a bit, if not more than one sedimentary cycle. An earthquake could have vertically sorted this sediment (since in NZ earthquakes are rather common compared to my Brazil), bringing the larger rocks to the surface, just like when you shake a poorly sorted sand. Since we have a muddy matrix underneath this cobble paviment we could be talking about some continental deep channels that got sorted by and subsequent earthquake. Well, that is the beauty of geology; no simple questions and a lot of thinking. Just came across this amanzing youtube channel. Cheers from a fellow geologist!
Thanks for your comment!
Looks like a version of Chesil Beach on the south of England.
It does
Fascinating. My guess it has something to do with the Flaxmore fault that lies parallel to it. The bank seems to trace out a previous coast line if you look at it on google maps satellite image.
Thank you for naming that fault. Now I have seen it, it helps with my theory regarding tectonic uplift/ sinking. That fault seems to end right at the headlands where the rocks seem to originate from.
Have they ever taken one of the large boulders and place it on the smaller, sloped portion of the bank, to see how much or far the waves would move it? Sure, it would be a long term experiment, but would be interesting to see if it moves.
Great idea for an experiment.
Would love to see an Episode in Murchison, theres so much cool geology there like the Thousand Acres, Mt Owen Massif and the Longford Syncline. You can't go on anywhere in the bush without finding interesting things.
Ok I'll add it on to the list...🙂
@@OutThereLearning Awesome! Perhaps the answer lies in the draining tides of the inlet, which would be much stronger than ocean currents and able to transport rocks along a more simply explained sand spit which was formed earlier, the mouth where ships go in is man made, so before that was dug out the currents would have been very strong. I also like the theroy thats its also the top of a ridge of bedrock because the cliff where juts out of the sea is right along the flaxmere fault. As for the rocks falling off and being transported by sea currents, the current is certainly very powerfull going around D'urville island, if you look NIWAs new bathymetry maps there is a deep trough around the northen point which looks the same as a tidal trough that form around rocks at a sandy beach, only its enormous.
Could it be resulting from some type of liquefaction during an extremely large or series of large earthquakes?
I guess the question is how did the uniform rock type get spread over the platform area before being washed up into the ridge. Thanks for watching!
Is it possible that the boulder bank was in fact a boulder beach at point seaward of its current position during the period of glaciation, and bordered an alluvial plane of fine sediments. As sea levels rise or dramatic subduction has occurred, the sea has overtopped the old beach, scouring the loose sediments and creating the harbour in behind the boulder beach thus creating the bank, which over time has migrated towards the current coast.
Thanks for you ideas!
Great video thanks Julian! But speaking for the people of Nelson, no, we don't want a rig out there! Interesting hypothesis though
Surely it would be an iconic landmark...? People might vote to make it permanent no?
It is sometimes said that the people of Ireland and the people of New Zealand have a lot in common...
*>`Huh!‘
The Waimea river mouth used to be close to Rocks road; could a river have had some past impact ? Some people think that the Buller River may have flowed this way at some time in the past, if true there would have been plenty of water force to move things around in big floods.
The rocks can only have come from a granodiorite source - Mackays bluff or another hidden one, but not from the South or East where the rocks are different. Cheers!
@@OutThereLearning Thats the end of that theory then.
What’s the angularity of the clasts? And has anyone managed to relatively date it? My thoughts are an older glacial or periglacial deposit, noting to the fact the source isn’t there anymore and the source is no longer extant.
Thanks for your ideas!
Run seismic lines out from the bank to see what is below
That would be a good way to see what is going on...
To me, it looks mostly like river stones, which have interacted with the sea and have lead to this build up over time. The Tasman Sea is a very powerful thing and the West coast on NZ is populated by many rivers and streams and a couple of glaciers to sea level..
Interesting video all the same, I live in Wellington and didn't even know this Boulder Bank existed. Shame on me :)
Yep - except there are no rivers with those rocks in nearby.
Maybe an ancient river since raging rivers can move large boulders. Or an ancient fault line which moved and took part of the coastline offshore. Or due to a quake/fault line movement part of the ocean floor was pushed up out of the ocean.
0:34 now that's how to express gratitude in NZ. Not sure "Thanks heaps" would work in the UK just yet, at least 'no worries' is extremely common in the UK now.. Love the colonial expressions.
🙂
I have seen anomalous small rock deposits on sandy beaches and on inspection seen they are small rocks transported from kelp beds where the base of the kelp was attached to large stones and arrived on the beach attached to kelp blown ashore by storms and thrown up the beach by wave action.
Just sharing observations, not saying..
does it get and good surf ???
Has anyone taken different sized rocks. marked them in some way so that they could be easily identified and tracked them over time to see how far they moved?
Great question! Not that I am aware of
9:30 way over the other side of the bay i see white cliffs ?
could rocks have travelled from that area by way of prevailing currents and wind ground swells or even layer down in a short time frame by a Huge earthquake wave / tsunami
MY EXPLANATION:
Dawn, Sept 4th, 5021 BC. A suitably large Asteroid, (75% ice, 25% rocks), hurtles out of the North West. it explodes and vaporises 3km above sea level to create the scaffolding for Farewell Spit. (Can you see that Yucatan signature?). The liberated rocky bits continue hurtling Eastward on multiple splayed trajectories.
SOME IMPACTS/EFFECTS:
An anciently established ducted limestone aquifer with undersea exit is punctured on land to form Te Waikoropupu Springs.
Catchment channeling water to Harwood’s Hole is rearranged.
Several clearly conical shaped blast craters on Takaka hill top.
Arc of Meteorites create Nelson Boulder Bank *(see ahead).
Impacts in central and western Tasman Bay produce massive Tsunamis that: (1) Overwhelm and modify the Waimea and Monterey estuaries to have multiple exits to the sea. (98% of NZ coastal estuarine systems have just one exit to the sea. Notable exceptions,are Waimea, Monterey and Tauranga Harbour). (2) Divert the Motueka River from flowing into Monterey estuary.
Close duel impacts on western flank of Mt Jackson (“ The Cliffs”), Grenville Harbour, D’Urville Island.
Obvious, (many clues), impact crater(s) in Croisilles Harbour.
Most easterly impacts? Perhaps the seafloor straight line crater salvo offshore of Blenheim.
* BOULDER BANK CREATION MECHANISM:
(1) A 13km arc of equally spaced meteors impact Tasman Bay offshore at an angle and roughly parallel to the eastern coastline. A line of truly massive explosions ensue. Each explosion radiates wave energy via air and water with an easterly bias inshore. After a certain distance these waves crowd shoulders and amalgamate to form a continuous long arc wave front. Slight variations in this process are ultimately manifested as slight meanderings of the Boulder Bank.
(2) Lighter mud bound seabed material is propelled eastward by blasted out gases. It lands and forms an un-compacted seafloor layer to near inshore.
(3) “Kinetically” propelled rocks and large boulders travelling slower and higher, now land and overlay the lighter material. This creates a seafloor boulder field that extends a fair way back out to sea. The “boulders” in this field range from small to very large. This field terminates abruptly to form the inshore extremity of a new continuous under water reef. This is due to ballistic sorting. All the boulders at this distinct terminal will have the same mass.
(4) The impact explosions also create and propel eastward, large slow moving sea surface waves and fast moving sub-surface displacement (Tsunami) waves. On encountering the shallowing sea depth over the new seabed boulder field, the initial tsunami wave dramatically slows and builds to a huge sea surface wave. The initial large sea surface wave now catches up and they combine to form a massively tall wave. In an act of hydraulic sorting, this Mega wave gathers up and retains smaller rocks and debris scattered amongst the new seafloor boulder field.
(5) The impact explosions have created massive voids in the sea and seabed. Water is drawn back from east and west to fill these voids. This draw back negates any explosion generated water wave it encounters.
(6) The advancing eastern extremity of the draw back arrives on the seaward side of our Mega wave just as it encounters the sudden step depth increase over the inshore terminal of the new reef. Both events contrive to halt our increasingly unstable Mega wave from cresting and breaking. Instead our Mega wave totters and collapses. It dumps its massive debris load on top of the new reef to produce the high tide exposure seen today as theNelson Boulder Bank.
There you go, just some of the complex physics unfolding. C.O’R.
Montere, not Monterey, thanks spell check!
Mate, that is the most awesome scenario ever! It's bound to be the Answer!!
Amazing! Thank you!
Or is the of the remains if a band of hard rock and the soil rock behind the boulder bank eroded from the land leaving it too remain
Thanks for having a think about the puzzle, and your idea!
Are the boulders different to the geology of the immediate surrounding mountains & is that why it's a mystery? Otherwise wouldn't these boulders just be deposited from mountain erosion, down through the Wairoa River for eg, & the boulder bank is just a spit in front of an estury the same way that Kaitorete Spit at Birdlings Flat is a spit or "Boulder bank" in front of Lake Elesmere, which in the not too distant history was the outflow for the Waimakariri River.. Are they not similar or are the rocks of Nelson Boulder bank completely different to the rocks of the surrounding mountains? Looking at some of the rocks they look very similar to those of Karamea, of which the surrounding mountains are made up of alot of sandstone/limestone, albeit with not as much quartz limestone as the Takaka Hills. But to my very amateur knowledge, mostly from observation in the various areas, of huge quartz boulders, & the presence of many limestone caves, that whole Tasman/Karamea area is made up of limestone/sandstone, as opposed to the Greywacke of the majority of South Island mountains. I would assume that the surrounding seaward mountains behind Nelson, are made up of the same stuff as Takaka/Tasman/Karamea region, or are they part of the Marlborough Fault Zone, meaning Greywacke? If there's no similarity between the boulders & surrounding seaward mountains, then there's no mystery, it's just a simple spit bordering an estuary on an alluvial plain. If there's no connection to any surrounding geology then yes, maybe there's an outcrop of similar rocks in the bay.. Crowdfund ready set Go! ;)
Sloshback deposits? Im thinking along the lines of randall carlson
Homogeneity factor, the reason nothing behind is because everything was destroyed?
All the deposits were put down at once, then carved out by the returning waters?
Is it the ' cast' of a glacial esker? - choked up with sediment post ice age?
No glaciers came down to this level
You mentioned that it would be useful from the point of view of shedding light on the boulder bank's origins to be able to sink maybe a half a dozen drill holes - but that the cost, essentially, would be prohibitive. I was surprised you didn't mention the enormous known ( _well..._ 'strongly suspected') Nelson hydrocarbon reserves. Yah - _‘OIL!’_ Yes, Oil. Oh, _everyone_ knows about the oil. And the gas. Open secret in both the geological and the oil exploration communities. Common subject of discourse amongst the dogs on the street.× "Load$amoneyyy!" as a famous British comedian was wont to say in the late 80's. Nelson could be the next Stavanger, Norway, or Aberdeen, Scotland. In such a situation, revealing the secrets of the Boulder Bank would be, in money terms, like a Russian oligarch throwing a few kopecks to a tramp.
Of course, you will always have those people who seem to have an antipathy to money. Usually because they have never known the want of it. We call these people NIMBY's×× Rather than Stavanger and Aberdeen, they would probably point to Dampier and Hedland. Forgetting that those are ports that handle _Dirt._ Which is entirely different stuff.
×May be subject to confirmation. Or, put another way, "You're gonna hafta drill!"
××NIMBY - "Not In My Back Yard"
Thanks for your comment!
And how does gold wash up with black sand onto their beaches?
Onto the surface of the beach may I point out.
i'd give money to that crowd fund :)
Good on you!
"Aliens put it there" said the cook.
:-)
Maybe the ocean levels were lower.
And the Waves a lot higher at some point in the past.
Just saying.
Cheers
🇭🇲👍🍻🍻
Cheers back!
I didn't get why it couldn't be glacial moraine.
There is no evidence of glaciation at this low altitude in the area, only up in the mountains
@@OutThereLearning if it was formed 10,000 years ago, that would have been the height of the last ice age, surely there were glaciers here at that time.
I look at all that driftwood and wonder if some of the boulders aren't moving around like vikings moving a longship! I suppose there's no one stupid enough to be filming underwater during a storm surge?
Not that I know of!
Aliens mate 👽
:-)
..has the boulder bank been dated?..(biological materials in the underlying muds) .keeping in mind that @ 14,000 ya, sea levels were @ 130m lower than today..
Mystery is very important for humans. It's been driving their wild imaginations throughout history. It created 'the gods' and all the stories associated with them, including the Greek pantheon, and all the Western literature classics which followed therefrom. Not knowing, motivated European people to seek, discover and understand everything and everything. Now, you can look at every square metre of the planet from a satellite. Unavoidable. Has many advantages. But a bit sad in other ways.
Very in interesting thought. Luckily there is still mystery all around us still and I believe there always will be
Goddamit!!! I’m not going to be able to sleep till this mystery is solved!!!
Aliens???
Your not the first to make that suggestion!
Man made by ancient civilisation , not by latest settlers .
Thanks for your idea
Why can't it be an ancient river bank?
Nevermind re: my comments on the 2 other vids :)
On the original video I was going to suggest perhaps it was onetime a giant 'beached' iceberg during a cold period that washed back'n'forth against the Boulder Bank outcrop and pushed it's rubble into that form over many tens of years. A bit like a floor-mill grinding stone. The pebbles are then smoothed from the ocean wash.
All these videos are outstanding and Jacinda should appoint you to the Tourism NZ board. :)
Haha thanks!
I think you people need to speak (Korero ) to the Indigenous peoples of this particular area and you will get the knowledge of the area you are researching
Thank you for your comment
Why bother saying Kiora if you aren't going to do the video in moari?
Kaimanwa Wall New Zealand would be a cheaper option to crowd source fund the project of discovery by association to this and many other features around this ancient country and it's history that has been halted at 1200AD. Coming back here after 30 years New Zealand you have lost your way. Find it in Truth
oh great we don't know what it is, let's frack it up🤦🏾♂️🤦🏾♂️🤦🏾♂️
Yep - sometimes it is nice not to know everything!
So he immediately discredits the fact that it’s not man made because there are paintings of it here when Pakeha arrived and that Maori wouldn’t have had the know how! Besides the obvious arrogant dismissal of Maori technology he assumes no humans were here prior to Maori which I find amusing!
Yes those are assumptions, true. Thanks for watching and commenting
I am an expert and I say is man made.
Foundations prove this. Your expert failed to mention the obvious foundations of the structure.
.... and its utility.
Did this video come about because of the 'split apple rock- ancient solar observatory' video which starts off comparing the man-made nelson boulder bank to the highly similar man-made Adams Bridge. It brings into question the historical narritive being stuck to like glue by all the academics in NZ because their funding comes from the government. There is also a video called "poukawa revisited" which had all of the highest qualified scientists in NZ, along with the DSIR and Radio carbon dating laboratory which proves beyond doubt that NZ has been occupied more than 7000 years. there is even further evidence where radio carbon dating of human occupation material has been found over 10,000 years at Oturehua Quarry in the south island. Now lets have that discussion and stop telling us that the Nelson boulder bank isn't man made just because you say so.. It is obviously man-made, it has been built with a structure of largest boulders on the bottom and gradiates up to the smallest stones, this is not natural... how about discuss why it is that there is absolutely no Granite found on the foreshore of the waters edge of Nelson waters edge?? it is only found on the boulder bank, so there goes your sea drift theory. How about you tell the public about the ancient Granite quarries that are found in Nelson.. How about you tell the public that there are ancient records that speak of the extensive modification of the coastline of the northern south island. What is worse is within the first 5 minutes you relieve us of the possibility that the nelson boulder bank is man-made, with no scientific evidence, or proof .. just your opinion. you should be ashamed of yourself, this is not scientific and we will put you into the same category as the rest of the scientists in NZ as sadly paid sellouts!
Smiling. Maori weren't the first. Moriori were before them. And others before ?. If you're Government employed; then possibly you don't want to know; and wont answer that question. I cite their suppression of data and knowledge that even Auckland has evidence of being surveyed in ancient times (placed survey rocks). Check out the Kimanawa Wall. There's an agenda; and these things evidently don't fit with that. Regards who built the bank. If it were a crime; then an investigator would not dismiss it due to the "impossibility" of intelligent causation. It looks like a harbour protectorate.
I am not government employed :-)
I'm glad you bought up the wall. It always comes up in discussions about Easter Island and Peru. I follow Brien Foerster and would love to spend a couple of years doing his tours to all these ancient structures.
Funny how you said the Maori didn't have the tech... 🤣🤣🤣🤣🤣🤣that's so funny.. have you not seen the buildings n boats they built...n their Easter island cousins n so on so on.. that was a real wrong statement..
Thanks for watching and for your comment
Did he really imply that it couldn't be man made because it was already there in 1841? So there were no humans there prior to 1841? Prior to the pakeha arriving there were no humans there? The Māori weren't capable of moving rocks?
I'm not sure if this is a logical fallacy or if the dude is actually racist. I'm not sure if the Māori have ever built anything like that, but I'm pretty sure they would have had the capability to if they wanted to.
Point taken thank you!
Why doe he ask such dum questions??
No idea 😀
Yeah humans didn't build anything before 1841.
Fact 🤣
I think it is fair to say there is no evidence that this huge feature has been made by humans. To propose that it was constructed by a vast population of workers who trekked many kilometers up and down shifting billions of tons of rock for some unknown purpose and left no trace of their tools or artifacts does seem to defy reasonable logic.