Paleo-tech stone mortar for nut grinding

I chose a limestone block because it's soft. I ground down the top surface of the limestone to be level with a flat-bottomed piece of sandstone, using river sand as grit in between. I intermittently tipped it over to knock off debris and washed off the debris with water and a grass brush. I then gradually pecked out the bowl using various cobbles of hard chert and quartzite. I finished the bowl's inner surface with cobbles of sandstone with more sand grit, and a final smoothing with a quartz cobble. It took about 3-4 hours, start to finish.
#ethnomineralogy #paleotech #primitiveskills #survival #primitivetechnology

[@alm_alb]

I love the work, but I guess I’m confused on what ms happening and what each step’s function or reason is.
Keep up the great work!

[@PaleoForaging]

You're right; I should explain better in the description at least. I chose a limestone block because it's soft. I ground down the top surface of the limestone to be level with a flat-bottomed piece of sandstone, using river sand as grit in between. I intermittently tipped it over to knock off debris and washed off the debris with water and a grass brush. I then gradually pecked out the bowl using various cobbles of hard chert and quartzite. I finished the bowl's inner surface with cobbles of sandstone with more sand grit, and a final smoothing with a quartz cobble.

[@fookingsog]

Nicely Done!!! 💯 A couple of Questions... Is it made out of "Sandstone"? ...What was your total elapsed time from start to finish? Thanks!

[@PaleoForaging]

@@fookingsog It’s limestone, with tools made of chert, quartz, sandstone, sand, and water. It took 3-4 hours of continuous work, and another 30 mins to choose and gather the rocks.