STRATUM and STRATIGRAPHY (by Mrs. Ruault-Djerrab)

This video begins by defining what stratigraphy is and what a stratum is, then gives some important information regarding strata (what type of rock are strata found in? how thick are they? what are the boundaries ?...)
This video was posted online for beginner students in geology, particularly in License 1 and 2 at the University, or for high school students in scientific fields. It allows you to revise the concepts seen in class or in Stratigraphy tutorials.
Video highlights:
- 0:07: Definitions
From 0:57: Presentation of important information
- 1:01: What rocks are affected (by the presence of strata)?
- 1:26: Are all sedimentary rocks stratified?
- 1:55: Can igneous or metamorphic rocks be stratified?
- 2:25: How thick is a stratum?
- 2:47: What are the boundaries of a stratum?
- 3:28: How to recognize the lower and upper limits?
- 4:38: What are the visible changes between two strata?
- 5:12: What are the parameters responsible for these changes?
For more details on sedimentary geology, consult the site: djerrab-geologi...
Photo reference:
The photos presented in this video are personal photos, with the exception of:
- Chalonnes cinerite photo at 2:15:
Arlette1, CC BY-SA 4.0 creativecommon..., via Wikimedia Commons
- Tillite at 1:50:
Coleman Member, Gowganda Formation, Paleoproterozoic, 2.3 Ga; Straight Lake West roadcut, north of Temagami, Ontario, Canada" 24 by James St. John is licensed under CC BY 2.0.
To see all the photos featured in my videos (and more), check out my photo site: adjerrab.wixsi...
Note: In this video, some important terms have been translated into English (pale blue color)

[@nicolaslhomme2117]

MERCI

[@nassernassem2326]

🙏🙏

[@enageogeotech6905]

Peut on dire calcaire marneux ,marne calcaire , marne argileuse ou argile marneuse ?
On dit que ces appellations sont impropres !.
Merci de me répondre et surtout merci bcp MMe pour vos vidéos très instructives .

[@tpgeologie]

Bonsoir. Les noms que j'utilise sont des noms d'usage courant (qu'on retrouve par exemple dans la légende des cartes géologiques), mais effectivement certains ne sont pas formels.