1. Sedimentary Rocks

2. Formation
Compacted and Cemented sediments from pre-existing rocks or organisms

3. Three Types
Clastic - Composed of sediments (rock particles -silt, sand, pebbles, etc)
Size of sediments tells a lot about the depositional environment

5. Intertidal and/or rivers
Sandstone

6. Shorelines/silt to sandy marine environments
Sandstone
Siltstone

7. Middle of ocean basins
Shales

8. 2. Non-Clastic Sedimentary Rocks
a. Crystalline - Minerals left behind from the evaporation of water (evaporites) or water sample if full with dissolved minerals and they “fall” out of water and create a rock (precipitates)
Dolostone

9. 2. Non-Clastic Sedimentary Rocks
b. Bioclastic - Cemented organic remains (shell fragments, decayed plants)
Swamps, bogs buried plant material with lack of oxygen prevents decomposition of organic matter
Shallow marine environments

10. Identification Texture – clastic, crystalline or bio-clastic
Grain Size – size of the rock particles
Composition – What is the rock made of?

11. Texture
A. Clastic – whether or not the rock is composed of broken fragments of pre-existing rock (pebbles, sand, silt or clay)
B. Non-clastic – no individual fragments, except perhaps pieces of shells distinguished by mineral content i. crystalline ii. bioclastic

12. Grain Size
Size of the rock sediments
Pebbles, sand, silt or clay

13. Composition
What is it made of?

14. HOW DO YOU KNOW IT’S A SEDIMENTARY ROCK
It has:
1. Layers

15. It has:
2. Fossils

16. It has:
3. Compacted rock particles/sediments

17. ESRT Page 7