1. SEDIMENTARY ROCKS

2. Sedimentary Rocks
Rocks the form from other rocks that have been weathered.

3. How are sedimentary rocks formed?
Sedimentary rocks are formed through:
Erosion
Deposition
Compaction
Cementation
…At the earth’s surface usually from other rocks.

4. How are sedimentary rocks formed?
Step one is:
Erosion of elevated land such as mountains

5. How are sedimentary rocks formed?
Step two is:
Deposition of the eroded material

6. How are sedimentary rocks formed?
Step three is:
Compaction of buried sediment over time

7. How are sedimentary rocks formed?
Step four is:
Cementation of the particles into a solid rock
Many times sand is the glue!

8. What do sedimentary rocks look like?
Three types of sedimentary rocks
1.Clastic - sediments cemented together
2.Bioclastic - organic material (fossils)
3.Crystalline – Nonclastic (chemical)
- Deposited by chemical precipitation of minerals in sea water. (salt in water)

9. What do sedimentary rocks look like?
Clastic rocks are made of particles cemented together such as:
Clay - shale
Silt - siltstone
Sand - sandstone
Pebbles - conglomerate

10. What do sedimentary rocks look like?
Clay/silt
sand
sandstone
shale

11. What do sedimentary rocks look like?
Crystalline rocks are pure cement such as:
Rock salt
Rock gypsum
Limestone (has fossils)

12. Crystalline rocks formation
These rocks from evaporation of sea water and chemical precipitation.

13. What do sedimentary rocks look like?
Biological (bioclastic) rocks are formed through organic remains such as:
Coal
Limestone (has fossils)

14. What do characteristics tell us about the rock?
Grain size is evidence of environment where rock formed
Fossils give clues to past life and climate

15. What do characteristics tell us about the rock?

16. What do characteristics tell us about the rock?

17. What are sedimentary rocks used for?

18. Steps to ID a Sedimentary Rock
Texture
Clasitc, Crystalline or Bioclastic
Grain size
Composition
What it looks like
Fossils? Other features like ripple marks?
Acid test