1. Sedimentary Rock

2. Sedimentary rock is…
Formed by compacting layers of sediment and cementing them together with minerals
Sediments are formed from weathering and erosion

3. 3 Classifications
Clastic
Chemical
Organic

4. Clastic Sedimentary
Made of small, medium or large sediments.

5. Large Fragment Clastic
Conglomerate
Rounded edges
Breccia
Sharp edged

6. This is a sample of breccia, a coarse-grained sedimentary rock with coarse, angular fragments. Compare the grain sizes to the centimeter scale.

7. Medium and Small Clastic
Sandstone
Small particles
Shale
Clay size particles
Flaky

8. This is a sample of sandstone, a sedimentary rock that formed from sand grains in a matrix of very fine-grained silt, clay, or other materials. The grains in this sample are mostly the feldspar and quartz minerals, which probably accumulated near the granite from which they were eroded.

9. Chemical Sedimentary Rock…
Is formed from minerals that are dissolved in water
Minerals can precipitate out
Minerals can be left when water evaporates

10. Chemical Sedimentary
Halite
Limestone

11. This is a sample of limestone, a sedimentary rock made of calcium carbonate that formed under water directly or indirectly from the actions of plants and animals. This fine-grained limestone formed indirectly from the remains of tiny marine organisms.

12. Organic Sedimentary Made from once living things Carbon based
For example
Limestone (organic)
Chalk
Coal

13. To identify Sedimentary Rock…
Look for these features…

14. Layered look

15. Ripple marks

16. Mud cracks

17. Fossils

18. Concretions such as geodes