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Sedimentary Rocks Rocks that are formed in flat layers called strata.

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Presentation on theme: "Sedimentary Rocks Rocks that are formed in flat layers called strata."— Presentation transcript:

1 Sedimentary Rocks Rocks that are formed in flat layers called strata

2 Sedimentary Rocks Can Be Divided into Three Categories

3 CLASTIC SEDIMENTARY ROCK When sediments are deposited, they settle to the bottom based on particle size. This is called stratification. These layers are called strata.

4 Classification of Clastic Rocks Clastic sedimentary rocks are not classified by mineral composition They are classified by the SIZE and SHAPE of the particles of sediment

5 Compaction and Cementation As layers build up, the particles get pressed together. Water is squeezed out and the particles are cemented together by minerals

6 Clastic Sedimentary Rocks Examples Shale – Made of mud and silt particles – Often breaks off in flat sheets

7 Clastic Sedimentary Rocks Examples Sandstone – Made of sand particles cemented together – Different colors based on type sand particles

8 Clastic Sedimentary Rocks Examples Conglomerate – Made of pebbles or rounded stones – Looks like natural concrete

9 Organic Sedimentary Rocks Formed from the remains of living things – Shells of sea creatures – Dinosaur/ancient creature remains – Decayed plant material

10 Organic Sedimentary Rock Examples Bituminous Coal – Made from the remains of decayed plant material – Used as a fossil fuel mostly for making electricity

11 Fossiliferous Limestone Formed from the remains of sea creatures cemented together Contains the mineral calcite (calcium carbonate)

12 Organic Sedimentary Rock Examples Chalk – Made from the remains of microscopic organisms – First used on chalkboards

13 Chemical Sedimentary Rocks Formed from dissolved minerals in water When water evaporates, the minerals are left behind and crystallize Most common places to find this: – Where ancient seas evaporated – Caves

14 Chemical Sedimentary Rock Examples Limestone – Contains calcite – Can form stalactites and stalagmites in caves

15 Chemical Sedimentary Rock Examples Halite – also known as rock salt – Forms when ocean water evaporates


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