Sedimentary Rocks

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Sedimentary Rocks
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• Made from sediments or rock material that has
  been broken down in some way.
• Sedimentary rocks are usually formed in a watery
  environment.
• Often layered
• Are the only rocks that contain fossils

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Types of Sedimentary Rocks

• Clastic (fragmental) made by compaction and
  cementation of sediments.
• Clastic rocks are identified by the size of the
  fragments.

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Mixed
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Conglomerate has rounded fragments
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Breccia has angular fragments
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Chemically formed rocks evaporites

• Formed when water carrying minerals evaporates
  and leaves the minerals behind.
• Are identified by the minerals present (ie halite
  hardness of 2.5)

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• Bioclastic-
• bio life
• clastic fragments
• Made from accumulated shells (limestone) or
  plants (coal)

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