sedimentary rock
Chemical precipitates include some limestones and evaporated deposits such as gypsum and halite (rock salt). Coal, oil shale, and limestone made of fossil material are examples of organic sedimentary rocks.
Most sedimentary rocks show distinct layering (stratification), because they are originally deposited as more or less horizontal layers.
© RM 2012. Helicon Publishing is division of RM.
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