Sedimentary rocks are formed three ways.


1.    Particles of weathered rocks or sediments compact to form solid rock-- detrital formation.


Shale, Siltstone, Sandstone, Breccia are examples of detrital sedimentary rocks.

2.    Dissolved minerals precipitating out and forming solid rock -- chemical formation.


Travertine and Coal, are examples of chemical sedimentary rocks.

  1. 3.   Sediment derived by biological processes that compacted forming solid rock -- Biogenic formation.


Fossils are found in sedimentary rocks.




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Limestone, Biogenic Chert, and diatomite are examples of biogenic sedimentary rocks