Chemical & Organic Sedimentary Rocks(Names based primarily on

composition)Basic Rock Name• Limestone• Dolostone• Chert• Rock Salt• Rock Gypsum• Peat or Coal

Composition• Calcite• Dolomite• Quartz (silica)• Halite• Gypsum• “Carbon” / Plant Remains

Limestone

CrystallineLimestone

Chalk

Fossiliferous Limestone

Formation of Limestone

Calcite Precipitates inWarm WaterWater Under Low Pressure (Shallow)

Or

It is secreted by biological organismsClams, Mussels, Scallops, etc.CoralsForaminifera

Limestone Represents:

Shallow Tropical Ocean

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Black Sea

Oolitic Limestone

Travertine(Limestone

)

Dolostone

Chert (Flint, Jasper, Agate…)

Diatom Skeletons

Chert Represents

Deep Ocean

Evaporites:Bonneville Salt Flats, Utah

RockGypsum

Rock Salt

Mediterranean

Geology

Isolated,Arid,Salty

Sea/Lake

Peat and Coal

Swamp, Bog