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.TOURING

COLORADO GEOLOGY

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SEDIMENTARY ROCKS

Minerals        Igneous         Sedimentary         Metamorphic         Fossils
CLASTIC CHEMICAL ORGANIC

Conglomerate
 rock composed of generally rounded pebble-sized clasts cemented together by a finer material		 Limestone
 rock consisting primarily of calcite

Coal
 rock composed of consolidated plant material
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Sandstone
 rock composed predominately of sand size (1/16 - 2 mm) particles		 Dolostone
rock consisting primarily of dolomite

Chalk
rock consisting primarily of coccolithophores
 

Siltstone
 rock composed predominately of silt size (1/256 - 1/16 mm) particles

 Gyprock
 rock composed of the mineral gypsum		 crinoidal limestone.JPG (121661 bytes)
Limestone
 rock consisting primarily of calcite
Mudstone
 rock composed predominately of silt and clay size particles		 Rock Salt
rock composed of the mineral halite

Diatomite
rock consisting primarily of diatoms
Claystone
rock composed predominately of clay size (<1/256 mm) particles

Chert
rock composed of amorphous silica

  
Shale
 rock composed predominately of clay with some silt and exhibiting layering.		    
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