Sedimentary Rock Table

CLASTIC DIVISION SEDIMENTARY ROCK

TEXTURE DESCRIPTION

ROCK NAME

COMPOSITION

energy of deposition

coarse

conglomerate

rounded fragments of rocks; quartz

high

breccia

angular fragments of rocks; quartz

high

medium

sandstone

quartz

medium

fine

siltstone

quartz and clay minerals

low

very fine

shale

quartz and clay minerals

low

CHEMICAL-ORGANIC DIVISION SEDIMENTARY ROCKS

TEXTURE DESCRIPTION

ROCK NAME

COMPOSITION

crystalline--medium to coarse sized

crystalline limestone

calcite (CaCO3)

fossiliferous--abundant fossils in calcarious matrix

fossiliferous limestone

fossiliferous--altered plant remains

bituminous coal

carbon

fossiliferous--microscopic sea organisms

diatomite

quartz

crystalline--microscopic crystals formed by precipitation

chert

quartz