GEO 303 Sedimentary Rocks

arkose

• clastic (sand-sized)

• quartz and feldspar

• rich in orthoclase feldspar

siltstone

• clastic (silt)

• quartz, feldspar, calcite

• fine and gritty

quartz sandstone

• clastic (sand)

• 100% quartz

conglomerate

• clastic

• coarse rounded grains

• poor sorting

• 50% quartz & 50% calcite

rock gypsum

• chemical

• white/clear, and salt

• evaporate material

• gypsum

breccia

• clastic

• coarse angular grains

• poor sorting

• quartz, feldspar, calcite

rock salt

• chemical

• gray, glass, & grainy

• evaporate material

• halite

coal

• organic

• black & sooty

shale

• clastic (silt)

• quartz, mica

• fine and smooth

limestone

• biochemical

• calcite

chert

• biochemical

• silica

• conchoidal fracture

coquina

• chemical

• calcite

• hash of shells

clastic

made up of clasts (grains) and cement (calcite, quartz, or hematite)

chemical`

made of chemical/evaporite sediments

clay

very fine-grained

silt

fine-grained

sand

medium-grained

gravel

coarse-grained

rounded clasts

edges of clasts rounded

angular clasts

edges of clasts angled