GLGY 201 - Clastic Sedimentary Rocks

feldspathic arenite

full name: medium grained feldspathic arenite

medium grained, moderately sorted

pinkish colour of clasts are often an indication of feldspar grains.

quartz arenite

full name: coarse grained quartz arenite

coarse grained, well sorted

lithic arenite

medium grained lithic arenite

medium grained, well sorted

mudstone

full name: mudstone

very soft rock, feels smooth

breccia

full size: pebble breccia

pebble sized grains, poorly sorted

very angular clasts, mixed composition, immature rock, poorly sorted

conglomerate

full name: pebble conglomerate

pebble sized grains, poorly sorted

rounded clasts

very mixed composition

immature rock

poorly sorted

shale (full name)

clay sized grains, fissile

very soft rock

flat, thinly layered rock

siltstone (full name)

silt sized grains, very well sorted

very soft rock

looks similar to mudstone but feels grittier because of larger silt grains