ROCK GROUP

DESCRIPTION: Broad classification of geological units based on rock type.

Valid entries:

agglomerate
alkali feldspar granite
alternating sandstone/mudstone
alternating sandstone/siltstone
amphibolite
andesite
argillite
ash
basalt
breccia
broken formation
cataclasite
chert
conglomerate
dacite
diorite
dolerite
fill
gabbro
gabbronorite
gneiss
granite
granodiorite
granulite
gravel
greenschist
greywacke
hornfels
ignimbrite
limestone
loess
marble
melange
metaplutonic
metasediment
metavolcanic
migmatite
monzodiorite
monzonite
mud
mudstone
mylonite
orthogneiss
paragneiss
peat
peridotite
pyroxenite
quartzite
rhyolite
sand
sandstone
schist
scoria
semischist
serpentinite
silt
siltstone
shale
syenite
tonalite
tuff
unknown

Addition of ? (e.g. ?tonalite) indicates uncertainty of value