Browse Items (1651 total)

basic

massive, tabular, sharp-edged blocks

possibly crystal tuff

fine grained, light gray

medium grained, dark grey, biotite-hornblende granodiorite

medium grained, light gray

coarse grained, medium gray

medium grained, medium gray w/ pinkish tint

coarse grained, light gray

coarse grained, light gray biotite-hornblende

intrusive

porphyritic, light gray, fine grained

fine grained, dark gray, porphyritic

iron-stained

coarse grained, light gray, biotite-hornblende

ignimbrite layer in a welded tuff