"Gary K. benson"

Dark gray, composed mostly of pyroxene and olivine.

Coarse-grained plagioclase and pyroxene with some olivine.

Dark gray, with hornblende as the dominant mafic mineral.

Fine to medium-grained with biotite.

Medium-grained with biotite.

Gray-to-brown basaltic, with over 50% vesicles.

Abundant small black phenocrysts in a gray to brown matrix.

Coarse-grained, with microcline, biotite and horblende phenocrysts.

Classic, very coarse-grained igneous texture.

Light gray, with flow structure.

Gray andesite with phenocrysts of felspar and/or hornblende.