The grain size of plagioclase laths in this porphyritic basalt ranges continuously from the groundmass microlites to milimetric phenocrysts. Glass and sparse equant pyroxenes comprise the remainder of the groundmass. Clinopyroxene phenocrysts are patchy due to plucking.
The author has given permission for this work to be deposited in the Digital Archive of Colorado College.
The author has given permission for this work to be deposited in the Digital Archive of Colorado College.
