East of South Range, SW SW SW sec. Keweenawan basaltic lava flows. Flow top structures visible.
Minerals mostly fill amygdules, or are found in veins and along faults.
Augite - in groundmass, also as phenocrysts. Largely replaced by epidote and chlorite. Calcite - white cleavable massive. Chalcopyrite - massive, brassy to slightly iridescent. Epidote - abundant as crystals in amygdules, also massive replacement of primary minerals in the basalt groundmass.