Deep Pit Quarry (Rockport Granite Company)
Deep Pit Quarry, Gloucester, Essex County, Massachusetts, USA
"Deep pit granite quarry, near Bay View, Rockport, looking north, showing in upper part thick faulted dike of hornblende diabase, cut along fault plane by a thin dike of lampropyre without biotite, reaching to bottom at left; also, in center below an irregular injection of hornblende diabase. Some of the joints are parallel to the thick dike." ...