Those quarries produced roofing shale, light weight aggregate, and various materials for brick making. The Antietam Formation  also had a minor economic importance, particularly from 1945 up until 1966.
The quarries supplied roofing shale, light-weight aggregates, and other materials needed for brick production. The Antietam Formation was economically significant, though not extensively so, especially during the period from 1945 to 1966.