1. Geology of northern Penobscot Bay, Maine Yale Public content 1998. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by U.S. Geological Survey Information Services. English. Public. Maine, Penobscot Bay Region, and Penobscot Bay Region (Me.).