1. Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains--northeastern states, the Great Lakes, and parts of southern Ontario and the Atlantic offshore area (east of 80⁰31ʹ west longitude) Yale Public content 1993. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Northeastern States. Quaternary.