1. Paleocurrent maps for the Upper Devonian and Lower Mississippian Endicott Group, Brooks Range, Alaska [cartographic material] Yale Public content 1980. 2002-06-01T04:00:00Z. 2023-01-06T04:04:24Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Alaska and Alaska. Paleozoic, Devonian, Mississippian, and From 230 to 570 million years ago.