Phosphate deposits in northern Alaska

Abstract

Deposits of sedimentary phosphate rock were discovered on the Arctic Slope of Alaska during the geologic investigation of Naval Petroleum Reserve No. 4 between 1944 and They occur in at least two stratigraphic units, the Lisburne group (Mississippian) and the Shublik formation (Triassic), and have been found at widely scattered localities along the north front of the Brooks Range and in the adjoining foothills. The deposits in the Lisburne group in the central Brooks Range and Arctic foothills are of principal interest and have been examined in detail and systematically sampled at two localities, Tiglukpuk Creek and upper Kiruktagiak River.