Stratigraphy and structure of the Southern Foothills section between the Etivluk and Kiligwa Rivers, Alaska, 1951

The part of the Southern Foothills section, Arctic foothills province, that lies between the Etivluk and Kiligwa Rivers was investigated by Navy Oil Unit party 6 during the 1950 field season. A belt about 16 miles wide and 60 miles long (approximately 800 square miles) was mapped in considerable detail (see index map, pl. 1). The mapped area is in the west-central part of the Arctic Foothills province, wholly within the boundaries of Naval Petroleum Reserve No. 4. Major drainage consists of the middle reaches of the Etivluk, Ipnavik, Kuna and Kiligwa Rivers.

Principal objectives of the party, using previous geologic studies in the Okpikruak-Kiruktagiak Rivers area as an initial working base, were stratigraphic and structural studies of the outcrops in the interstream areas. In view of the former interest in possible Lisburne limestone plays, the Lisburne Ridge west of the Etivluk River and the northward nosing of the Triassic complex between the Ipnavik and Kuna Rivers were designated as areas for particular emphasis.