Reconnaissance geologic map of the Noatak C5, D5, D6, and D7 quadrangles, Alaska

This map covers the northwestern part of the Noatak 1:250,000-scale quadrangle (fig. 1, sheet 1). The area has low topographic relief that largely consists of gently sloping hills separated by broad expanses of tundra growing on unconsolidated surficial materials. Elevations range from sea level up to 475 m (1,456 ft.) at Mount Jarvis. Study of bedrock geology is constrained by a scarcity of exposures in most areas. Most hill tops are rubble-covered, and there are only a few stream outcrops. As a result many of the stratigraphic and structural relationships between rock units are inferred from similar relationships previously determined in other areas of the western Brooks Range where the rocks are better exposed (Curtis and others, 1982, 1983; Ellersieck and others, 1982, 1983; and Mayfield and others, 1982, 1983 a, b).