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U.S. Geological Survey Geologic Investigations Series I–2677

Geologic Map of the Nulato Quadrangle, West-Central Alaska

By W.W. Patton Jr. and E.J. Moll-Stalcup



The Nulato quadrangle encompasses approximately 17,000 km2 (6,500 mi2) of west-central Alaska within the Yukon River drainage basin. The quadrangle straddles two major geologic features—the Yukon–Koyukuk sedimentary basin, a huge triangle-shaped Cretaceous depression that stretches across western Alaska from the Brooks Range to the Yukon delta; and the Ruby geanticline, a broad uplift of pre-Cretaceous rocks that borders the Yukon–Koyukuk basin on the southeast. The Kaltag Fault crosses the quadrangle diagonally from north-east to southwest and dextrally offsets all major geologic features as much as 130 km.

thumbnail of map

Last modified March 21, 2012
First posted October 4, 2000

For additional information contact:
Alaska Science Center staff
U.S. Geological Survey
4210 University Dr.
Anchorage, AK 99508
Alaska Mineral Resources
Alaska Science Center

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Suggested citation:

Patton, W.W., Jr., and Moll-Stalcup, E.J., 2000, Geologic map of the Nulato quadrangle, west-central Alaska: U.S. Geological Survey Geologic Investigations Series I–2677, available at

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