U.S. Geological Survey Geologic Investigations Series I–2677
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.
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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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 https://pubs.usgs.gov/imap/i2677/.