U.S. Geological Survey
Geologic Investigations Series I-2677
Online version 1.0
View over Nulato on the Yukon River towards Notakok Mountain and the Seward Peninsula to the west. Cretaceous sandstone and shale deltaic sedimentary rocks of the Yukon-Koyukuk Basin make up the hills behind the community of Nulato (lower center).
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 northeast to southwest and dextrally offsets all major geologic features as much as 130 km.
i2677map.ps: PostScript file of map sheet for plotting (34.5 MB)
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Michael Diggles
Created: October 4, 2000 (cad)
Updated: June 22, 2007 (bwr, mfd)