U.S. Geological Survey Scientific Investigations Map 2817-C


By Charles G. Mull,1 David W. Houseknecht,2 G.H. Pessel,3 and Christopher P. Garrity2

Version 1.0 - May 2006
Version 1.1 - December 2006
Version 1.2 - January 2007

1Alaska Division of Oil and Gas, Anchorage, AK 99501.
2U.S. Geological Survey, Reston, VA 20192.
3Alaska Division of Geological and Geophysical Surveys, Fairbanks, AK 99709.


Part of a petrified tree trunk preserved in growth position, Cretaceous Nanushuk Formation   This map is a product of the USGS Digital Geologic Maps of Northern Alaska project, which captures in digital format quadrangles across the entire width of northern Alaska. Sources include geologic maps previously published in hardcopy format and recent updates and revisions based on field mapping by the Alaska Department of Natural Resources, Division of Geological and Geophysical Surveys and Division of Oil and Gas, and the U.S. Geological Survey. Individual quadrangles are digitized at either 1:125,000 or 1:250,000 depending on the resolution of source maps. The project objective is to produce a set of digital geologic maps with uniform stratigraphic nomenclature and structural annotation, and publish those maps electronically. The paper version of this map is available for purchase from the USGS Store.
Readme file [23-KB PDF file]
SIM 2817–C [2.1-MB PDF file; 32 x 35 inches]
GIS data package [9.6-MB ZIP file; ArcGIS 9.X geodatabase]


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Part of a petrified tree trunk preserved in growth position in sandstone of the upper part of the Cretaceous Nanushuk Formation. The exposed petrified tree is the largest at the Lili Creek locality, which is at the head of Lili Creek, a tributary of the Meade River. The portion of the tree shown here is approximately 2 ft wide and 4 ft high. Photograph by Paul Decker (ConocoPhillips, Inc.).


Scientific contact: David W. Houseknecht

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