USGS: Science for a Changing World - USGS visual identity mark and link to main Web site at http://www.usgs.gov/    Alaska Department of Natural Resources and link to Web site at http://www.dnr.state.ak.us/

Chronostratigraphic column for the Colville basin, northern AlaskaFigure 3. Chronostratigraphic column for the Colville basin, northern Alaska, showing revised stratigraphic nomenclature and ages of units discussed in this paper (in color); laterally correlative and overlying and underlying units not discussed in this paper are uncolored in diagram. Abbreviations or symbols are as follows: <?>, uncertain relationship; cs*, cobblestone sandstone of Fortress Mountain Formation (informal unit of Mull and others, 2003); ms**, manganiferous shale unit (informal term); Kemik***, Kemik Sandstone (formation) as revised by Molenaar and others (1987); Fm., Formation; Mtn., Mountain; LCU, Lower Cretaceous unconformity. Geologic time scale from Gradstein and Ogg (1996).

PRINT/VIEW a high-quality PDF image

U.S. Department of the Interior, U.S. Geological Survey
URL: https://pubsdata.usgs.gov/pubs/pp/p1673/thumbnails/fig3.html
Maintained by Eastern Publications Group
Last modified: 16:05:09 Thu 01 Dec 2016
Privacy statement | General disclaimer | Accessibility