DescriptionWilliston Basin stratigraphic column (cropped).jpg	English: Williston Basin stratigraphic column, with explanatory text cropped
Date	1 January 2013
Source	This file was derived from: Williston Basin stratigraphic column.jpg:
Author	File:Williston Basin stratigraphic column.jpg|Original: Lawrence O. Anna, Richard Pollastro, Stephanie B. Gaswirth, Richard M. Pollastro, Laura N.R. Roberts, and Troy A. Cook Cropping: Hike395

Original:

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Cropped version:

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This image is a derivative work of the following images:

• File:Williston Basin stratigraphic column.jpg licensed with PD-USGov-USGS
  • 2020-07-18T20:23:54Z Pi3.124 178x799 (60491 Bytes) Uploaded a work by Lawrence O. Anna, Richard Pollastro, Stephanie B. Gaswirth, Richard M. Pollastro, Laura N.R. Roberts, and Troy A. Cook from U.S. Geological Survey Williston Basin Province Assessment Team, 2011, Assessment