Fossil log standing nearly upright in clay shale of the Fort Union formation. Dunn County, North Dakota. 1913.
Dates
Date Taken
1913
Summary
Fossil log standing nearly upright in clay shale of the Fort Union formation. Dunn County, North Dakota. 1913. Plate 21-A in U.S. Geological Survey Bulletin 726. 1922
Summary
Fossil log standing nearly upright in clay shale of the Fort Union formation. Dunn County, North Dakota. 1913. Plate 21-A in U.S. Geological Survey Bulletin 726. 1922
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