File:Geology of the Richmond Basin 1899 Plate XLIV.jpg

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English: Plate XLIV from The Geology of the Richmond Basin published by USGS, which has the following caption:
Outcrop of prismatic coke. North of Gayton.

The text of the report refers to the figure as follows:

Dike north of Gayton.—A quarter of a mile north of the Saunders shaft a natural exposure of the prismatic coke is seen. Its appearance is shown in Pl. XLIV. From this locality a dike may be traced north westward at intervals toward the middle of the basin.
Note: This is natural coke or coal that has been heated by the igneous intrusion such that its volatiles have been driven off, sometimes also called clinker. The joint pattern is columnar.
Date
Source Nathaniel Southgate Shaler and Jay Backus Woodworth, 1899. Geology of the Richmond Basin, Virginia. U.S. Government Printing Office. United States Geological Survey.
Author USGS

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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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