File:USGSBulletin1291 mapofUS MiddlePennTime.png

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Generalized geographic map of the United States in middle Pennsylvanian time.

Description	English: Map of United States in Middle Pennsylvanian Time (about 300 million years ago). Source: USGS Bulletin 1291.
Date	1969
Source	https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/thumbnails/image/USGSBulletin1291_mapofUS_MiddlePennTime.png
Author	U.S. Geological Survey

	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.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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