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Stratigraphic Framework of Cambrian and Ordovician Rocks in the Central Appalachian Basin from Richland County, Ohio, to Rockingham County, Virginia

By Robert T. Ryder

Revised and Digitized By Robert D. Crangle, Jr.

Online Version 1.0


Available files for download include PDF, EPS, and AI formats.

All file formats will produce a plot that faithfully replicates the format, symbols, colors, and line work of a USGS full-color printed map. (The actual published paper maps are 4-color offset-printed maps.) The PDF file is 7.2 MB, the EPS file is 19.2 MB, and the AI (Adobe Illustrator) file is 2.4 MB.  Page size at 100% is approximately 45" by 36".  Plot resolution, quality, and colors will vary with plotter, inks, and paper used. Adobe Acrobat Reader 4 or later is required to read the PDF file, and Adobe Illustrator 9.0 or later is required to read the AI file.

Miscellaneous Investigations Series Map I-2264 [1.2 MB PDF file]
Miscellaneous Investigations Series Map I-2264 [19.2 MB EPS file]  -- CAUTION, LARGE FILE SIZE
Miscellaneous Investigations Series Map I-2264 [2.4 MB AI file]

If you wish to download the latest version of Acrobat Reader, free of charge, click here.
Adobe Acrobat Reader

The offset-printed version of this map is available for purchase from USGS Information Services. See Ordering U.S. Geological Survey Products, call toll-free (from the U.S.) 1-888-ASK-USGS, or e-mail

Contact: Robert T. Ryder or Robert D. Crangle, Jr.
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