. Correlation papers ; Devonian and Carboniferous. Geology, Stratigraphic; Geology, Stratigraphic; Geology. 7?<AisiA~7? JUcA-zyy^ DEPARTMENT OP THE INTEBIOll BULLETIN OF THE UNITED STATES GEOLOGICAL SURVEY No. SO. WASHINGTON GOVERNMENT PRINTING OFFICE 1891. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Williams, Henry Shaler, 1847-1918. Washington, Govt. Print. Off.

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