. Bulletin of the Geological Society of America. Geology; Geology -- United States. ULL. GEOl. SOC. AM. 1Z 'J: nr — iSic&rd Tinxb. 100' **K^_^fi/voonty 113' £7F**Littyor}( H. I bo 'firiest) I Iowa Hill. \ (nearly level) aWiscons. H. Atyf/s '9 fan' /* sf^Dg rJa 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 Geological Society of America. [New York, etc. ] The Society

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