. Bulletin of the Geological Society of America. Geology; Geology -- United States. Ridges, tfOOOo' 60000' Bucktyt HUL /AyUrautiC mine). -irrT ~-~ ^--â **^-ââ ^vr *â- Zoooo' ZSooo' 30000' elev. ofchanntl. !>*«â¢__ I "daposils. 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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