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Clark, B. L. (1938). Fauna of the Markley Formation (Upper Eocene) on Pleasant Creek, California. Bulletin of the Geological Society of America. 49: 683-730.
Clark, B. L. (1938). Fauna of the Markley Formation (Upper Eocene) on Pleasant Creek, California. Bulletin of the Geological Society of America. 49: 683-730.
