REPORT OF W. J. HOFFMAN, M. D. 



LETTER OF TRANSMITTAL. 



United States Geological and Geographical 

 Survey of the Territories, 



Washington, D. (7., December 31, 1877. 

 Sir : I have the honor to transmit herewith my report of observations 

 upon a cliff-dweller's cranium, found in Chaco Canon, New Mexico, by 

 Mr. W. H. Jackson, at a depth of 14 feet beneath the surface, lying upon a 

 stratum of broken pottery. The deposit in this canon consists of allu- 

 vial drift, in which are several arroyos from 6 to 16 feet deep, by the 

 erosion of which the lower stratum was brought to view. 

 Very respectfully, your obedient servant, 



^W. J. HOFFMAN, M. D. 

 Dr. F. Y. Hatden, 



United States Geologist in charge. 



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