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suarar of the san jum moi l ms , 
This was an umxsually ©ventful year for me. On May 1st, 
1875, I was appointed Assistant Geologist on the Survey of the 
territories, salary 12400*00, and given charge of the San Juan 
Division of the Survey, with George B* Chittenden as topographic 
Engineer* 
the spring season v/as spent in Washington finishing up 
the reports and illustrate ons of the previous year, and editing 
and supervising engraving and printing work# Early in June my 
party assembled at Denver to arrange for the march into the San 
Juan Country, Southwestern Colorado and adjacent areas in Arizona 
and Utah* My report as Geologist is published in the Report of 
the Survey of the territories for 1875, pages 237-278, and separate 
accounts of ©vents of particular interest appear in other connections* 
the report on the ancient ruins of the region, which was published 
in the 1876 report, pages 583 - 408, is the most important of the 
latter* My career as an archaeologist and anthropologist began 
with the study of these most interesting antiquities* 
There were many features of interest, geological and 
otherwise in the summer’s explorations, among which the most im¬ 
portant was my observations of the laccolite (stone late) Intru¬ 
sions of lava among the sediment ary strata. ’This • feature is 
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recorded in ”Contributions to the History of American Geology” by 
George P* Merrill, separate publication from the Report of the U.S* 
National Museum for 1904, page 601, with portrait. For Professor 
