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PROFESSOR HOLMES 1 RESEARCHES OH THE GEOLOGICAL HISTORY 
OF THE YELLOWS I OHE CAHYOU. 
It is a matter of personal gratification to 
find my geological work of 1878 in the Yellowstone Park, 
as recorded in the Hayden Survey Report for 1878 and which 
has remained unnoticed for fifty years, cited as the most 
successful interpreted; ion of the geology of the Grand Canyon 
yet published. The two well know geologists, Professor 
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R. M. Field of Princetonj/and Professor 0. T. Jones of 'Man - 
yKA,'H>x/VvUA , 
Chester, who had spent the summer of 1928 in a careful study 
of the Canyon region, called upon me on their return from 
the field in the fall to congratulate me on ray work there, 
researches almost forgotten by me, the announcement which 
caused me to exclaim ?, Kolmes geologically dug up l” 1878 
was my last year in Rocky Mountain field geology, archeology 
and later art having claimed me. 
So gratifying is the report of these gentlemen 
that I am tempted by a modest feeling of triumph to quote the 
following from their Report published in the AKSRICAH JGURHAL 
CF SCIEHCE for March 1929. I may add that this quotation 
is but one of the several references approving of my inter- 
pretations. 
... "Upon our return to the east we reexamined the 
bibliography on the geology of the Yellowstone Park, Since 
the publication of the Yellowstone Folio in 1905, we could 
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not fine any record that the facts mentioned above had been 
