APPENDIX. VU 



it. The vestiges of earth's history found here where the sea and 

 clouds have alternate dominion over the land, are set forth in a 

 manner simple and perspicuous. 



One very important conclusion reached by Mr. Marvink must 

 not be neglected, viz., that the ranges about this park were not 

 upheaved as great appressed folds, but that the upheaval was 

 along lines by faulting, or narrow zones by abrupt flexure — an 

 important characteristic of displacement throughout much of the 

 interior of this continent — and these facts are eventually destined 

 to modify if not revolutionize the geological theories conccriiing 

 the constitution of the earth. 



After the preparation of this report, in the spring of 18*14, 

 Mr. Marvine again returned to Colorado Territory for the pur- 

 pose of extending his geological studies iii the region west of 

 Middle Park. From my intimacy with Mi". Marvine I know 

 well with what eagerness he resumed these studies and how 

 anxious he was to pursue lines of investigation suggested by 

 facts discovered in his previous work. And so, fired with an 

 enthusiasm for the discovery of the secrets of the mountains, he 

 plunged into the wilderness far away from civilization. All that 

 summer long he toiled, climbing only where the geologist would 

 climb, seeing only what the geologist could see ; and still eager 

 for more knowledge, he pressed his work until the desolate moun- 

 tains were mantled with the winter's snow, and a further study 

 of geology was impossible ; then he returned. But the labor and 

 hardships of the summer's travel, though unheeded at the time, 

 were too great for his physical endurance, and on his return he 

 was prostrated with the disease that held him in firm grasp for 

 many long weeks. Slowly during the following spring he par- 

 tially recovered, and then, although he was not able to work with 

 vigor, those with whom he was more intimate and who loved to 

 taik with him on the subjects of his investigation, learned the 

 great results and significance of the past year's study. Not 

 recovering health and strength, he was unable to return to the 

 field or to prepare the results of his former work for publication ; 

 still he worked on his map, coloring it for the purpose of showing 

 the geographic distribution of the geological formations within 

 his field of study, and this was done with elaboration. Then he 

 thoroughly arranged and systematized his notes and determined 

 his plan of discussion. Here his work ended, for health and 

 strength failed again, and he relapsed into a condition that his 

 friends soon found was hopeless. On the second of March, in 

 the city of Washington, Marvine, the young, enthusiastic, and 

 brilliant geologist, died. 



Mr. Marvine's preparation for work as a geologist was very 

 thorough, and for one of his age, very broad. In chemistry, 

 astronomy, and physics, his studies had been careful and thorough, 

 and his grasp of these subjects was comprehensive and firm ; but 



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