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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. yj 



were found. In ]\Iiddleto\vn the old lead mine, famous as a source of 

 metallic lead for bullets in Revolutionary days, v^^as examined. The 

 Cheshire barite-copper mine and the trap quarry on Mt. Carmel 

 were visited, and the last trip of the season included a visit to the now 

 famous mineralogical locality of the tungsten mine at Long Hill in 

 Trumbull. On this trip the old Booth-Curtis bismuth mine in Monroe, 

 long a source of native bismuth specimens, was located, but too late 

 to secure extensive collections. 



GEOLOGICAL FIELD-WORK IN NEVADA 



During the four months, June to September, Dr. W. F. Foshag, 

 assistant curator of mineralogy, U. S. National Museum, worked in 



Fig. 34. — Walker Lake, Nevada, showing the old shore lines of 



Lake Lahontan. 



cooperation with one of the U. S. Geological Survey field parties in 

 the mapping' of the Hawthorne quadrangle, western Nevada, making 

 a special study of the mineralogy and ore deposits of the area. Besides 

 Paleozoic and Mesozoic sedimentary rocks, Cretaceous granites and 

 Tertiary lavas, the area embraced a number of interesting lake beds 

 of Miocene, Pliocene and Pleistocene age, in which were found the 

 remains of fishes, fresh water gastropods, plants, and the bones and 

 teeth of horses, camels, mastodon, and rhinoceros. A reported occur- 

 rence of artifacts in the beds of the extinct lake Lahontan, Pleistocene 



