14 
SOUTHWESTERN NEVADA AND EASTERN CALIFORNIA. 
lebrand, George Steiger, and Waldemar T. Schaller the writer is in- 
debted for mineralogical determinations, and to Messrs. E. O. Ulrich, 
G. H. Girty, Edward M. Kindle, and F. H.»Knowlton for paleon- 
tologic data. The helpful interest and kindly hospitality of the Ne- 
vada pioneers is also gratefully acknowledged. 
LOCATION AND AREA. 
The area surveyed (see fig. 1) is situated in the south-central por- 
tion of the Great Basin and includes portions of Esmeralda and Nve 
Fig. 1. Index map showing location of area in southwestern Nevada and eastern 
California. 
counties, Nev;, and Inyo County, Cal. The topographic map is on a 
scale of 1 : 253,440 (approximately 4 miles to the inch), with contour 
intervals of 100 feet, and covers the area lying between 36° 30' and 
38° north latitude, and 110° 00' and 117° 30' west longitude. This 
area, embracing within its limits 8,550 square miles, is the equiva- 
lent of nine of the usual 30-minute quadrangles of the Geologic 
Atlas of>the United States, 
