U. 8. QEOLOCrCAL SURVEY 



BULLETIN C12 PLATE XLII 



UNITED STATES RECLAMATION SERVICE DAM ON TRUCKEE RIVER IN THE VIRGINIA RANGE, BELOW RENO, NEV. 



Terraces of Lake LahonUn beds in foreground, a broad, low alluvial fan ai the mouth of "the gulch, and sonnbGr-looking hills covered with broken fragments of Tertiary lavas, 



Photograph furnished by Southern Pacific Co, 



