710 ARTHUR C. TROWBRIDGE 



it seems to be a continuous plain sloping from the mountains; 

 but studied in detail, it resolves itself into low, gently sloping fans 

 separated by broad, ill-defined, shallow depressions. The fans 

 deploy and become less distinct at a distance from the mountains; 

 the depressions are therefore broader, deeper, and better defined 

 close to the mountains. At its outer edge, the topography of the 

 deposits approaches a plain, in which neither fans nor inter-fan 

 areas can be distinguished. 



The axes of the fans are on lines which are continuations of 

 canyons in the mountains; the depressions are between the mouths 

 of the canyons. 



From Owens Lake north, the following fans can be distinguished : 

 those of Richter, Tuttle, Lone Pine, Hogback, George, Bairs, 

 Shepard, Pinyon-Pine, Oak, Thibaut, and Sawmill creeks. The 

 last three are small though sharply defined. 



A few notes taken north of Lone Pine Creek are here copied, 

 in so far as they refer to the topography of the fans: 



The fan opposite Lone Pine Canyon is sharply set off from the fan of Hog- 

 back Creek to the north. Beginning at the mouth of the canyon, it spreads 

 promptly to the north, a distance of about half a mile at the immediate foot 

 of the mountains, and one and one-half miles within a distance of a mile from 

 the mountains. Farther from the mountains, it joins the fans on either side, 

 and its distinctness is there lost. Its north edge is fairly distinct for two miles 

 from the mountains, being markedly higher than the broad, irregular, linear 

 depression between it and the fan of Hogback Creek. This depression is dis- 

 tinct near the mountains, but becomes gradually shallower and narrower 



away from the mountains, until the two fans coalesce two miles or so out 



From the depression, the slope of the fan of Hogback Creek shows a distinct 



rise The south side of the fan of Shepard Creek is not especially 



well developed, though it is set off distinctly from the fan to the south. The 

 depression between these two fans is about 200 ft. below their tops, and is one- 

 fourth to one-half a mile broad North of the fan of Shepard Creek, the 



surface declines and does not again reach the high level of this fan as far as the 

 alluvium can be seen. 



The streams have a distinct tendency to leave their fans for 

 the depressions between. Shepard Creek now flows in the depres- 

 sion south of its fan. The North Fork and South Fork of Oak Creek 

 have joined in the depression between their respective fans. At 

 some time they were undoubtedly parallel streams. The photo- 



