Campbell] GEOLOGY ALONG ROUTE TRAVERSED. 21 
Colemanite is reported as occurring at Lone Pine, north of Owens 
Lake, in a bed 1 foot in thickness, but the exact locality was not made 
public, hence the report could not be verified. Similar beds are also 
reported near the Darwin road, but nothing definite could be learned 
regarding them. 
OWENS LAKE TO SAN BERNARDINO. 
Bedrock Canyon. — From Owens Lake the route lay south along the 
foot of the Sierra Nevada to Mohave station, and thence across Mohave 
Desert to the foot of the high mountains bordering the desert on the 
south. 
No lake beds were seen on "this route after passing Rose Spring, 
which is located at the southern extremity of the sediments of the 
Owens Lake basin, until Redrock Canyon was entered west of El Paso 
Peak. They are well exposed along this canyon for a distance of 6 
miles, and dip to the west at an angle of about 20 c . The basal portion 
of the series is composed of coarse, indurated sand, gravel, and vol- 
canic tuff, with intercalated lava sheets. The upper portion is free 
from volcanic material, and fine cla} T predominates. Little alkaline 
material was seen. The beds have the appearance of being deposited 
near the shore of a large body of water, where such material was not 
abundant. It seems probable that these beds are connected with the 
Tertiary beds of El Paso Peak, which, from their contained fossils, are 
regarded as of Eocene age. It is therefore probable that the series 
exposed in Redrock Canyon also belongs to the Eocene period. 
Mohave Dexert. — From Mohave station to the south edge of the 
desert there are no beds of this character exposed. Buttes of crystal- 
line rock occur at intervals along the route, but there seems to be no 
opportunity for lake beds to be present, unless the} T underlie the alka- 
line flat north of Lancaster. This seems possible from the fact that 
near this place flowing wells are obtained which probably have their 
origin in gravel beds from 200 to 300 feet below the surface. 
From Lancaster the foot of the mountain was followed to the east 
as far as Sheep Creek Canyon. Throughout most of this interval the 
foothills are composed of coarse gray granite, against which rests the 
Pleistocene gravel that covers and conceals the desert floor. 
At Sheep Creek the road crosses the mountain to the head of Lone 
Pine Canyon. It follows the latter to its junction with Cajon Canyon, 
where it unites with the road traversed at an earlier date. 
RESUME. 
From the observations noted above and from descriptions of other 
geologists, it is apparent that lake sediments occur throughout a with 4 
extent of territory in the Great Basin region. Some writers have 
supposed that the various outcrops are part> of one extensive sheet of 
sediment which was deposited in a widespread but shallow lake, and 
consequently that they are all of the same age 
