56 TOPOGRAPHIC DEVELOPMENT OF KLAMATH MOUNTAINS, [bull. 19(5. 
Across this plain there was cut, with more or less distinctness, a broad 
valle}^ before the uplift which resulted in the cutting of the present 
narrow stream valle}^. As the earlier valley was~ seen from the 
Garberville road on the way to Shelter Cove, the stage of development 
has been called the Garberville stage. 
EARLIER VALLEYS OF RUSSIAN RIVER AND CACHE CREEK. 
Beyond this point Eel River was not crossed again, and at the cross- 
ing of Russian River and Cache Creek the earlier valleys were not 
especially noted. In ascending Bartlett Mountain, however, from 
Upper Lake a well-developed terrace was found at from 3,000 to 4,000 
feet, about 1,000 feet above Upper Lake post-office. 
EARLIER VALLEY OF STONY CREEK. 
Prominent traces of the earlier valleys, such as are found along the 
rivers of the western slope of the Klamath Mountains, would hardly 
be expected along the small streams of the eastern slope, and yet in 
places there are broad plains recording an important valley stage 
between the completion of the Klamath peneplain and the present 
time. These are clearty due to soft rocks — shales — for on the harder 
rocks — sandstones and conglomerates — along the same streams the 
plain is not developed. The most important plain of this nature is 
along Stony Creek, in the southwestern part of Glenn County. About 
the town of Elk Creek, where Elk, Bristo, and Grindstone creeks 
enter Stony Creek, there is a broad plain extending from Elk Creek 
Ridge to the base of the Coast Range and having an altitude of about 
850 feet above the sea. This plain may be seen to advantage from 
the slope of Elk Creek Ridge, looking north. On the left is the Coast 
Range and on the right are the even-crested hills of Stony Creek 
which mark the Klamath peneplain. The streams from the moun- 
tains cut canyons across the Stony Creek plain to the depth of 100 
feet, but Stony Creek, a larger stream, has developed broad flood 
plains about 50 feet below the general level of the plain. 
Ten miles north of the town of Elk Creek Stony Creek enters the 
even-crested foothills capped by the Klamath "peneplain and cuts a 
canyon through them to the alluvial plain of the Sacramento. Far- 
ther northward, near Newville, on the same belt of shales, a plain 
corresponding to that of Elk Creek has been developed. The large 
size and sharpness of these plains indicate that they most likely 
record an attitude of the land and are probably not due to a level of 
local obstruction in the canyon of Stony Creek. On the divide at 
Millsaps between Elk Creek and Newville is a remarkable terrace 
which lies between the two plains. Earlier and later valleys of small 
depths have been seen on Thomas Creek, in Tehama County, but 
farther northward they have not been clearly distinguished. 
