diller.] THE BELLSPRING PENEPLAIN. 19 
stages. Although it is possible to distinguish the Klamath and Bell- 
spring peneplains in places, it is not possible everywhere, especially 
about the southern end of the Klamath Mountains and along the bor- 
der of the Sacramento Valle}^, where all remnants will be considered 
together in connection with the Bellspring peneplain. 
REMNANTS OF THE BELLSPRING PENEPLAIN. 
Bear Ridge has considerable flat tracts at elevations between 2,000 
and 2,500 feet, although Mount Pierce, which is itself flat topped, 
rises to 3,278 feet. In Rainbow Ridge the gentle features bulge up 
to 3,400 feet, but in Kings Peak, farther south toward Shelter Cove, 
the prominences rise to a little over 4,000 feet and thence gradually 
descend with an even crest line overlooking the coast to a lower and 
extensive plain drained by the South Fork of Eel River. 
To the southeast Mail Ridge rises and appears to become irregu- 
lar, but when one ascends on the stage road to Bellspring, approx- 
imately 4,000 feet, the upland surface is seen to be of gentle relief, 
although it is less regular than that of the divides about Mad River. 
Near the northern end of Red Mountain is a prominent, unsymmet- 
rical hill, with long, gentle, easterly slope and steep in the opposite 
direction, suggesting faulting; but it is possible also that the form is 
determined by the position of the strata. However this may be, it 
is clear that the gentle-featured surface has been much broken and 
warped. 
Laytonville lies in a long valley at the eastern base of Cahto Peak, 
whose flattish summit of sandstones rises to an elevation of 4,251 
feet, affording an excellent general view of that portion of the Coast 
Range. Here may be seen to advantage not only the somewhat irreg- 
ular, although, on the whole, gentle features of the upland surface 
(Bellspring peneplain), but also the lower plain (Sherwood peneplain) 
in the valley of the South Fork of Eel River. The lower plain, some 
distance away, lies about 1,400 feet below the gentle upland of Cahto 
Peak, and sweeps about the western and southern base of the moun- 
tain to form the divide between Eel River and the coast. 
The high hills opposite Ukiah, forming the divide between Russian 
River and Clear Lake, when seen from Calpella, appear to have irreg- 
ular crests largely covered with greasewood, but when seen from the 
southern side are much more regular in outline and comparable with 
Bartlett Mountain, which forms the even-crested divide between Clear 
Lake and Bartlett Springs. Bartlett Mountain dips SE. 2°, and to the 
northwest is succeeded by Little Horse, Big Horse, and other flat- 
topped mountains, clearly preserving large tracts of the Bellspring 
peneplain. Above the point crossed by the old road to Bartlett Springs 
the ridge has an altitude of 5,000 feet. The crest is comparatively 
smooth, covered with timber, and easily traveled. Good views from 
this plain show that it rises northwestward to the head of Eel River, 
