DiLLERl THE KLAMATH PENEPLAIN. 17 
faulted, could not be fully determined during the writer's brief stay 
in that region. 
The next ascent to the Klamath peneplain was by the old Wymer 
wagon road, about 7 miles north of Peacock's ford of Smith River. 
At this point the marine deposits laid down upon the seashore when 
the peneplain had reached its greatest development are well preserved 
and locally full of fossils, both marine shells and leaves from the 
adjacent land. The peneplain rises gradually eastward from 2,450 to 
4,000 feet, and was early recognized as affording the easiest course, 
although longest and stoniest, for the construction of a wagon road 
from Crescent City to Illinois River and C4rants Pass. The Wymer 
and McGrew roads are both on this plain. The McGrew road crosses 
the plain west of Waldo at a little over 4,000 feet, and affords a fine 
view of the plain as it approaches the Siskiyou Mountains, which rise 
above it in a group of irregular and prominent peaks, among which 
Preston Peak (altitude 9,000+ feet) is the most conspicuous. To the 
southwest the crest of the ridge forming the divide south of the 
Middle Fork of Smith River (PI. V, A) shows the plain dipping west- 
ward from the Siskiyous, reaching the coast a few miles south of 
Crescent City, where, at an elevation of about 1,300 feet, a fringe of 
the Sherwood peneplain appears and the descent to the seashore is so 
abrupt that the stage road is forced to climb to the summit of the 
plateau. 
South of Klamath River another ascent to the plateau was made in 
crossing from Mad River at Korbel to Hoopa Valley on the South 
Fork of Trinity River. The divide between Mad River and Red- 
wood Creek is in the Coast Range, and its flat crest is part of the 
Bellspring peneplain. It rises in flat-topped Bald Mountain by 
Acorn to 3,000 feet, and affords an extensive view of the country. 
The next divide to the east beyond Redwood Creek belongs to 
the Klamath Mountains. On the wagon road from Berrys to Willow 
Creek this divide lias an elevation of nearly 3,600 feet, and at 2,500 
feet on the eastern side affords an excellent view in the direction of 
the light-colored granitic peaks about the head of Salmon River. 
They stand out as distinct prominences upon the Klamath plain, 
which rises in that direction to over 6,000 feet. 
With Oscar II. Hershey an ascent was made to the summit of Mount 
Courtney, one of the Salmon Mountains a short distance southeast of 
Thompson Peak. It stands near the head of the South Fork of Salmon 
River and rises to an altitude of over 9,000 feet. From this promi- 
nent viewpoint the general agreement in altitude of the principal 
"idges is impressive, and although the examination was not sufficient 
o determine satisfactorily the relations of this plain of low relief to 
he Klamath peneplain, the evidence suggests that they are of the 
ame age. 
Bull. 196—02 2 
