diller.] THE SHERWOOD PENEPLAIN. 23 
Its relation to the peneplain so well developed on the foothills of 
southern Tehama, Glenn, and Colusa counties, has not been deter- 
mined. 
From the Bald Hills of Shasta County the peneplain rises gradually 
westward (PI. VIII, A) to the flattish crest of the divide, where the 
si age load from Red Bluff to Hay Fork crosses. The best view of this 
plain is obtained from the Bully Choop mine road, at an elevation of 
about 2,500 feet. As one ascends this road two peneplains appear to 
be visible, and their relation is shown in PI. VIII, B, a view taken 
near Watsons Gulch, at an elevation of about 1,100 feet, looking S. 
30° W. The lower plain capping the Bald Hills is the one which 
crosses the range in Hay Fork Gap at an elevation of nearly 5,000 
feet and appears to connect the head of the South Fork of Trinity 
River and of Mad River in Trinity County with the Eel River coun- 
try in the northern part of Mendocino Count}'. 
The higher plain seen upon the distant Yallo Bally Mountains in 
PI. VIII, B, appears somewhat irregular, but from a level of over 
4,000 feet its plateau character is marked. The upper plain is the 
Klamath peneplain and accords with that so well marked on the 
western slope of the Klamath Mountains. About the southern end of 
.1 
Yallo Bally Mto. f 
(7000'J f 8604 ') , . Sacramento Valley g 
-1^1 "-^ (6000) GreasewoodH.lls ? 
^ ~~^Jjooo>o/oooy Grave | p i ain g 
Fig. 2.— Generalized profile of Coast Range and Klamath Mountains on the fortieth parallel. 
South Fork Mountain the two plains may again be observed, but it 
is by no means certain in places that the difference of level is not due 
to displacement and that both are not parts of the same plain. The 
matter can not be definitely settled until the topography and geology 
can be worked up in much greater detail. 
In the vicinity of Klamath River there is an extensive deposit of 
gravel, forming the divide west of that stream from the South Fork of 
Trinity River to Gold Bluff on the coast, which belongs, approximate!} 7 , 
to the Sherwood epoch, and which will be noted more particularly 
under the head of the earlier vallej^s of the Klamath River. 
PEOFILB ACROSS COAST RANGE AND KLAMATH MOUN- 
TAINS NEAR THE FORTIETH PAKALLKL. 
Fig. 2 illustrates a generalized profile of a cross section of the Coast 
Range and Klamath Mountains near the fortieth parallel, which will 
give a clearer idea of the form of these uplands than may be gained 
from the fragmentary descriptions. No survey was made for this 
section, and the plateau feature is somewhat exaggerated by the 
omission of small valleys. When viewed from the lowlands along the 
coast or the stream canyon of the western slope, the country looks 
