Geology of Piiget Sound Basin. — Kimball. 309 
ation of the local Tejon sandstone series, so far as yet ascer- 
tained, to the Puget Sound basin, seems, along with other 
facts already mentioned, to imply a neighboring area of denu- 
dation, corresponding to the regional post-Cretaceous eleva- 
tion in which the Cascades were at first outlined, and the 
Olympics re-elevated, in common with the Vancouver range 
and the Coast range of British Columbia.* 
Orogenic subsidence, giving origin to the Puget sound mar- 
itime basin, appears to have been incidental to the same 
extensive movements on the Pacific border, as shown by the 
great thickness of the Tejon series at Restoration point. This 
series was finally uplifted and turned on edge during a later 
Tertiary epoch, and ext^avasated with eruptive material which 
likewise overflowed the less tilted, partly eroded and deformed 
coal series at Renton. Base-leveling erosion was doubtless 
concurrent with the epoch of maximum glaciation. To evi- 
dences of continued post-Glacial oscillations of level in the 
Puget sound basin, I have already referred. f Further refer- 
ence to movements of the same kind remains to be made. 
Evidences of generally concurrent oscillations in British Co- 
lumbia have been pointed out by Dr. Dawson. + 
* Dawson op. cit. p. 10. 
lAccording to Mr. Eugene Rickseeker, a raised beach with whole 
clam shells and torredo borings in cemented sand is exposed on the east 
shore of Admiralty inlet, less than a mile north of Admiralty head, 
some nine feet above tide, on the north side of an ancient channel, the 
elevation of which has served to cut off Ciockett lake from the sound. 
An elevated shell bed. about three feet in thickness, is similarly ex- 
posed, eight to ten feet above tide, at the head of the sound, in a rail- 
way cut at the mouth of the Des Chutes river, Mr. Erastus Brainerd, 
of the State Land Commission, to whom I owe this information, has 
sent me several species of shells which have been identified by Mr. R. 
P. Whitfield as follows: Saxidoiii/iis (jiya^ifeus (Deshayes), Saxidonivs 
arvdivs (Gould), SuxidoviuH rigidns (Gould) and Scldzotliyzus nuttdlli 
(Conrad). — Pleistocene forms common to the Pacific coast, — as well as 
7\i]iis rigida (Gould), the edible clam of Puget sound waters. 
Mr. Brainerd is likewise my authority for the occurrence of a raised 
beach with whole clam and scallop shells, at Dungeness, strait of Fuca, 
on Dungeness river, one-half mile above its mouth. The measure of 
elevation as given is about 25 feet. A similar beach has been observed 
by Mr. Brainerd at Ballard, some eighty feet from the present shoie 
line of Salmon bay and about eight feet above tide, and still another at 
Fairhaven. 
The above occurrences were brought to my notice at the close of my 
last visit to Puget sound, too late for a personal examination of the sev- 
eral localities. 
top. cit., p. 54; Am. Geologist, 1890, p. 153. 
