Geoloyy of the Paijet Sotoul Basin. — A'iinbdU. 231 
clam beds six to twelve feet above tide and two and one-lialf 
feet below the top of the marginal plateau, and uncovered in 
the gullies as far back as 100 feet inland. The same beds are 
clearly exposed along shore in the bank for several hundred 
feet. Though extremely fi-agile, the shells are whole, and in 
a state of perfect preservation. The present beach is white 
with their fragments. Two species are identified by Prof. 
Whitfield as follows: Saxidomits (/it/anteas (Deshayes), a 
Pleistocene form still existing on the Pacific coast; and Saxi- 
domus rigidns (Gould), occurring at Santa Barbara in raised 
beaches, and also a living form. 
Considering the habitat of these bivalves, along with the 
uniformity in hight of the baseleveletl margin, and its allu- 
vial extension on opposite sides of the original islet, the 
measure of regional re-elevation locally indicated may be esti- 
mated as not less than 25 feet. -Behind the solid promontor}', 
as remains to be explained, a low eroded alluvial surface, at 
about the level of the sea margin, is followed by the carriage 
road to Rich's passage. The same depression doubtless repre- 
sents a level which, in common with the ancient clam beds, 
was submerged antecedent to elevation. A single baseleveled 
outcrop of the sandstone is obscurely seen in the road. Rich's 
passage, like the main channel of the sound, is excavated di- 
rectly across the Tejou uplift. 
The peculiar configuration of the baseleveled marginal pla- 
teaus, so characteristic of the topograph}^ terminated by the 
few rocky points on opposite shores of the sound, and of all 
littoral survivals of that uplift, is, in the light of the above 
evidence of post-Glacial re-elevation, readily explained. 
The Restoration point uplift crosses the Point Glover pe- 
ninsula under uniform topographical conditions implying 
basehiveling erosion and subsequent re-elevation. Here, how- 
ever, it is seen to rise on the flank of an eruptive belt which 
likewise crosses the peninsula from a point opposite Nibbeville 
(Port White) with the same strike as the sandstone series — 
in line, tliat is, with Restoration and Alki points. While the 
northern contact of the intrusive belt, following a plane of 
stratification, is very sharply defined, the southern contact, 
for lack of opportunity, was not traced so as to determine the 
breadth of the belt. This can readily be done by examination 
