338 On the Geology of the Northwestern Regions of America, 
Grewingk include some well-known species of the Tertiary age 
in Europe; among which may be mentioned Cardium Gren- 
landicum, Chemn., C. multicostatum, Venerupis Petitii, Desh., 
ya arenaria, Tellina edentula, Sow., Astarte corrugata, Myti- 
lus Middendorffi, and Ostrea longirostris, Lamk. Some new 
species of the same genera are added by Dr. Grewingk, together 
with some forms of Sazicava, Pectunculus, Nucula, Pecten, 
Crassatella, and Venus. 
Fossils of the Drift.-—Organic remains of the Pleistocene or 
on the east side of the Rocky Mountains. The cliffs aud sand- 
banks, wherever they have been examined along the coast, abound 
with recent shells of the genera Cardium, Venus, Turbo, Murex, 
Solen, Trochus, Mytilus, Mya, and Tellina. Fossil remains of 
Mammalia, especially those of the Mammoth, are likewise abund- 
ant. ‘Teeth of this animal have been discovered on the banks of 
several rivers north of Mount St. Elias; and there is a celebrated 
locality at Escboltz Bay, in Kotzebue Sound, where the thawing 
and wasting of the frozen cliffs is continually exposing the bones 
aud tusks of Mammoths and other quadrupeds. Dr. Buckland, 
in his interesting account of the specimens collected at this place 
during Captain Beechey’s Voyage, enumerates fragments of bones 
of Mammoths and of the Urus, the leg-bone of a large Deer, 
and a cervical vertebra of some unknown animal, different from 
any that now inhabit Arctic America. Along with these were 
found also the skull of a Musk-ox and some bones of the Rein- 
eer, in a more recent condition than the others. Similar remains 
including those of the Mammoth, have likewise been discovered, 
according to Dr. Grewingk, at Cape Nugwoljinunk, at Bristol 
y, and at Norton Sound, as well as in the Pribulon Islands, 
and lastly at Unalaschka. 
what remarkable circumstance that no similar remains have as 
: : : : 
the east of the Rocky Mountains. None have hitherto been 
found, according to Sir John Richardson, in the Hudson’s Bay 
Territories, though the annual waste of the banks and the frequent 
‘ips would have revealed them to the natives or fur-traders 
whatever way the circumstance may be accounted for, — 
gists have 
arrived, that the countries on the eastern aud western sides of tt q 
ky Mountains have been elevated at different periods a0 
under different geological conditions. 
