On the Geology of the Northwestern Regions of America. 337 
line from the north side of Kotzebue Sound to within a few 
miles of Point Barrow, and form the chief constituent of the lofty 
and conspicuous headlands of Cape Thompson, Cape Lisburn, 
and Cape Sabine. Near the last-named cape a vein of excellent 
coal is exposed, which burns with a good heat and a bright flame. 
The limestone, is according to Dr. Buckland, scarcely distingnish- 
able from the Mountain Limestone of Derbyshire. Some speci- 
mens brought to England by Capt. Beechey were found to contain 
Lithostrotion basaltiforme ( Cyathophyllum basaltiforme, Phil. 
G.Y.), Flustra, Productus Martini, Dentalium, several varieties 
of Terebratula, and a great abundance of Encrinital fragments, 
with the detritus of which the rock was in many places almost en- 
tirely made up. To these Dr. Grewingk adds, from the collections 
of Russian explorers, Cyathophyllum fleruosum, Goldf.,, Tur bi- 
nolia mitrata, His., Cyathophyllum dianthum, Goldf., and Sarei- 
nula, together with some Spiriferi, Orthide, and Terebratule. 
Remains of coniferous plants belonging to the genera Abies 
and Tarodium, and of some Ferns, among which is Neuropteris 
acutifolia, have been discovered among the. islands along the 
South coast of Aliaska. 
A specimen of Catenipora escharoides, found in a rolled frag- 
Ment on the island of Sitka, would appear to indicate the exis- 
tence of Silurian deposits in the neighborhood; but no organic 
remains from rocks of this formation in situ have hitherto been 
iscovered, 
Jurassic Fossils.—Four fossils found in Katmai Bay, on the 
south coast of the promontory of Aliaska, have been referred by 
Dr. Grewiitgk, on the authority of M. Wosnessensky, Curator of 
doubted, however, whether upon such scanty evidence the ; 
ence of deposits of Jurassic age in these high latitudes, can be 
i en 
this formation having been hitherto discovered in any part of 
North America north of the United States. 
Tertiary Fossils.—T races of the tertiary formation have been 
discovered at varions poiuts between Oregon and Aliaska, but not 
beyond, This striking and well marked division of the coast 
may, therefore be considered, in the present state of our informa- 
lion, to be the northern limit of the extensive Tertiary formation 
along the shore of the Pacific. ‘The fossils enumerated by Dr. 
Stconp Seums, Vol. XXI, No. 63.—May, 1856. 43 
