472 The American Naturalist. 
Colorada River in Texas, and the older ones of the Connecticut 
He suggests that the modes of formation may be identical. In 
case the floods and sentiment supply arise chiefly from the c 
accident of desiccation, while in the other they are the result of 
accident. (Am. Journ. Sci. July, 1892.) 
M. E. Ficheur has added an important fact to the knowledge of 
geology of northern Africa. He finds that on the northern flan 
the Atlas Mountains in Blidah (Algeria), and throughout the ext 
of the region occupied by the Chiffa schists, there is an anteclinal 
affecting the whole sedimentary series, a fold long drawn out 
turned toward the north, This phenomenon appears to be the re 
of a lateral thrust from the north against the resisting mass of 
Chiffa schists which formed, to all appearance, an island in the C 
aceous Sea. This folding took place after the Carté¢irenne period, 
very probably after the Helvétien stage, for these beds are seen to 
disturbed at the end of this range on the slopes of the spur on the 
side of the Harrach. M. Ficheur is of the opinion that the foldi 
limited to the Blidah range. (Revue Scientifique, Feb. 1893.) 
Paleozoic.—In his notes on the Devonian formation of Mar 
Mr. J. F. Whiteaves remarks that in Manitoba the Stringoceph 
zone is remarkably clearly developed, and holds a rich fauna, whe 
in the Mackenzie River district, most of the fossils so far coll 
seem to be from the Cuboides zone. (Geol. Mag., Feb., 1893.)— 
Rollin Keyes calls attention to a well defined Kinderhook fauna i 
ealated in the Burlington limestone in northeastern Missouri. 
fossils, chiefly molluscan, are found in a heavily bedded white e 
limestone with a peculiar white chert in nodules and i 
bands. The forms are all species which characterize the Kin¢ 
of Burlington, Iowa. This seems to be an illustration of Ba 
celebrated “ doctrine of colonies, ” (Am. Journ. Sci., Dec., 1892) 
Mesozoic.—According to Mr. H. W. Fairbanks the granitic 
of southern California are not Archean. They are present as 
sions squeezed into rocks varying in age from the Jurassic to F 
inclusive at the close of the Jurassic. (Geol. Mag., Feb., 1893. 
Mr. A. Smith Woodward reports the skeleton of a fish from the 
Clay of Wiltshire, England, which he “provisionally quotes 
immature example of Ischyodus egertonii.” The fossil tends 
firm the reference of Ischyodus-like fishes to the existing 
