ro ee eee ee TS ee ee ea a aS 
1886,] Geology and Paleontology. 803 
Volga to the foot of the Tian-Shan, do not exceed one hundred 
feet in thickness, and can hardly be delimitated more the Tertiary; 
the fossils they contain all belong to species now living in the 
Caspian and Aral. The limits of the Aral-Caspian Post- 
pliocene sea are discussed. 
Silurian—J. H. Panton has noted the occurrence of upwards 
of fifty species of corals, brachiopods, and cephalopods, with Re- 
ceptaculites, Beatricia and Stromatopora, ina rock of Silurian age 
largely used in Winnipeg as a building stone. The seven expo- 
Sures are described, most of them upon the level, but some ele- 
vated slightly above the prairie, though all were more or less 
covered with drift before quarrying was commenced. The 
American Journal of Science (April, 1886) contains another 
contribution to the literature of the Taconic rocks in the shape of 
descriptions of Lower Silurian fossils from a limestone of the 
original Taconic of Emmons. The report upon the fossils is by 
S. W. Ford and W. B. Dwight, and Professor J. D. Dana concludes 
from the results that these limestones of Canaan, N. Y., are of 
Trenton age, 
Carboniferous and Permian.—According to the researches 
of M. B. Renault, the genus Bornia must be ranged with Calamo- 
dendron and Arthropitus. From these genera it differs in the 
hill fragmentary character of its elements, but by its relief. The 
T formed by it, instead of the square flattened form of Triassic 
S, - 
€n found in Palæozoic rocks. Though the difference in mineral 
acters between these beds and those of the upper Old Red 
