816 The American Naturaüst. [September, 
Lamellibranchs, 44 Scaphopods, 33 Pteropods, 1127 Gasteropods, 
and 2 Cephalopods; implying a total molluscan fauna of “at 
least eighteen hundred forms.” 
^. *STEanRNS, R. E. C.— Notes and comments on the distribution 
of Planorbis bicarinatus. West American Scientist, VI, p. 110, 1889. 
SrERKI, V. A.—A Study of the American species of Vertigo 
contained in the U. S. Nat. Mus., with a description of a new 
sub-genus of Vertigo. Proc. Nat. Mus., XI., p. 369, 1888 [1889]. 
— New sub-genus Angustula. 
NEWLY-DISCOVERED GLACIAL PHENOMENA IN 
THE BEAVER VALLEY. 
BY P. MAX FOSHAY AND R. R. HICE. 
AT the mouth of Connoquenessing Creek the valley of the 
Big Beaver is typically developed. The hills on either 
side, rising to an elevation of 1200' + A.T., slope rather gently 
down to the old base level plain, here at an elevation of 180’+ 
above the present river level, or gio’ + A.T. This plain marks 
the level of a system of preglacial drainage at this point, which, 
as has been heretofore suggested, was probably to the north. The 
plain is covered with a fine, close, and very tough whitish or 
yellowish clay, shading away at some points into a mixture of 
sand and gravel, the pebbles for the most part being well-rounded 
quartz, in size from one and one-half inches in diameter downward. 
Near the middle of this old river valley is a gorge, 200 to 300 
yards in width, cut almost perpendicularly into the heavy sand- 
stones, the Homewood and lower members of the Conglomerate 
series, and reaching to a depth of 125’ + below the present level 
of the Beaver, having a total depth of 300’ +. i 
Two or three miles to the north occur great deposits of Don 
nic material which were supposed to mark the southern limit of 
glacial action in the Beaver valley. 
! H. C. Lewis and G. F. Wright, Second Geological Survey of Penna., Vol. Z, p. 19% 
