2ii8 Tne Americuit Geologist. October, 18% 
The froshiiesH of many of the pebbles in this oldest drift shows it to be 
of comparatively recent au^e, and not so enormously old as some have 
thoufifht it to be. There are occasional pebbles which had evidently 
b(H^n deeply weathered and then were subjected to glaciation on erne or 
two sides, so that the weathered parts are worn through. Since the 
glaciation the weathering has been slight, thus demonstrating that the 
presence of weathered pebbles in glacial deposits is not a certain evi- 
dence of great age. In this region the pebbles and cobbles had been 
rolled and weathered before the ice-sheet took them up. It is by no 
means improbable that the flowing ice incorporated in its current vast 
banks of sand and gravel in Canada, with pebbles already worn and 
weathered, and brought them across the Erie basin to the valley of the 
Ohio without much abrasion. 
il. Prf'liiniiiary Notes on the Columbia Dejjotsits of the Susquehan na . 
H. B. Bashokk. The sand and gravel terraces of this valley in the vi 
cinity of Harrisburg, about 130 feet above the river, are shown to be due 
to river floods from the ice melting, not being indicative of subsidence 
of the valley. 
42. Pre-Camhrian Baseh'reUiKj in the Northventern Staten. C. W. 
Hall. The records of deep well Iwrings to the Algonkian and Archean 
rficks show that they had been more or less fully baseleveled, with de- 
nudation to an approximately plane surface, cutting across the stratifi 
cation and folds, before the deposition of the overlying Cambrian and 
later rock formations. Maps and sections have been drafted according 
to the records of the present subterranean contour of this Pre-Cambrian 
lienejjlain. 
Geological Papeks in Section H (Anthropology). 
Human ReMcn from the Drift of Ohio. E. W. Claypole. Speci- 
mens were exhibited which were regarded as proof of the presence of 
man in Ohio during the Ice Age, having been found near New London, 
Huron county, at depths ranging down to 22 feet from the surface, 
in gravel deposits that apparently can not have been disturbed since 
glacial times. This i)aper will be published in an early number of the 
American Geologist. 
Fresh Oeolotjical Evu/eiice of Glaeial Man oi Trenton, New Jersey. 
G. PREnEiiiCK Wkight. During last May, under the direction of Mr. 
Ernest Volkj a portion of the surface of the glacial sand and gravel ter- 
race in the Delaware valley at Trenton, N. J., was dug over in the pres- 
ence of Prof. Wright, for the sake of testing and demonstrating the 
•succession of the stone implements described by Dr. C. C. Abbott in 
this gravel. The section explored began at the edge of the bluff on the 
Lalor farm, about one mile and a half from the center of Trenton, 
where it is about 50 feet above the river. A trench three feet deep and 
three or four feet wide was dug back from the edge about 30 feet, and 
all the material excavated was carefully examined. The upper foot of 
material was darkly colored with vegetable mould, and had evidently 
l»(H'n disturbed. In this there were numerous implements and chips of 
Hint and jasper, and an occasional piece of argillite: but in the lower 
