1892.] NATURAL SCIENCES OF PHILADELPHIA. 471 



ingtou, a few miles west of Trenton, and Bridgeport, in the valley of 

 tlieScluiylkill, a few miles west of Philadelphia. 



The principal conclusions arrived at by Professor Salisbury are 

 involved in the following extracts. After having minutely described 

 the deposits at Pattenburg, High Bridge, Oxford Church and Little 

 York, N. J., and the excessive oxidation and disintegration which 

 his supposed extra-morainic drift has suffered at these places ; and 

 having expressed the opinion that the phenomena most certainly 

 indicate a glacial period several times older than that with which 

 the terminal moraine is connected, he goes on to say : 



"The phenomena here described as indicating a drift-sheet older 

 than that represented by the moraine and the drift north of it, are 

 not confined to Hunterdon and Morris counties. The extent of 

 the territory over which these phenomena occur is not known, 

 though many facts concerning its extension are already in the pos- 

 session of the Survey. The railway cuts southeast of New Bruns- 

 wick aflbrd similar evidence in this part of the State. Glacial- 

 striated boulders have also been found between Monmouth Junction 

 and Deans, along the line of the Pennsylvania railway, and at 

 Kingston on the Millstone River, three miles northeast of Prince- 

 ton, though they are by no means common m either place. 



" In Pennsylvania there are drift deposits well south of the moraine 

 in similar situations. Glaciated boulders, imbedded in clay which 

 presents the general aspect of till, have been found near South 

 Bethlehem, several hundred feet above the Lehigh River, and at 

 various other points south of the Lehigh, at distances from the 

 moraine comparable to those at which the corres|)onding formation 

 in New Jersey occurs. Drift closely resembling till, and containing 

 striated rock material, occurs on the west side of the Delaware, 

 near Fallsington, three or four miles southwest of Trenton, and, with 

 Mr. C. E. Peet, the writer found similar deposits at Bridgeport, Pa., 

 opposite Norristown, still further south. Bridgeport is the southern- 

 most point at which glacially-striated material has been seen by the 

 writer. Glaciated boulderets were here taken from clay of such 

 character that, were the locality known to have been covered by ice, 

 its reference to till would be fully warranted. Bridgeport is about 

 fifty miles south of the terminal moraine. 



'' It is not intended to convey the impression that every region 

 where glaciated stone maybe found was necessarily once covered by 

 glacier ice. The possibility of transportation of glaciated material 

 beyond the edge of the ice by water, is distinctly recognized. But it 

 is not believed that water alone, or water-bearing glacially-derived 

 bergs, could produce all the results which are here recorded. 

 Neither the structure of the extra-morainic drift, nor its physical 

 make-up, nor its geographic or topographic distribution, is consistent 

 with such an hypothesis. 



