214 The Atner lean Geologist October, i89? 
present position by ice. A mile or two further on the cuts are 
shallower, and an admixture of coarser material is observed,^ 
though the red gravel continues. Angular fragments of eruptive 
diabase from immediately beneath, form a rough floor; well- 
rounded and polished northern quartzites, Oneida and Triassic 
conglomerates, and Triassic red sandstones up to a foot or more 
in diameter are imbedded in the gravel, while the surface for miles 
around is well supplied with these, and with larger, less rounded 
quartzites and conglomerates, up to two and three feet in diame- 
ter. Striated pebbles are very rare, and the whole can be ac- 
counted for, at this low level of 100 feet, by water and floating 
ice, without invoking the aid of an ice sheet. 
In the third category I have placed the two deposits at High 
Bridge and Pattenburg, both at the foot of the southeastern 
slope of Musconetcong mountain; one, where the Jersey Central 
railroad comes across, and the other where the Lehigh Valley 
road comes out of its tunnel. In several particulars they are 
very different from the more northerly deposits, and they well 
merit the special descriptions and emphasis which professor Salis- 
bury has bestowed upon them in his annual report. Whilst they 
are partly stratified and partly unstratified, containing material 
ranging from clay and sand up to bowlders of three and even 
seven feet in diameter, and are plentifully supplied with shale 
fragments with clean and sharp striations, still, on the other hand, 
it is to be noted : 
1. That the material of the deposits is exclusivel}' local. No 
northern rocks could be found. At High Bridge the deposit 
rests in a cradle of gneiss rock in place, and the hard bowlders 
are all gneissic or granitic, not rounded, and may have been 
gathered from the slope which rises 450 feet above. At Patten- 
burg the floor is Triassic shale and conglomerate, but the bowl- 
ders are gneissic, like those that- are to-day creeping down the 
mountain slope on the north. The Hudson River shale and flint}' 
limestones must be counted as local rock, even though no outcrop 
was detected in close proximity to the deposits.* 
*The High Bridge deposit was visited before I had seen the true drift 
material to tiie north of it. The entire absence of any northern element 
cannot therefore be stated quite so confidently for High Bridge as for 
Pattenburg. While the discovery of a single well-identilied northern 
pebble at either place would be of great significance, it could not alter 
the fact that these deposits are in radical contrast with the more north- 
erly ones in the proportion of local material which they contain. 
