Geology of Hudson County, New Jerseij. 



47 



rocks, extending from New Haven northwtird, for one hundred 

 and t\7enty-five miles. These rocks seem identical in their litho- 

 logical peculiarities, their fossils, etc., with the corresponding- 

 beds ill New Jersey, save tliat they dip in the opposite direction. 

 Viewed as a whole, many converging lines of proof tend strongly 

 to show that these eastern and western areas are portions of one 

 great estuary dejjosit, the central part of which has been up- 

 heaved and removed by denudation. The facts upon which this 

 conclusion is based have been presented at length in a previous 

 paper in the Annals of this Academy.* 



The abrupt manner in which the stratified rocks are broken 

 off, as shown in the bold line of cliffs on the western bank of the 

 Hudson, — the strata dipping N. W. 15°, — would indicate that the 

 arch must once have been complete, and that the Triassic beds 

 formerly extended far to the eastward of their present limit. The 

 section seen on the bank of the Hudson at Day's Point, two 

 miles above Gastle Point, is shown in the following diagram : — 



Fig. 4. — Section at Day's Point, Weehawken. 



N. W. 



S. E. 



T represents the main trap-sheet forming the hights of Wee- 

 hawken, with its top worn down by glacial action and covered 

 Avith the layer [D) of drift. Beneath the trap, the Triassic 

 slates and sandstones compose the base of the cliff, and extend 

 out over five hundred feet into the river, forming Day's Point, 

 and then breaking off in an abrupt cliff at the water's edge ; 

 the whole series having the usual dip of 15° N. W. The strata 

 immediately beneath the trap are finely stratified slates or meta- 



■ Annals of N. Y. Acad, of Sciences, Vol. I, 1878, pp. 220-254. 



