. of the Eastern States. 253 



the geology of North Carolina,* has briefly described the rela- 

 tions of the Deep and Dan River Triassic areas in that State, 

 and arrived at conclusions which are strikingly similar to 

 those advanced in this paper. The two Triassic areas in North 

 Carolina are separated by 75 to 100 miles of crystalline rocks. 

 The Dan River beds, situated northwestward of the Deep 

 River area, have an inclination of about 34° N. VV. ; while the 

 Deep River beds dip 20° S. E. Prof. Kerr considers these two 

 narrow areas of this formation as the fringing or marginal por- 

 tions of an eroded and obliterated anticlinal. Curiously enough, 

 it is stated that the original thickness of these beds could not 

 have been less than 25,000 feet. This coincidence is very in- 

 teresting to me, as my determination regarding the former ex- 

 tent of the New Jersey and Connecticut areas was reached 

 before Prof. Kerr's account of the North Carolina section 

 came under my notice. 



Note A. — In the southern portion of the Trias, the dip is sotithwestward 

 in the detached areas just east of the Blue Ridge, and extending southward 

 from the Potomac to the Dan River in North Carolina. Eastward of this 

 line, another series of Triassic beds is found, as in New England, with an in- 

 clination to the eastward.- These extend from Mt. Vernon to Richmond, 

 and occur also on the Deep River in North Carolina. 



Note B. — The view here advanced as to the origin of the Variegated Con- 

 glomerate, receives still further support from the fact that most of the ma- 

 terial composing these deposits agrees in its character with that of the rocks 

 forming the ancient shore against which they rest snd from which they 

 must have been derived. Thus at Pompton and Boonton. the conglomerate 

 contains a great many pebbles and boulders of gneiss and associated rocks 

 corresponding with the material of the line of bluffs to the westward. On 

 the Minnescongo Creek, however, we find this deposit largely composed of 

 limestone pebbles, doubtless derived from the beds of the same nature just 

 north of the old shore-line. This limestone formation appears on the Hud- 

 son in the conspicuous white cliffs a short distance above Stony Point. A 

 similar identity between the material of the conglomerate and the rocks 

 from which it must have been derived, may be observed also in New Jersey, 

 where the conglomerate becomes highly calcareous, and on the Potomac, 



* Kep. Geol. of North Carolina, Vol. 1, page 141. 



