58 



included stratum, occupying, to all appearances, a corresponding 

 position in the general mass of the limestone. This occurs on 

 the Northkill, a little above the village of Bernville, in Berks 

 county: these are the two principal localities at which I have 

 hitherto discovered this coarse, calcareous conglomerate. But 

 I am authorized by my brother. Professor William B. Rogers, 

 the state geologist of Virg'n'a, to meniion, that an equivalent 

 rock prevails in the same relative place in the geological series, 

 at several points along the Kittatinny Valley in that State. 



This cong'omerate imparts interest to all inquiries respecting 

 the date of the disturbances which have elevated our great series 

 of Appalachian rocks, throughout their prodigious range, from 

 Vermont to Alabama: it distinctly implies that the shores of the 

 Appalachian ocean were agitated at the early epoch at which 

 the limestone was produced, by a movement sufficiently violent to 

 shatter and convert into pebbles some of that rock already 

 deposited. 



The facts above adduced, prove, also, that, though apparently 

 sudden and of short duration, this convulsion of the limestone 

 ranged, if not uninterruptedly at least at intervals, far to the south- 

 west, along the same line of ancient shore : for it is indisputable, 

 that the general belt of the Highlands, and their prolongation 

 southward, formed the general southeastern coast of the great 

 ancient secondary or Appalachian sea, if not every where at the 

 commencement of these deposits, certainly after the first two or 

 three formations were accumulated. 



The next main axis of elevation beyond that of Jenny Jump, is 

 traceable from near Deckertown southward, passing the villages 

 of Harmonyvale, Lafayette, Newton, and Johnsonburg. Strict 

 continuity of the anticlinal axis between these several points is 

 not, however, clearly established ; and, very possibly, it is rather 

 a succession of two or three coincident axes than one of unbroken 

 regularity: the upheaved belt of limestone containing this chain 

 of axes is itself uninterrupted from the Wallkill, near Decker- 

 town, to Johnsonburg, its northwestern margin; and that of the 

 belts on its southwestern prolongation, at Hope and Belvidere, 

 have been delineated in detail when describing the geographical 

 range of the formation. On the southeast, between this anticlinal 

 belt of the limestone and that which contains the axes of the 



