24 



NEW YORK STATE MUSEUM 



Between Trenton and Holland Patent the disturbance has 

 manifested itself chiefly as a sharp anticlinal fold with a steep 

 western front accompanied by comparatively slight faulting. The 

 above figure shows the condition of things here according to 

 the writer's conception. 



According to Darton 1 normal faulting has been the principal 

 cause of the displacement and as a result of slipping, the Utica 

 shales, on the downthrow side, haA'e been bent upward while the 

 limestone beds on the upthrow side have been bent downward. 

 According to him the upper Trenton has been sharply faulted 

 against the Utica, the amount of displacement being possibly as 

 much as 60 feet. A careful study of the limestone-shale contact 

 has failed to reveal any such sharp or extensive faulting as sug- 

 gested by Darton. According to the writer the steep dips of the 

 limestone and shale are due entirely to the development of an anti- 

 cline whose western limb is very steep and sometimes nearly ver- 

 tical so that it approaches the overturned type. As a result of 

 the folding and later removal of shale by erosion the limestone 

 beds do appear displaced or raised above the level of the shale 

 The difference in level is often 40 to 60 feet as Darton suggests 

 but it is not due chiefly to faulting. 



If the lateral pressure which formed the anticline had continued, 

 a typical overturned fold and finally a thrust fault would have de- 

 veloped. As it is, the only evidence of faulting is within the body 

 of the limestone itself, near the shale contact, where small thrust 

 faulting may occasionally be seen. All along the line between Hol- 

 land Patent and Trenton the harder, more resistant limestone beds 

 stand out as a low sharp ridge while the softer shales on the west 

 have been worn down. 



In the vicinity of Prospect station ij miles southwest of 

 Prospect there is also abundant evidence of disturbance. Here, 

 however, upper Trenton limestones only are present. Along 

 the small streams just north of the station they are seen to 

 be strongly folded, in one case the limestone beds standing in ver- 

 tical position. Also to the west of the station in the bed of Cin- 

 cinnati (Town Line) creek the limestone beds are much disturbed 

 by folding. In this vicinity some minor faulting has been noted 

 although for most part the disturbance shows itself in the folding. 



Between Prospect station and Prospect village the country is 

 deeply drift-covered, while at Prospect occurs the principal dis- 

 turbance visible along the line. A thrust fault of considerable 



1 Op. cit. p. 52-53- 



