48 NEW YORK STATE MUSEUM 



of large numbers of quartzite and sandstone pebbles is likewise 

 difficult of explanation, unless it be supposed that faulting has 

 eliminated the quartzite and sandstone layers, as well as the lime 

 stone strata which supplied the large boulders sometimes found, 

 and brought the Newark beds into their present position. 



West of Stonypoint the boundary line makes an abrupt bend 

 to the southeast till it reaches the Hudson river. The older rock 

 is limestone. The adjoining Newark conglomerates are composed 

 chiefly of limestone, and dip away from the older rocks, their trend 

 being parallel to the contact line. One of the best exposures oc- 

 curs in the railroad cut just south of Stonypoint. In this region 

 the sedimentary beds undoubtedly rest undisturbed on the older 

 rocks and are true basal conglomerates. By this I do not mean to 

 imply that they are necessarily the time equivalents of the basal 

 conglomerates exposed in the lower part of the Stockton beds 

 near Trenton and Stockton in New Jersey. They probably are 

 somewhat younger than these, but they are the bottom beds in 

 this vicinity and lie directly on the deeply eroded edges of older 

 rocks. Unfortunately the broad waters of Haverstraw bay con- 

 ceal many interesting stratigraphic points and forbid positive 

 identification with beds farther south. 



The boundary fault apparently does not terminate at the point 

 where the Newark beds turned away from it. Both topography 

 and geologic structure suggest that it continues northeastward 

 across the Hudson river and along the valley of Peekskill Hollow 

 creek north of Peekskill, but its extent in this direction has not 

 been worked out. 



Eastern border. The relations of the Newark beds to the 

 older rocks on the north and northwest, have just been de- 

 scribed in connection with the discussion of a fault along 

 that border. On the east they are bordered by the Hudson. 

 Across the river the rocks are slates, schists and gneisses. 

 The junction of the Newark and pre-Newark beds lies 

 somewhere in the bed of the river. The fact that the 

 lowest observable strata always dip away from the older rocks, 

 suggests that they rest directly on the latter. In New Jersey 



