54 Quaternary Formations of Southern New Jersey. 



The 229-foot hill at Ellisdale corresponds with Arneys Mount 

 of the preceding section, while the highland at Woodmansie 

 corresponds in some sense with Apple Pie Hill. In keeping with 

 these suggested correspondences, the gravel at Woodmansie is 

 correlated with the Beacon Hill formation, while that southeast 

 of Woodmansie, that at Millville (Ocean County), and that at 

 Barnegat, appear to be younger. 



The top of the hill at Ellisdale is Kirkwood or Cohansey sand. 

 It is below the level at which the Beacon Hill formation would 

 be expected in this immediate region. The base of the Beacon 

 Hill gravel is at 360 to 375 feet above Crawfords Corner, 340 to 

 360 feet at Clarksburg, and 330 feet at Stone Tavern. If the 

 base of the formation continued to decline southwestward at 

 this rate, it should lie at about 300 feet at Ellisdale, and 280 

 feet at Arneys Mount (see p. 51). If the proper elevation for 

 the Beacon Hill gravel at Ellisdale and Arneys Mount be esti- 

 mated from remnants to the southeast, the result is about the 

 same. The Ellisdale Hill is also too low for the Bridgeton in this 

 region, for while the data are imperfect, the restoration of the 

 pre-Bridgeton surface as a plain ranging from 250 feet at Ellis- 

 dale, to 200 feet at Woodmansie and 150 feet at Barnegat, seems 

 to be indicated from such data as bear on the point. 



The Ellisdale-Jacobstown elevations are parts of the old divide 

 between the Delaware drainage and the ocean drainage. The 

 headwaters of Crosswicks Creek have worked back, capturing 

 the tributaries of the streams that formerly flowed to the ocean, 

 and leading them by a circuitous route through the Cream Ridge 

 gap, westward to the Delaware. 



Topographically, the hills at Ellisdale and Jacobstown go with 

 the (Clarksburg hills, and the gravels at Jacobstown are, there- 

 fore, the topographic equivalent of those at Glassboro and 

 Daretown, and are older than the Pensauken formation. 



Though the topographic equivalent of gravels at Glassboro, 

 the gravels of Jacobstown are not arkose, and they contain 

 detritus from the Cretaceous as well as from younger beds. 

 Since the gravel at Jacobstown contains Cretaceous material, it 

 must be assumed that the streams which deposited it (assuming 



