Bridgeton Formation — Summary. 17 



the distribution of the Glassboro phase of the formation under 

 discussion, as will be seen later. 



The remnants of the divide mentioned above are among the 

 most conspicuous features of the topography of the Coastal 

 Plain in New Jersey. The hills at Crawfords Corner (nearly . 

 400 feet high) and Clarksburg- are the highest elevations in the 

 southern part of the State. The remnants of the divide farther 

 southwest are lower, but hardly less conspicuous in their sur- 

 roundings. They are seen in the hills near Ellisdale, in Arneys 

 Mount, and other isolated hills between Clarksburg and Berlin. 



If Mr. Knapp's view of the pre-Bridgeton drainage is correct, 

 some idea of the extent to which the former divide has been 

 shifted is made clear by comparing its position, as sketched above, 

 with the present divide between the Delaware and the ocean. 

 The present divide runs from Crawfords Corner, through Free- 

 hold, Smithburg, Carr Tavern, Head of Woods, Woodmansie, 

 Tabernacle, and Berlin, to Glassboro. 



Northwest of the northeasterly portion of this divide, between 

 Amboy and Bordentown, lay a broad lowland, — perhaps a wide 

 valley plain, in pre-Bridgeton time. This lowland or valley is 

 believed to have been continuous with the valley occupying the 

 site of the lower Delaware. This belt is still a lowland, though 

 it has undergone notable changes since the Bridgeton epoch. 

 The view is entertained that it may have been the course of a 

 large stream, perhaps the ancestor of the Hudson River, which, 

 before the Bridgeton epoch and some of the time since, is thought 

 to have flowed southwestward, reaching what is now the position 

 of the Delaware somewhere between Trenton and Bordentown. 

 If this view is correct, the present outlet of the Hudson, through 

 the "narrows," is of later origin. 



In the southwestern part of the State, the Bridgeton remnants 

 have their greatest elevation in the belt of high land extending 

 from Berlin southwestward to Shiloh and Roadstown. West of 

 Bridgeton the base of the formation declines to the southwest- 

 ward, probably much as the divide of that time did. Southeast 

 of the divide, the base declines to the southeast, toward the 

 ocean. Northwest of the divide, the base declines somewhat 



2 QUAT 



