56 Quaternary Formations of Southern New Jersey. 



Clarksburg hills, and to have flowed through Prospertown, 

 Archers Corner, and thence to the sea, as now. Ivanhoe Brook, 

 which heads north of Prospertown, is perhaps the original head of 

 Bordens Mill Branch, but it is now the head of Lahaway Creek, 

 tributary to Crosswicks Creek. In Bridgeton time, the drainage 

 probably went from Clarksburg! south by way of Ivanhoe Brook, 

 Prospertown, and Colliers Mills, to Toms River. When Cross- 

 wicks Creek cut across the marl highland at Cream Ridge, and 

 entered the region of Hornerstown and New Egypt, the drainage 

 of Lahaway Creek and Ivanhoe Brook was diverted to the Dela- 

 ware. The gravel west of Colliers Mills at an elevation of about 

 200 ± feet, was probably deposited by the stream which followed 

 the course of Bordens Mill Branch in Bridgeton time, when the 

 drainage from the Clarksburg region flowed to Toms River. 



The gravel west of Colliers Mills is of local trashy material 

 derived from the Beacon Hill and Cohansey formations. It 

 contains nothing which can be referred confidently to the Cre- 

 taceous. The streams of the time had not yet cut through the 

 Miocene of the Clarksburg region, and so had not access to 

 older formations. 



HIGH EEVEE GRAVEL AT HEAD OE WOODS. 



From Head of Woods southeast to Whitings, there is a series 

 of hills ranging from 160 to 200 feet in height, along the divide 

 between Toms River on the one hand, the Rancocas and Cross- 

 wicks creeks on the other. Just south of Colliers Mills, at Head 

 of Snag, there is a gap in this divide, at the 130-foot level. This 

 4 is probably part of a valley occupied by a stream for a con- 

 siderable time after the epoch of Bridgeton deposition. It is 

 probable that the drainage from the vicinity of New Egypt, 

 and possibly from the vicinity of Jacobstown, once went east- 

 ward by Head of Snag to Toms River, and that the drainage 

 did not assume its present course until long after the Bridgeton 

 formation was deposited. 



At Boyds Hotel, near Whitings, there is a gap in the divide 

 at the 150-foot level. This probably represents a portion of 

 another old valley which extended far to the west or northwest. 



