154 Quaternary Formations of Southern New Jersey. 



hills. Most of these hills range from 150 feet in altitude to 130 

 but the extreme range including Taylors Hill is a little greater 

 (180--120). These various fragmentary deposits might be 

 regarded as of different ages, or, more probably (except on 

 Taylors Hill), as stream deposits made at different levels at about 

 the same time. They may be of Pensauken age, but this is not 

 determinable definitely. Cases in point may be seen I 1 /?, miles 

 southwest of Colts Neck (at 130 and 134 feet), and ty 2 miles 

 south of Colts Neck, at 1 50- feet. 



Below Colts Neck, to Scobeyville and beyond, there are con- 

 siderable areas at 80 to 100 feet, which have a covering of rather 

 recent material, of nondescript character, including some wind- 

 blown sand of recent origin. Judged by its topographic position, 

 this material is older than Cape May, and younger than the hill- 

 top gravels mentioned above and correlated tentatively with the 

 Pensauken. 



It may be noted that Yellow Brook, Swimming River, and 

 Shrewsbury River follow the strike of the Cretaceous beds, and 

 their courses were probably assumed in Pleistocene time through 

 adjustment. 



Between the Swimmiing River Basin and Manasquan River. — 

 The Manasquan valley is nearly at right angles to the valley 

 of Swimming River. Prom its headwaters down to Squankum, 

 the Manasquan has cut through all the overlying beds into the 

 Cretaceous. Below Squankum it flows over beds younger than 

 the Cretaceous. The dip of the beds is therefore greater than 

 the fall of the stream. 



Knapp thinks Willow Brook, now tributary to Swimming 

 River, once flowed southeast, parallel to the Manasquan, reach- 

 ing the sea somewhere in the vicinity of Asbury Park. If this 

 was the case, the Manasquan has held its course, but Willow 

 Brook has been diverted, and the former course of its lower 

 portion is not now evident. The adjustment perhaps did not 

 take place till the streams had cut down to the Cretaceous. Ter- 

 races of Pleistocene material are difficult to recognize in the 

 valley of the Manasquan, because the Pleistocene deposits, de- 

 rived from the Tertiary formations, are very like the latter. 



