Cape May Formation — Local Details. 175. 



any point above. There are well-defined terraces at points above, 

 with 10 feet of sand and gravel, but to the eastward the forma- 

 tion becomes less and less well defined topographically. On the 

 south side of the stream, the wind-developed ridges of sand 

 persist nearly to Imlaystown, and reach a maximum altitude of 

 more than 120 feet. 



Just above Crosswicks (village) the Cape May formation is 

 disposed as a terrace in the right bank of the creek. Its elevation 

 is 60 feet, and its surface of loam; but exposures and data 

 from wells show that the terrace is of gravel chiefly, alternating 

 with minor beds of sand. In the gravel, quartz and chert are 

 abundant, sandstone and quartzite common, and water-worn 

 pieces of ironstone common to abundant. In other words the 

 materials came from the Cretaceous, the Miocene, and the Pen- 

 sauken formations. 



In the valley of Crosswicks Creek the terraces are fairly 

 definite more than a mile east of the village. Farther up they 

 are feebly developed at most places, though distinct on the east 

 side of the stream above Walnford. The formation rises to 90 

 feet opposite Walnford, above -which point it has little certain 

 development. 



The terraces along both creeks have, as a rule, surfaces of 

 loam, and this extends up above the terraces on both sides of 

 both valleys, and thus constitutes a veneer over terraces and 

 uplands alike. It is clearly not of residual origin. The idea has 

 been entertained that it constituted a formation to be separately 

 recognized, possibly the result of a submergence; but it seems 

 on the whole more probable that it is eolian. This veneer of 

 surface loam helps to conceal the from-stream limits of the Cape 

 May formation. 



At Walnford and for 3 miles below, there is a somewhat 

 ridge-like deposit of glauconitic sand on the left side of the 

 creek. The feeble ridge is somewhat interrupted by tributary 

 valleys, but otherwise persistent. Just west of Walnford, the 

 sand is highly glauconitic, but the proportion of glauconite 

 diminishes toward the Delaware. The sand of this ridge is 

 partially eolian, and locally a very subdued type of dune topo- 



