Cape May Formation — Local Details. 189 



ful if the present surface of the terrace represents the original 

 surface of the formation. A little eolian sand mantles the 

 surface at many points. Up the valley the phenomena of the 

 lower part are repeated with such changes in composition of 

 material and height as go with river deposits. Loam mantles 

 the upland back of the terraces, and appears to be continuous 

 with the surface loam of the terraces. 



Some 12 miles up the stream there is a high hill, 181 feet in 

 elevation, capped with Bridgeton gravel, and mantled with glau- 

 conitic loams. Seams of sand are interbedded with the loam, 

 and in some of these seams, more than half the material is green 

 sand. This loam is like that on Arneys Mount (p. — ), and in 

 both cases is far above any present source. Either the glauco- 

 nite has been carried up by wind, or sources which were once 

 higher have been worn away. The former is the more probable. 

 Green loam does not appear at the surface elsewhere in the 

 vicinity. 



Newtons Creek. — Most of the basin of this creek is below the 

 level of the top of the Cape May formation. The low surface 

 is covered with 5 to 10 feet of loam, sand, or gravel. The 

 gravel and sand are chiefly near the streams, and the loam back 

 from them. It is here impossible to separate Cape May material 

 from that of lesser age, in any thorough-going way. 



Big Timber Creek. — In the basin of this creek, the inter- 

 stream areas are higher than in the basin of Cooper Creek, and 

 the valleys are deeper, broader, and more trough-like. The left 

 slopes of the valleys are higher and steeper than the right, though 

 the difference is not as conspicuous as in the valley of the Pen- 

 sauken, and some other creeks. The Miocene hills in the upper 

 part of the basin, and the arenaceous beds of the Cretaceous, 

 give the region a sandiness which does not facilitate the work- 

 ing out of its surface geology. 



At the lower end of the valley the Cape May material extends 

 below sea level. In the vicinity of Westville all the material 

 above sea level is of this age. Farther up the stream the valley 

 narrows, and the formation appears in narrow strips on one 

 or both sides (chiefly on the right) up to Prossers Mills, where 

 it has an elevation of 80 feet at least. Up the North Branch 



