i88 GEOLOGICAL SURVEY OF NEW JERSEY. 



in connection with such areas, which latter were also coincident 

 with the distribution of several of the species. In one locality, 

 about a mile north of Englishtown, the road passes through 

 quite a deep cut, in a sand hill of considerable extent laterally 

 and vertically. On this hill is a conspicuous growth of Pinus 

 rigida and Diospyros Americana^ although they seem to be 

 entirely absent elsewhere in the immediate vicinity. Continuing 

 on towards Freehold, some of the species which were but sparsely 

 represented before may be noted as becoming more prominent, 

 and then a marked change occurs as soon as the border of the 

 marl belt is crossed. In place of an almost universal deciduous 

 vegetation, patches, of Piims rigida become conspicuous features 

 until the marl area at Farmingdale is reached, when the pines 

 disappear and are not again met with until the area is crossed. 

 By this route it may be seen that the entire width of the tension 

 zone is crossed, where the relations of the two floras are most 

 complicated. 



Another interesting locality is the vicinity of Perth Amboy, 

 where the Terminal Moraine extends southward beyond the 

 Triassic border, and encroaches for a short distance onto the 

 Cretaceous area. The deciduous flora, which elsewhere is 

 coterminous with the Triassic border, is here carried beyond, to 

 the edge of the Moraine, where it is in sharp contrast with the 

 coniferous trees of the tension zone, which here find their most 

 northern limit in the state. 



At many other localities in or near the tension zone similar 

 facts may be noted, but the above instances are probably suffi- 

 cient for purposes of illustration. 



As examples of the areal distribution and limitation of species 

 the following may be taken as specially interesting : 



Tsuga Canadensis. More or less abundant in the deciduous 

 zone, especially in hilly regions along the borders of streams. 

 Not recorded south of the tension zone, except indefinitely, as 

 very rare, in Monmouth and Ocean counties. New Egypt, 

 Vincentown and Burlington are the only exact localities known 

 to me south of the Triassic border, and these three localities are 

 all within the tension zone.* 



Pinus Strobus. Frequent in the deciduous zone, often form- 



• Note by Statb Geologist: Reported, below Sharptown, on Salem creek, Salem county, <t 

 grove of thirty large trees. Charles R. Lippincott, 



