237 
barrens. If, as seems probable, no very great refrigeration took 
place in the area under consideration" it is within the realm of 
probability that the pine-barren vegetation existing then on the 
Beacon Hill formation, was not very seriously disturbed climatic- 
ally. We have geological evidence. that it was never subjected 
to any deposition of glacial material or over-wash; it contains 
no glacial terraces, for its elevation, perhaps greater then than 
now, precluded this. But the region surrounding Beacon Hill 
was in no such fortunate position. Having only recently 
emerged, comparatively, and boasting only a meager altitude 
it was more or less overrun with the material from the ice. The 
glacial terraces of the lower Delaware, the nature of the material 
deposited near Cape May and in Cumberland County all point 
to a local, or perhaps wide-spread subsidence of the region, 
which, however, did not affect the Beacon Hill formation as far 
as possible glacial influence is concerned. Furthermore, there is 
evidence in the sunken forests at Cape May mentioned above, 
and in the character of the present vegetation,” of the effects of 
the encroachment of glacial material from the north, by way of 
the Delaware Valley. 
If the ice did not affect the pine-barrens geologically so much 
as it did the surrounding country, there seems little doubt that 
it was at this time that many additions were made to the flora 
of that region. All the following species, ranging as they do . 
from the far north to the pine-barrens of New Jersey,” show 
unmistakable evidences of having come down with the glacier, 
19 This is a conclusion warranted ds our knowledge of modern glaciers. While 
the refrigeration must be very great near the source of glaciers it is a well known 
fact that at the "us refrigeration юта greatly, particularly where the 
ice is thin, as it was in all probability near the moraine in New Jersey. It isa 
common п ык of glaciers that plants are found almost up to the edge of 
the ice and sometimes on it. See Muhlenbergia 7: 103, ІІІ, I2I. 1912. 
20 Mr. Stone has collected many plants at Саре May os in the pine- 
and some not known elsewhere south of the “‘fall li 
lower New Jersey (the region of glacial terraces) but unknown in the pine-barrens. 
It is, of course, common northward. See Stone, loc. cit. 93. 
21 Some are now found elsewhére in New Jersey, but, as I have shown above, 
probably because of their subsequent migration from Hill. 
