1892. ] NEW YORK ACADEMY OF SCIENCES. 147 
possibly of Virginia, and Huntingdon County, Pennsylvania; sub- 
Carboniferous doubtfully of Ohio and Crawford County, Pennsyl- 
vania; possibly in the Lower Devonian of Belgium and Devonian 
of France. 
The writer would acknowledge material assistance from data con- 
tained in the species index of the Division of Paleobotany of the 
U.S. Geological Survey, in compiling the range and distribution 
of the above species. 
It will be seen that there is good evidence for considering the 
three hundred feet of shales and sandstones included between 
Cooley’s quarry, A’, of the section, and the Davidson ‘“ Coal mine 
quarry,” A‘, as of Devonian age. On account of the fragmentary 
nature of the fossil plants it is rather hazardous to attempt any 
close correlation; and yet, after considering the range of the iden- 
tified species, it may be deemed comparatively safe to consider this 
part of the section as of Middle Devonian age. 
About one-half mile east of the Mountain House, on the oppo- 
site side of the ridge, and at about the same altitude as the David- 
son ‘‘ Coal-mine quarry,” is the Bull quarry, which has been worked 
toa considerable extent for flagging-stone. There is very little shale 
in the quarry, and it is composed mostly of the blue sandstone. 
The dip is about 17° to the southeast, and no fossils were found. 
Southeast of the Bull quarry, and sixty feet higher, or about 
1015’ A. T., is a ledge of conglomerate. The pebbles are composed 
of coarse gray sandstone mixed with white or light-colored quartz, 
and are rather angular. 
Above this conglomerate, and up to the steep point back of the 
Seven Springs Mountain House, the coarse gray, with some bluish- 
gray, sandstone appears, alternating with an occasional conglomer- 
ate stratum. No red rock was seen in the section. This point is 
150/ above the first strong conglomerate ledge, or about 550’ above 
Monroe. 
On the eastern side of Skunnemunk Mountain poorly preserved 
fossils were found in the second railroad cut, about one-fourth mile 
north of Woodbury. Most of the rock is the coarse gray sand- 
stone; but near the southern end of the cut is about twelve feet of 
argillaceous, bluish shale, which is somewhat altered by folding, 
and this shale contains fossil plants. Most of the specimens are 
Psilophyton princeps Dn.; but in coarse sandstone may be root- 
lets of Psilophyton. 
The eastern side of Skunnemunk Mountain, to the west of the 
railroad, is very steep, the summit of the first ridge being some 
600’ above the railroad.'’ The rocks as exposed on this slope con- 
sist almost entirely of the coarse gray sandstone, with an occasional 
conglomerate stratum containing white quartz pebbles. Very little 
shale was seen and no red rocks. Farther to the west the moun- 
tain runs up considerably higher. 
1 The elevation of the R. R. station is 443’ A. T., according to Mr. Buchholz. 
