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 

 to a 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 1*7° 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- 

 grav, 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 

 Psilophijton princeps Dn. ; but in coarse sandstone may be root- 

 lets of Psilophyton. 



The eastern side of Skunnemunk Mountain, to the we.st 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 rod 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. 



