GEOLOGICAL SECTION OF NEW JERSEY 361 
limestones having a thickness of about 1,000 feet. Those of the Green 
Pond Mountain region are chiefly arenaceous shales, sandstones, and 
conglomerates, carrying comparatively few fossils, and aggregating 
over 4,000 feet in thickness. 
The Helderbergian or lowermost Devonian faunas in New Jersey 
are essentially the same as those in New York, and the same faunal 
zones are recognized. The first formation carrying these faunas is 
the Coeymans limestone. 
Coeymans limestone.—In the Nearpass section, the Coeymans 
limestone has an estimated thickness of forty feet, though only the 
lower beds are exposed. It rests conformably upon the Manlius 
limestone from which it differs lithologically in its coarser and more 
crystalline texture and lighter color. Frequently more or less chert 
is mingled with the limestone. The Coeymans fauna is far more 
prolific than that of the Manlius and differs markedly in composition, 
the most characteristic species being Gypidula galeata. A coral bed 
carrying more or less completely silicified masses of Favosites helder- 
bergiae, and a concentrically laminated stromatoporoid occurs in 
the base of the formation. 
Stormville sandstone-—In the southern half of the Wallpack 
Ridge in New Jersey, a thin sandy layer occurs at the top of the 
Coeymans limestone. It is in general an inconspicuous formation 
owing to its thinness and heavy deposits of glacial drift. It becomes 
more conspicuous toward the south and according to White! it 
gradually replaces the overlying calcareous and shaly strata until it 
occupies the entire interval between the Coeymans limestone and the 
Oriskany sandstone. It has not been recognized in the Nearpass 
section near Tri-States nor at any point north of Hainesville, N. J. 
New Scotland beds—The New Scotland beds which overlie the 
Coeymans limestone in the Nearpass section consist of about 20 feet 
of a very hard cherty limestone followed by a series of calcareous 
shales, having an estimated thickness of 140 feet. Nowhere in the 
state is there exposed a continuous section of these beds as is the case 
with several of the lower formations. The fauna is a prolific one, 
and is especially characterized by the abundant representation of the 
genus Spirifer. Its differences from the Coeymans fauna are of 
t Second Geol. Surv. Penn., Rep. G 6, pp. 132, 133. 
