298 Lower Helderberg Rocks of Port Jervis, etc. 



The two points of importance and novelty in this Port 

 Jervis section are, the peculiar character of the beds termed 

 (2), and the fossiliferous layer (5c) at the top of the Upper 

 Pentamerus. The division called 2, for which I suggest 

 provisionally the name of Favosite Limestone, is full of 

 corals, principally Favosites, many of which are very mas- 

 sive. Small spheroidal coral la are abundant also. Eminent 

 geologists question the correctness of the horizon that I have 

 assigned to this member, as soon as they look over a collec- 

 tion of its contents. It is at once believed that such specimens 

 must be from the equivalent of the "Coralline Limestone" 

 at Schoharie ; and the most abundant Favosites resembles 

 F. Niagarensis. But an examination of the table will show 

 that any other than a Lower Helderberg horizon for this Port 

 Jervis limestone is simply impossible. The resemblance of 

 the coral-bed of this locality to the one at Schoharie is in its 

 corals only ; the other fossils described in Vol. 2, N. Y. Palae- 

 ontology, as belonging to the "Coralline Limestone" at Scho- 

 harie, are unknown here. Some of the corals are very large. 

 One, a Favosites Helderbergia, is dome-shaped or plano- 

 convex, fourteen inches in horizontal diameter and live in 

 height. The corallites in this species are very uniform in 

 size, and curve very regularly towards the outer surface ; 

 but most of the specimens are irregular in form, and in the 

 direction and size of the corallites. There are many small 

 spheroidal coralla also, in one of which I detected the two 

 rows of minute mural pores characteristic of F. J¥iagarensis. 



The lower layers of this bed have thin, shaly partings, 

 similar to those of the rock below, (1) ; the upper portion 

 is a coarse, brecciated limestone, shunned by lime-burners, 

 and contains, besides the corals and stromatoporse, a great 

 abundance of Pentamerus galeatus and encrinal fragments. 

 Its fossil contents are not regularly arranged, but seem to 

 have been drifted about bj; the waves. 



I regret that it has not been possible, prior to the publica- 

 tion of this paper, authoritatively to determine the corals 



