FORMATIONS OF SILURIAN AGE. - 67 
The lower strata of the formation, 2 A® to 2 A‘, inclusive, or all 
the beds up to the red limestone, are particularly characterized by 
the species which has been described as Chonetes jerseyensis. All 
of these beds which are fossiliferous at all, carry essentially the same 
fauna, and this life zone may be designated as the Chonetes jerseyensis 
zone. 
,The second faunal zone is essentially restricted to the red lme- 
stone bed 2 A’. The fauna of this bed has a character of its own, 
distinct from that of either the subjacent or superjacent strata—it 
being characterized by the large number of specimens of the bryozoan, 
Ptilodictya frondosa. The name of this species may be used for the 
designation of this faunal zone. In an earlier, preliminary report 
on these faunas* the writer identified this species with an Ohio 
species, Ptilodictya platyphylla Jas., which is, in reality, a member of 
the genus Phenopora, but a microscopic study of the specimens has 
shown this identification to be incorrect, and has shown that the 
New Jersey specimens belong to an hitherto undescribed species. The 
earlier designation of this zone, then—Ptilodictya platyphylla zone— 
has to give way for the name Ptilodictya frondosa zone. 
The beds lying above the Ptilodictya frondosa zone, up to and 
including 2 At, are not characterized by one homogeneous fauna, 
although they are characterized throughout by the species Atrypa? 
Jamellata, and may, therefore, be designated as the Atrypa lamellata 
zone. ‘There are really three subzones here included—the first, or 
lower one, having its fauna typically represented in bed 2 A’; the 
second, in bed 2 A’, which is characterized by the great abundance 
of corals, and may be called the coralline zone, and the third, in 
bed 2 A*®, characterized by the abundance of members of the ostracode 
genus Beyrichia, may be called the Beyrichia zone. 
In most cases the Decker Ferry faunas, in whatever localities they 
have been found in the State, may be definitely referred to one or 
the other of these faunal zones recognized in the Nearpass section. 
Locality & A—On the next farm south of that upon which the 
William Nearpass quarry is located, and in a southward continuation 
of the quarry bluff, the lower Decker Ferry beds are exposed. The 
following species of fossils have been identified from here: 
1. Favosites sp. undet. 
2. Monotrypa corrugata n. sp. 
*Ann. Rep. State Geol. N. J. for 1899, p. 12. 
