FORMATIONS OF ORDOVICIAN AGE. as) 
_ The fossils secured from this locality were all collected from loose 
blocks of limestone, and doubtless came originally from several dif- 
ferent beds. No representatives of the Black River fauna occur, how- 
ever, although both lower and upper Trenton species, such as Orthis 
tricenaria and Platystrophia biforata, are recorded. The locality is 
a promising one—the fossils being abundant and well preserved—and 
a careful study of the section, similar to that made at Jacksonburg, 
would undoubtedly shed light on the faunal succession in the New 
Jersey Trenton limestone. 
Locality 79 B.—The next locality hes just a quarter of a mile east 
of Beaver Run, on the western side of the fault line, which 1s there 
present.* The following species have been recognized: 
1. Prasopora simulatria Ulv. 
2. Plectambonites sericeus (Sow.). 
3. Strophomena incurvata (Shep.). 
4. Dinorthis pectinella (mim.). 
»). Bumastus trentonensis (Emim.). 
6. Calymene senaria Con. 
This fauna undoubtedly represents the lower Trenton horizon. The 
presence of Dinorthis pectinella and the abundance of Plectambonites 
sericea, with the absence of Dalmanella testudinaria, are its distinctive 
lower Trenton features. 
Locality 75 A.—tying about three-fourths of a mile nearly due east 
from Branchville+ is one of the most interesting fossiliferous Trenton 
localities in the State, because, in the Hudson River shales, a short 
distance above the lmestone, an interesting graptolite fauna occurs. 
The Trenton fossils which have been collected at this locality are 
as follows: 
1. Streplelasma corniculum Hall. 
2. Nyctopora billingst Nich. 
Prasopora simulatriv Ulr. 
4. Monotrypa sp. undet. 
Or 
Callopora sp. undet. 
6. Orbiculoidea lamellosa (Wall). 
Orbiculoidea? sp. undet. 
8. Crania sp. undet. 
9. Rafinesquina alternata (Emi.). 
10. Plectambonites sericeus (Sow.). 
*See Map No. 15, indicated in the previous footnote. 
+See Map No. 7, p. 52, Ann. Rep. State Geol. for 1900. 
