FORMATIONS OF ORDOVICIAN AGE. 4 
Or 
. Strophomena incurvata (Shep.). 
. Plectorthis plreatella (Hall). 
. Platystrophia biforata (Schl.). 
. Dalmanella testudinaria (Dal.). 
. Zygospira recurvirostris (Hall). 
9. Hormotoma salteri Ulr. 
10. Bumastus trentonensis (Emm.). 
11. Bronteus lunatus Bill. 
This fauna seems to represent nearly the same horizon as the last, 
but in the absence of Parastrophia hemiplicata, may, perhaps, be con- 
sidered as having come from a little higher up in the formation. 
Locality 157 A.—Yhis locality is in the roadside just above Mr. 
Wittingham’s house, three miles southwest of Newton.* The Tren- 
ton formation at this point is a highly calcareous shale, like that 
used in the State for the manufacture of Portland cement. The 
species identified from here are as follows: 
1. Prasopora simulatrix Ulr. 
. Rafinesquina alternata (Kmm.). 
. Plectambonites sericeus (Sow.). 
Strophomena incurvata (Shep.). 
. Dalmanella testudinaria (Dal.). 
Zygospira recurvirostris (Hall). 
. Isotelus gigas De Kay. 
. Bumastus trentonensis (Kmim.). 
. Proetus latimarginatus n. sp. 
10. Pterygometopus callicephalus (Wall). 
This fauna was collected from beds in situ, and represents a horizon 
higher in the formation than the Parastrophia hemiplicata zone. It 
may probably be safely placed in the middle portion of the Trenton 
limestone as represented in the Jacksonburg section. 
Locality 156 A.—This locality is on the same line of outcrop as 
the last, and about one mile to the southwest.t The following species 
have been identified : 
1. Receptaculites occidentalis Salter. 
. Streptelasma corniculum Hall. 
. Rhimdictya sp. undet. 
. Inngula sp. undet. 
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. Rafinesquina alternata (Kmm.). 
* See locality 15, Map No. 18, p. 80, Joc. cit. 
t Locality A, Map No. 18, p. 80, loc. cit. 
