FORMATIONS OF ORDOVICIAN AGE. 
The following additional species have been col- 
lected from a loose slab, probably from this 
bed: 
ig 
2. 
3. 
174 A®. Dark, highly fossiliferous limestone in beds from 
Nyctopora billingsi Nich. 
Actinostroma trentonensis n. sp. 
Parastrophia hemtplicata (Hall) 
three to six inches thick. 
it 
2. 
Streptelasma cormculum H. 
Plectambonites sericeus (Sow.) 
(r). 
(c). 
(a) ie 
(us) 
(aa). 
3. Rhynchotremainequivalvis ( Castel.) (rr). 
4, 
Proetus brevimarginatus Nn. sp. 
174 A°°. Dark, fossiliferous limestone. 
174 A**. Dark limestone, with some highly fossiliferous 
. Strophomena incurvata (Shep.) 
. Plectambonites sericeus (Sow.) 
. Dalmanella testudinaria ( Dal.) 
. Plectorthis plicatella (Hall) 
. Parastrophia hemiplicata (Hall) 
. Bucania punctifrons Emm. 
. Isotelus gigas De Kay 
. Calymene senaria Con. 
bands. 
te 
. Plectambonites sericeus (Sow.) 
. Dalmanella testudinaria (Dal.) 
. Bucania punctifrons Emm. 
D. 
H= OD © 
Lingula sp. undet. 
Proetus brevimarginatus n. sp. 
174 A**. Dark, fossiliferous limestone. 
il, 
. Rafinesquina alternata (Kmm.) 
. Dalmanella testudinaria (Dal.) 
. Plectorthis plicatella (Hall) 
. Bucania punctifrons Emm. 
. Hormotoma salteri Uly. 
. Isotelus gigas De Kay 
Mm Go Ot H OC ww 
Strophomena incurvata (Shep.) 
. Proetus latimarginatus n. sp. 
(Gas)? 
(1). 
(aa). 
(T). 
(r). 
(c). 
(r). 
(ae 
(ig) 
(1). 
(aa). 
(c). 
Gy 
(ae) 
(r). 
(c). 
(aa). 
(1). 
(ie): 
(ae). 
(@)). 
(f). 
23 
3 ft. 
9 in. 
