FORMATIONS OF ORDOVICIAN AGE. 
174 A2°, Dark, 
174 A**. Dark, 
16 
. Conularia trentonensis (Hall) 
. Harpina ottawensis ( Bill.) 
. Isotelus gigas De Kay 
. Proetus latumarginatus n. sp. 
. Pterygometopus callicephalus (Hall) (r). 
fossiliferous limestone. 
. Dalmanella testudinaria (Dal.) 
. Plectorthis plicatella (Hall) 
. Ctenodonta sp. undet. 
. Protowarthia cancellata (Hall) 
. Hormotoma salteri Ulr. 
. Harpina ottawensis ( Bill.) 
. [sotelus gigas De Kay 
. Bumastus trentonensis (Ermm.) 
. Proetus latimarginatus n. sp. 
. Calymene senaria Con. 
fossiliferous limestone. 
. Prasopora simulatrix Ulr. 
. Strophomena incurvata (Shep.) 
. Rafinesquna alternata (Emm.) 
. Plectambomtes sericeus ( Sow.) 
. Dalmanella testudinaria (Dal.) 
. Zygospira recurvirostris Hall 
. Modiolopsis faba (Con.) 
. Protowarthia cancellata (Hall) 
. LTetranota bidorsata (Hall) 
. Lnospira micula (Hall) 
. Orihoceras tenmstriatum (Hall) 
. Trinucleus concentricus (Eaton) 
13. 
14. 
15. 
Isotelus gigas De Kay 
Bumastus trentonensis (Emm.) 
Calymene senaria Con. 
174 A*®. Dark limestone, sparsely fossiliferous. 
(SS) cab) 
ws 
. Prasopora simulatrix Ulr. 
. Lingula riciniformis Hall 
. Rafinesquina alternata (Emim.) 
. Plectambonites sericeus (Sow.) 
(r). 
(r). 
(c). 
(r). 
(a). 
(f). 
(r). 
(rt). 
(rt). 
(r). 
(f). 
(r). 
(r). 
(r). 
(f). 
(t). 
(c). 
(f). 
(c). 
(t). 
(f). 
(r). 
(T). 
(f). 
(ak 
(G2) 
(Ge): 
(tr). 
(GE). 
. Pterygometopus callicephalus (Hall) (f). 
(r). 
(r). 
(rt). 
(a)e 
25 
9 in. 
I singe 4 10 
