FORMATIONS OF ORDOVICIAN AGE. 
15. 
16. 
. Trinucleus concentricus (Haton) 
. Harpina ottawensis ( Bill.) 
. Isotelus gigas De Kay 
. Bumastus trentonensis (Emm.) 
174 A*®. Dark, 
© CO -s DD CrP GH Wr 
Cea eS Sa |S. ae 
SMO MORanrKWwW WH OS 
174 A‘, Dark, 
aS oO BP O&O WO FE 
Tetranota bidorsata (Hall) 
Orthoceras sp. undet. 
. Proetus latimarginatus n. sp. 
. Platymetopus trentonensis (Hall) 
. Calymene senaria Con. 
. Pterygometopus callicephalus (Hall) (x). 
fossiliferous limestone. 
. Hindia parva Ulr. 
. Langula sp. undet. 
. Strophomena incurvata (Shep.) 
. Rafinesquina alternata (Emm.) 
. Plectambonites sericeus (Sow.) 
. Dalmanella testudinaria (Dal.) 
. Plectorthis plicatella (Hall) 
. Zygospira recurvirostris (Hall) 
. Clenodonta sp. undet. 
. Cleidophorus neglectus Hall 
. Protowarthia cancellata (Hall) 
. Bucania punctifrons Emm. 
. Eccyliomphalus trentonensis (Hall) 
. Trinucleus concentricus (Katon) 
. Isotelus gigas De Kay 
. Bumastus trentonensis (Kmm.) 
. Proetus latimarginatus n. sp. 
. Cyphaspis trentonensis n. sp. 
. Calymene senaria Con. 
. Pterygometopus callicephalus (Hall) (£). 
fossiliferous limestone. 
. Strophomena incurvata (Shep.) 
. Dalmanella testudinaria (Dal.) 
. Plectorthis plicatella (Hall) 
. Zygosmra recurvirostris (Hall) 
. Ctenodonta sp. undet. 
. Cyrtodonta sp. undet. 
(r). 
(r). 
(7). 
(f). 
(f). 
(f). 
(f). 
(r). 
(r). 
(f). 
(r). 
(T). 
(Tr). 
(T). 
(f). 
(f). 
(T). 
(T). 
(r). 
(f). 
(f). 
(r). 
(Tr). 
(r). 
(f). 
(T). 
(Tr). 
(f). 
(f). 
(f). 
(f). 
(f). 
(f). 
(r). 
31 
Aliauiey Tava, 
ft. (67 1me 
