16 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
the vicinity of Ottawa. The sands thin eastward while the limestones thin to 
the west. 
St. Martin formation—Dr. A. E. Wilson (1946a, p. 17) selected Cap 
St. Martin as the type section of the St. Martin member of the Aylmer forma- 
tion. This type section is not far northwest of Montreal, and St. Martin is prob- 
ably thus applicable as a formation name to the Montreal occurrences. Camaro- 
toechia plena is abundant in some layers around Montreal and thus makes 
correlation with the Valcour formation of the New York sequence possible. 
Brachiopods from the St. Martin formation are: 
Camarotoechia plena (Hall) = Rostricellula plena (Hall) 
Clitambonites porcia (Billings) = Ptychopleurella porcia (Billings) 
Dactylogonia sp. 
Glyptorthis transversa Cooper 
“Heberitella’ acuminata (Billings) 
Hebertella borealis Billings = Mimella borealis (Billings) 
H. imperator (Billings) = M. imperator (Billings) 
H. vulgaris Raymond = M. vulgaris (Raymond) 
Lingula belli (Billings) = Palaeoglossa belli (Billings) 
Lingulella cf. L. huronensis Billings 
Plaesiomys platys (Billings) = Multicostella platys (Billings) 
Rafinesquina incrassata Hall 
*Rafinesquinia alternata (Conrad). (Incorrectly identified.) 
Rostricellula raymondi Cooper 
Schizambon duplicimuratum (Hudson) 
Zygospira acutirostris (Hall) = Sphenotreta acutirostris (Hall) 
Pamelia formation.—Okulitch (1936, p. 127) reports a thin equivalent of 
this formation, not over Io feet thick, consisting of dolomite and sandy limestone 
with green shale partings. 
Lowville formation.—This formation consists of 16 feet of gray, thin- or 
thick-bedded limestone weathering dove gray, the layers separated by this shale 
partings. Fossils are common and Okulitch (1935) reports: 
Opikina transitionalis Okulitch 
Rafinesquina grandis Okulitch = Strophomena grandis (Okulitch) 
Chaumont formation.—Under this heading are placed rocks formerly called 
Leray in the vicinity of Montreal. This formation consists of thick beds of dark, 
light-gray-weathering limestone about 23 feet thick. The formation may extend 
to the east to within about 35 miles of Quebec. Brachiopods reported by Okulitch 
(1935) and others are: 
Dinorthis sp. 
Leptaena radialis Okulitch = Cyphomena ? radialis (Okulitch) 
Pionodema sinuata Okulitch = Genus ? 
Rafinesquina alternata (Conrad) = Opikina clara (Okulitch) ? 
. clara Okulitch = O. clara (Okulitch) 
. grandis Okulitch = Strophomena grandis (Okulitch) 
. minnesotensis (N. H. Winchell) = Opikina minnesotensis (N. H. Winchell) 
. transitionalis Okulitch = O. transitionalis (Okulitch) 
. wagnert Okulitch = O. wagneri (Okulitch) 
AAAAD 
