PART. I CHAZYAN AND RELATED BRACHIOPODS—COOPER 25 
southern Lennox and Addington County, Ontario, but is overlapped to the west. 
Brachiopods are: 
*Dalmanella rogata (Sardeson) = Paucicrura rogata (Sardeson) 
Doleroides ottawanus Wilson 
D. pervetus (Conrad) 
*Hesperorthis tricenaria (Conrad) 
Rafinesquina alternata (Conrad) 
Rhynchotrema sp. 
*Sowerbyella curdsvillensis (Foerste) 
Strophomena sp. 
Napanee member of Rockland formation—This member was named by Kay 
(1937, p. 255) after Napanee, Ontario. The member is well exposed in western 
New York and central Ontario. At the type section it is 34 feet of gray-blue, 
medium-textured, heavy-ledged limestone with shaly partings, particularly in 
the lower part. In New York it occurs at all areas having the Selby member, 
but is absent from the Western Canada Creek and Mohawk Valleys except for 
local occurrences at Inghams Mills and Newport Quarry in Herkimer County. 
Westward from Napanee it extends to Peterborough County, Ontario. Still 
farther west it is thought to be represented by the Coboconk limestone. Brachio- 
pods recorded from the Napanee member are: 
Camerella obesa Cooper 
C. volboriit Billings 
Dalmanella rogata (Sardeson) = Paucicrura rogata (Sardeson) 
Hesperorthis tricenaria (Conrad) 
Parastrophina hemiplicata (Hall) 
Protozyga exigua (Hall) 
Rafinesquina alternata (Conrad) 
“R.” inquassa (Sardeson) = Opikina inquassa (Sardeson) 
R. lennoxensis Salmon 
R. olliformis Salmon 
Sowerbyella punctostriata (Mather) 
*Strophomena filitexta (Hall) 
Trigrammaria wilsonae Cooper 
Triplesia cuspidata (Hall) 
SECTION AT COBOCONK, CENTRAL ONTARIO 
In central Ontario Black River—Rockland rocks make a narrow belt extending 
east-west from Kingston to Victoria Harbour on Georgian Bay. Sections studied 
by Okulitch (1939) are located on Highway 35 between Coboconk and Norland. 
Four formations in ascending order are recognized: Shadow Lake, Gull River, 
Moore Hill, and Coboconk. 
Shadow Lake formation.—This basal formation, 18 feet thick, consists of 
unfossiliferous purple and green shales and magnesian limestones or dolomites. 
The position of the formation resting on the pre-Cambrian and the lithologic 
character are suggestive of the Pamelia formation of New York. 
Gull River formation.—Compact, light-gray, aphanitic limestone, 45 feet 
