Dec., 1912.] Ordovician Section, Lake Huron Area. 
37 
THE ORDOVICIAN SECTION IN THE MANITOULIN AREA 
OF LAKE HURON. 
Aug. F. Foerste. 
1. Introduction. 37 
2. Basal beds; red clay shales; Lowville. 38 
3. Swift Current beds; chiefly whitish limestones; Leray. 38 
4. Cloche Island beds; “Black River” limestones. 39 
5. Curdsville and other Trenton exposures on Goat Island. 41 
6. Trenton exposures at Little Current, including Collingwood 
formation. 42 
7. Cincinnatian beds on Manitoulin Island. . 43 
A. Sheguindah beds; Eden. 43 
B. Wekwemikongsing beds; Lorraine. 44 
8. Richmond strata on Manitoulin Island. 45 
C. Waynesville beds, or Lower Richmond. 45 
D. Kagawong beds, or Upper Richmond. 46 
Columnaria reef. 46 
Stromatocerium reef. 47 
Rhytimya and ostracod horizons. 47 
E. Queenstown shales. 47 
1. Introduction. 
During the summer of 1911 and 1912, the writer was given the 
opportunity, by Dr. R. W. Brock, of visiting the Ordovician sec¬ 
tions in the Lake Huron area under the auspices of the Canadian 
Geological Survey. During the first summer he was accompanied 
by Prof. Arthur M. Miller, who made a special study of the 
Mohawkian strata on Cloche and Goat islands, and in the vicinity 
of Little Current, and who gave him the benefit of his extended 
acquaintance with Mohawkian strata, especially in relation to the 
correlation of these strata as exposed in the Lake Huron area with 
those of Kentucky. During the summer of 1911, and during a 
part of 1912, he had also the assistance of Mr. E. J. Whittaker, of 
the Canadian Geological Survey, especially in his investigations of 
the Cincinnatian strata. Mr. Whittaker has since given special 
attention to the Cincinnatian strata in the vicinity of Meaford, 
and some of his observations are here incorporated. The notes 
here presented are merely preliminary to a more extended study 
of the field. 
As will be noted on the following pages, the writer has had the 
frequent assistance of Dr. E. O. Ulrich, Mr. R. S. Bassler, Prof. 
Percy E. Raymond, Dr. Ruedemann, and others, in the interpre¬ 
tation of the fossil faunas. It will be readily recognized, however, 
that these investigators were at a disadvantage in not being able 
to examine the faunas themselves in the field, since the writer may 
have failed to collect some of the most valuable diagnostic fossils. 
