Eller, Eugene Rudy. (1944). Scolecodonts of the Silurian Manitoulin Dolomite of New York and Ontario. The American Midland Naturalist. 32(3): 732-755, plates 1-4.
[From introduction:]
One of the formations which is well exposed along the Niagara escarpment in New York and Ontario is the Manitoulin dolomite, a member of the lower Silurian Cataract or Albion group. In the southern portion of its outcrop the Manitoulin overlies the Whirlpool sandstone; in the northwestern part, it overlies Queenston shales. In both areas it is overlain in turn by shales of the Cabot Head formation.