Note 93 — OBSERVATIONS ON THE MINERALOGY AND GEOLOGY OF A PART OF THE UNITED STATES WEST OF THE MISSISSIPPI.
Reading edition
The banks of the river Montmorenci, from the natural steps downward to the St. Lawrence, are composed of a lime slate placed in horizontal strata from the depth of five to twenty-four inches, each connected by fibrous gypsum of a whitish colour. Heriot's Travels, p. 88. The island of Cape Breton abounds in sandstone, coal, and plaster. Ibid. 431.—James.