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The mineralogy and genesis of three recently discovered saproiite sites of the Appalachian region of Canada were compared. The sites are near Mont Jacques-Cartier (Quebec), Big Bald Mountain (New Brunswick), and Cape Breton (Nova Scotia). Although in all three sites the bedrock has been strongly weathered, the degree of weathering varied widely. There were no weatherable minerals left in the clay fractions of the Mont Jacques-Cartier site down to a depth below 3 m, but large amounts of weatherable minerals still remain in the clay fraction of the Chorizon of the Big Bald Mountain site less than 50 cm below the surface. Even' for the least weathered Big Bald Mountain site, chemical alterations of the bedrock were detected 17 m below the rock surface. Three probable reasons are discussed for the wide range of degree of chemical weathering among the saproiite sites. There are: the rate of erosion, the nature of the bedrock, and the degree of modification by glacial ice sheets.

Mineralogy and genesis of saproitte and strongly weathered soils in the Appalachian region of Canada