Three lithologic facies are defined in the Torridonian (Precambrian) rocks of Fladday, Raasay, and Scalpay in the Inner Hebrides, reflecting deposition in three distinctive sedimentary environments, and compared with sections of adjacent areas of the mainland of northwest Scotland. The basal facies is represented by massive or poorly bedded breccias and grits deposited as scree or fanglomerate, the gray facies by shales and sandstones deposited in a shallow-water lacustrine or littoral marine environment, and the red facies by coarse pebbly sandstones and shales deposited in a braided river environment.

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