Erratic rocks were recovered by twelve dredge hauls from the Blake Plateau, off the southeastern coast of the United States. Fifty-two percent of the rocks are granitic or granitic gneiss completely foreign to the carbonate Plateau. The presence of the granite is best explained by tree rafting from the Guiana Shield area of northeastern South America. Lack of manganese staining and the unweathered nature of the erratics suggest a Pleistocene age for the rocks.

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