Abstract
An unweathered granite specimen of the intrusive phase was collected from the southeast side of Lundy, a small island in Bristol Channel. K-Ar and Rb- Sr isotopic age measurements were made on separate biotite, a representative sample of whole rock, and a slate sample from Lundy. The K-Ar and Rb-Sr ages of the biotite were found to be 52 plus or minus 2 m.y. The problems encountered in the interpretation of the age data are discussed in some detail. It is concluded that the Lundy granite is the most southerly known Tertiary igneous center of the North Atlantic Province. (D.L.C.)
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