Abstract

A small outcrop of limestone at Limestone Point on the northwest coast of San Juan Island, Washington, has yielded a conodont fauna which includes Neogondolella aff. N tadpole (Hayashi), Neogondolella sp., and Epigondolella aff. E. primita Mosher, an association which suggests a late Karnian age. A single foraminifer specimen collected previously from the deposit was thought to indicate a Middle to Late Permian age. This present study shows that the limestone is much younger. The juxtaposition of fault-bounded deposits of markedly different age and facies suggests that the San Juan Islands are comprised of several geologically distinct allochthonous terranes (Whetten et al., 1978). Conodonts should be of considerable value in distinguishing these terranes.--Journal abstract.

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