Abstract

The Gazelle formation in the Klamath Mountains is a eugeosynclinal suite of rocks from which well-preserved Silurian brachiopods and trilobites were discovered. A faunule containing the trilobites Leonaspis (Acanthalomina) minuta (Barrande), Dicranopeltis cf. C. decipiens (Weller), Trochurus sp. indet., Scutellum sp. indet., Proetus sp. indet., Cheirurus cf. C. insignis Beyrich, Encrinurus (Cromus) beaumonti (Barrande) is described. Encrinurus and Proetus are the only genera previously reported from the western states. Leptaena rhomboidalis Wilckens?, Atrypa reticularis Linnaeus var. orbicularis Sowerby?, Atrypella scheii (Holtedahl)?, and Gypidula sp. are brachiopods from this faunule. Gazelle trilobites are very closely related to the classical Bohemian fauna and some are conspecific. In addition the brachiopod assemblage more closely resembles the Alaskan and Asian faunas than those of the Great Basin and eastern North America.

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