Late Devonian (Frasnian) brachiopods from the Wadleigh Limestone, Southeastern Alaska
Norman M. Savage, Mary E. Baxter
Abstract
Norman M. Savage, Mary E. Baxter
Abstract
A brachiopod fauna from the upper part of the Wadleigh Limestone, Alexander terrane, southeastern Alaska, is of late Frasnian age and includes the new taxaGypidula cornuta alaskensisn. subsp.,Gypidula upatensisn. sp.,Gypidula perryin. sp.,Gypiduloides craigensisn. gen. and sp.,Parapugnax schmidtin. sp.,Westbroekina chaconenesisn. gen. and sp.,Emanuella altusn. sp.,Emanuella neumanin. sp.,Adolfispirifer sanjuanensisn. sp.,Theodossia albertoensisn. sp.,Cyrtospirifer paridaensisn. sp., andTenticospirifer wadleighensisn. sp. A few other taxa are cosmopolitan or conspecific with species known from elsewhere in western North America. The fauna overall may have North American affinities but includes an unusual number of previously undescribed forms. This lends support to the view, based on the affinities of Frasnian conodonts from this same locality (Savage, 1992) and Famennian brachiopods described from nearby (Savage et al., 1978), that these Alexander terrane faunas were not in general communication with Late Devonian North American cratonic faunas to the east.
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A brachiopod fauna from the upper part of the Wadleigh Limestone, Alexander terrane, southeastern Alaska, is of late Frasnian age and includes the new taxaGypidula cornuta alaskensisn. subsp.,Gypidula upatensisn. sp.,Gypidula perryin. sp.,Gypiduloides craigensisn. gen. and sp.,Parapugnax schmidtin. sp.,Westbroekina chaconenesisn. gen. and sp.,Emanuella altusn. sp.,Emanuella neumanin. sp.,Adolfispirifer sanjuanensisn. sp.,Theodossia albertoensisn. sp.,Cyrtospirifer paridaensisn. sp., andTenticospirifer wadleighensisn. sp. A few other taxa are cosmopolitan or conspecific with species known from elsewhere in western North America. The fauna overall may have North American affinities but includes an unusual number of previously undescribed forms. This lends support to the view, based on the affinities of Frasnian conodonts from this same locality (Savage, 1992) and Famennian brachiopods described from nearby (Savage et al., 1978), that these Alexander terrane faunas were not in general communication with Late Devonian North American cratonic faunas to the east.
Key concepts: Terrane, Paleontology, Fauna, Devonian, Geology, Late Devonian extinction, Taxon, Affinities