カナダブリティシュコロンビア州中部フォートセントジェームス地域のキャッシュクリークテレーン中の石灰岩からの紡錘虫 Triticites の一新種

概要

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A new species of Triticites, T. douglassi Igo et Adachi is discovered in the Lower Permian limestone in the Cache Creek Terrane of the Fort St. James area, central British Columbia, Canada. Previous American authors reported the occurrence of the Upper Carboniferous and Lower Permian fusulinacean faunas from this limestone and insisted that these faunas indicate close affinity with those of Japan and southeastern Asia and exclude forms known in the typical North American Craton faunas. The present new species is similar to several Triticites species hitherto described from California and characterized by a highly inflated fusiform shell, having three layered spirotheca, very coarse alveolar keriotheca, and development of pseudochomata. We assess that these shell shape and spirothecal structure suggest adaptation to the local sedimentary environments.
国立科学博物館の論文
1998-06-22