豫淮盆地太原组顶部斯威特刺(Sweetognathus)种的分类修正及其地层意义

作者通过对豫淮盆地太原组顶部灰岩中牙形刺的研究,发现Sweetognathus动物群较为丰富,计4属10种,含一个新种:Sweetognathuspraeiranicussp.nov.。其中以Sweetognathus最为繁盛,并对其种的分类进行了修正,将原定的Sweetognathusinornatus的大部分标本归入Sweetognathusmerrilli。根据新的分类,建立了两个组合带,即Sweetognathusmerrilli带和Sweetognathuswhitei-Xuzhougnathusmonoridgosus带。通过与国内外相当牙形刺组合带(带)的对比,初步认为该动物群属中、晚萨克马尔到早亚丁斯克期。

TAXONOMIC REVISION OF CONODONT SWEETOGNATHUS SPECIES IN THE UPPERMOST TAIYUAN FORMATION,YUHUAI BASIN AND ITS SIGNIFICANCE

Abundant Conodont Sweetognathus fauna was discovered in the limestone of the uppermost Taiyuan Formation from the Yuhuai Basin. This fauna contains 10 species of 4 genera (including a new species: Sweetognathusu praeiranicus sp. nov.).Among them Sweetognathus is most abundant. Taxonomic revision was based on this fauna. Most specimens of the Sweetognathus inornatus identified originally were designed to Sweetognathus merrilli. Acccording to the classification of the new taxa, two assemblage zones have been recognized from the Taiyuan Formation, i.e. Sweetognathus merrilli and Sweetognathus whitei-Xuzhongnathus monoridgosus zones. According to the correlation of conodont zones in the Taiyuan Formation of the Yuhuai Basin with other areas,the age of the Sweetognathus fauna was ranging from the middle and late Sakmarian to early Artinskian, Permian.