加拿大不列颠哥伦比亚东北部伊维湖地区几维特阶斯雷夫波音特组的层孔虫

Stromatoporoids from the Slave Point Formation(Givetian) at Evie Lake, NortheasternBritish Columbia, Canada

本文描述采自泥盆系几维特阶斯雷夫波音特组石灰岩的层孔虫9属11种,标本为石油天然气钻孔的礁相岩心。石灰岩多为砾状灰岩及粒泥状灰岩,被沥青质充填,微细构造保存完好。层孔虫以穹状及枝状为主。本动物群中的Trupetostroma warreni,Stachyodes thomasclarki,S.spongiosa以及Actinostroma cf.clathratum均与天鹅山生物确相同,而以出现Actinostroma whiteavesii及Pseudotrupetostroma vitreum为明显特征。后一种以及Taleastroma logansportense种一块保存完好的标本,说明此动物群与波兰及美国俄亥俄山谷地区的几维特期动物群的关系密切。

Eleven species of stromatoporoids are described from a core of the reef facies logged as Givetian Slave Point limestone of mostly rudstone and packstone extensively infiltrated by bitumen which locally preserves microstructures well. Domical and dendroid growth forms predominate. The fauna has species of Trupetostroms (T. warreni), Stachyodes (S. thomasclarki, S. spongiosa) and Actinostroma (A. cf. clathratum) in common with the Swan Hills reefs. It is particularly characterized by the distinctive Actinostroma whiteavesii and Pseudotrupetostroma vitreum. The latter species and a well preserved specimen of Taleastroma logansportcnse indicate affinity with Givetian faunas from Poland and the Ohio Valley region.