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Upper Jurassic (Upper Tithonian) radiolaria from the Taman Formation, east-central Mexico.

机译:墨西哥中东部塔曼组的上侏罗世(蒂通河上游)放射虫。

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摘要

Upper Tithonian (Upper Jurassic: Zone 4) Radiolaria of the Taman Formation represent a very abundant and highly diversified Northern Tethyan fauna. Thirteen families (one new), forty-four genera (ten new), and one hundred and seventy-two species level taxa (fifty-six new) are documented herein. Biostratigraphically important taxa present in this assemblage include Acanthocircus dicranocanthos, Vallupus hopsoni, Bivallupus, Parvicingula excelsa, and Perispyridium. The distinctive Jurassic "marker" Perispyridium rapidly decreases in abundance towards the top of Subzone 4 beta and does not occur in Subzone 4 alpha. Curiously, the Taman radiolarian fauna is poor in Mirifusus and completely lacks Ristola altissima, R. procera, Eucyrtidiellum ptyctum, and Sethocapsa(?) cetia, which are common, distinctive upper Tithonian elements elsewhere. This radiolarian fauna is associated with ammonites, calpionellids, and pectenacids. It includes Kossmatia-Durangites assemblage and lower part of Substeueroceras-Proniceras assemblage of Imlay (1980). Furthermore, the base of Zone 4 corresponds closely to the first occurrence of hyaline calpionellids. The radiolarian assemblage is correlated with radiolarian faunas in other areas, such as the Cape Verde Basin (East Atlantic) and Oman. Additionally, a new genus (Loopus, Family Pseudodictyomitridae), described herein from the Taman, bridges the correlation of Tithonian between North America and Japan.; Characteristically, abundant and diversified Vallupinae (Pantanelliidae) occur in the Taman (Zone 4). This subfamily reached its acme of development during late Tithonian. Five genera (two new) and twenty-three species (seven new) of the Vallupinae are illustrated. Because of their distinctiveness, limited range, and wide distribution, many taxa of Vallupinae are useful for global biostratigraphic correlation in upper Tithonian.; Acaeniotylidae, n. fam., is established here to include tuberculate spumellarians common in Upper Jurassic and Lower Cretaceous. Acaeniotylids possess one fragile medullary shell connected to the cortical shell by secondary radial beams; the medullary shell is rarely preserved. Prior to this study, diversified morphotypes had been lumped under genus Acaeniotyle Foreman. Four acaeniotylid genera (three new) are established herein, and sixteen species level taxa (seven new) are illustrated. The proposed taxonomic scheme will aid in understanding the phylogeny and biostratigraphic value of this family.; The following families, illustrated herein, are also common in the Taman (Zone 4): Hagiastridae (three new genera), Patulibracchiidae, Hsuidae, Parvivaccidae, Parasaturnalidae (Acanthocircus), Epitingiidae (Perispyridium), Archaeodictyomitridae, Pseudodictyomitridae (one new genus), Syringocapsidae, Xiphostylidae, and Ultranaporidae (Napora).
机译:上提通盆地(侏罗纪上部:4区)塔曼组的放射虫是北特提斯动物群中非常丰富和高度多样化的。本文记录了十三科(一个新的),四十四属(十个新)和一百七十二个物种级分类单元(五十六个新)。存在于该组合中的具有生物地层学意义的重要分类单元包括棘圆棘、,蛇,双壳狼,细小Parvicingula excelsa和蛇皮虫。独特的侏罗纪“标志物” Perispyridium的丰度迅速向Subzone 4 beta顶部下降,在Subzone 4 alpha中不发生。奇怪的是,塔曼放射虫动物群在Mirifusus处很贫瘠,完全缺乏Ristola altissima,R。procera,Eycyrtidiellum ptyctum和Sethocapsa(ce)cetia,它们是其他地方常见的,独特的上提通系元素。这种放射虫动物区系与炸药,鳞翅类动物和果胶酸有关。它包括Kossmatia-Durangites组合和Imlay的Substeueroceras-Proniceras组合的下部(1980年)。此外,区域4的底部与首次出现的透明cal形虫非常接近。放射虫的聚集与其他地区的放射虫动物群有关,例如佛得角盆地(东大西洋)和阿曼。另外,本文中由塔曼(Taman)描述的一种新属(Loopus,Pseudodictyomitridae科)桥接了北美和日本之间的Tithonian的相关性。典型地,在塔曼地区(第4区)中发生了丰富而多样的Vallupinae(Pantanelliidae)。在提通期末,这个亚科达到了发展的顶峰。画出了五属(Paylupinae)的五个属(两个新)和二十三个物种(七个新)。由于其独特性,有限的范围和广泛的分布,许多瓦卢比纳单元可用于上提通统的全球生物地层学关联。 ca科fam。在这里成立,包括上侏罗纪和下白垩纪常见的具结节孢子虫。棘皮动物具有一个脆弱的髓壳,通过次生径向束与皮质壳连接;髓壳很少被保存。在这项研究之前,Acaeniotyle Foreman属下已将多种形态学集中在一起。本文建立了四个a烯科动物属(三个新科),并说明了十六个物种级别的分类单元(七个新科)。拟议的生物分类方案将有助于了解该家族的系统发育和生物地层学价值。塔曼(第4区)的以下科在这里也很常见:ida科(3个新属),chi科,s科,寄生虫科,副s科(棘皮科),Epi科(Perispyridium),古dict科,假P科(Pseudodictyomitridae)丁香科,剑尾科和Ultranaporidae(Napora)。

著录项

  • 作者

    Yang, Qun.;

  • 作者单位

    The University of Texas at Dallas.;

  • 授予单位 The University of Texas at Dallas.;
  • 学科 Paleontology.; Geology.
  • 学位 Ph.D.
  • 年度 1988
  • 页码 300 p.
  • 总页数 300
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 古生物学;地质学;
  • 关键词

  • 入库时间 2022-08-17 11:50:49

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