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Study of Triassic Tethyan fauna between Japan and U.S.A. -Comparative study between Japan and Pacific coast of U.S.A.

日本与美国三叠纪特提斯动物群研究-日本与美国太平洋沿岸的比较研究

基本信息

批准号：
04045042
负责人：
TAMURA Minoru
金额：
$ 2.82万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

Tethyan relationships were confirmed by our studies on many bivalves and corals from Sambosan Terrane in Japan as well as from North American exotic terranes. The affinities between Tethyan faunas from Sambosan Terrane and North American exotic terranes, however, was not found here, except for only one conspecifie coral. Two provinces allowed some Tethyan components to move into each province but not close enough to allow some emmigration each other paleogiographycally.The results are stated more precisely as following. Bioclue study (by Tamura) be-longing to the Inner Kochigatani fauna.1. Newton and others (1987) reported several Japanese species from Hells canyon formation Wallowa Mts.. These results were not confirmed by Tamuras comparative study between American and Japanese species. In conclusion no species of Upper Triassic bivalve are co-existent.2. Trigonids have affinities with these of Chinese and Japanese S. E. Asia. This Trigonids assemblage is characterized by Gruenewald, … More Prorotrigonia and Kyushutrigonia (n. gen.) On the other hand American Trigonian province is characterized by Myophori-gonia.Coral study (by Stanley)a) The comparative syoteniative study revealed the prosence of 17 species from Japan as follows.b) Little can be said on paleoecology, since the corals occur in limestone pebbles and clasts of Olistostromal deposits.c) The Japanese corals have a strong Tethyan composition 53% of the species are con-specific with those of the Tethys. Four of these cooccur in South China. There is a high percentage of endemic species (40%) which are not known outside Japan. A small component of the fauna (1%) occurs in Timor.d) Species are a mixture of Carnian and Norian-Rhaetian ages. Most of the Carnian species occur at the Koguchi and Wasabidani localities. Coral from the Mizukami-goe locality is all Norian-Rhaetian species.e) Twenty coral species from the American Wallowa terrane produce percentages similar to Japan : 55% Tethyan species, 40% endemic, and 5% Timor. However there is nearly complete dissimilarity with corals from Japan. Less

我们对日本三宝山地体和北美外来地体的许多双壳类和珊瑚的研究证实了特提斯人的关系。然而，除了一种同种珊瑚外，这里没有发现三波山地的特提斯动物群与北美外来地的亲缘关系。两个省允许一些特提斯人进入每个省，但在古地理上没有足够的距离允许一些移民相互迁移。结果更精确地表述如下。（田村）内高枥谷动物群的生物线索研究。Newton等人（1987）报道了几种来自瓦洛瓦山地狱峡谷地层的日本物种。这些结果没有得到tamura对美洲和日本物种的比较研究的证实。综上所述，上三叠统双壳类不存在任何种共存。三角类与中国和日本东南亚的三角类有亲缘关系。该Trigonids组合以Gruenewald、More proorotrigonia和Kyushutrigonia （n. gen.）为特征。另一方面，美洲Trigonian省以myophorii -gonia为特征。珊瑚研究（Stanley）a)对比研究显示，日本有17种珊瑚。c)日本珊瑚具有较强的特提斯成分，其中53%的种类与特提斯珊瑚具有相同的特异性。其中四种发生在中国南方。有很高比例的特有物种（40%）在日本以外不为人所知。动物群的一小部分（1%）出现在帝汶。d)物种是卡尼亚和诺里亚-雷提亚时代的混合体。大多数卡尼亚种类出现在小口和Wasabidani地区。Mizukami-goe地区的珊瑚都是Norian-Rhaetian品种。e)来自美洲瓦洛瓦地的20种珊瑚产生的百分比与日本相似：55%的特提斯物种，40%的特有种，5%的帝汶。然而，与日本的珊瑚几乎完全不同。少