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

我们对日本桑波桑地体和北美外来物种的许多双壳类和珊瑚的研究证实了特提斯关系。然而，除了只有一种同种珊瑚外，这里没有发现来自桑博桑地体的特提斯动物群与北美奇异地体之间的亲缘关系。两个省允许特提斯成分移入，但在古地理学上不足以允许相互迁移。生物学研究（田村）是对内部Kochigatani动物群的渴望。Newton等（1987）报道了来自于Hells峡谷地层Wallowa Mts.的几个日本物种。这些结果没有得到Tamuras在美国和日本物种之间的比较研究的证实。上三叠统双壳类没有种共存。三角形与中国和日本的S. E.亚洲这个三角形组合的特征是由Gruenewald， ...更多信息 Prorotrigonia和Kyushutrigonia（n. gen.）另一方面，美洲三角省的特点是肌萎缩症。珊瑚研究比较系统的研究揭示了日本17个种的起源如下：B.在古生态学方面几乎没有什么可说的，由于珊瑚出现在石灰石卵石和断基质沉积物的碎屑中。c）日本珊瑚具有很强的特提斯成分，53%的珊瑚物种是由特提斯组成的。与特提斯河的情况相似其中四个共同发生在中国南方。有很高比例的特有种（40%）是不知道日本以外的。动物群的一小部分（1%）发生在帝汶。d）物种是卡尼和诺里安-雷蒂安时代的混合物。大多数卡尼期物种出现在Koguchi和Wasabidani地区。来自水上越地区的珊瑚都是诺里安-雷蒂安物种。e）来自美国瓦洛瓦岛的20种珊瑚的比例与日本相似：55%特提斯物种，40%特有物种，5%帝汶物种。然而，与日本的珊瑚几乎完全不同。少

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