塔里木盆地和浙江省志留纪长兴矛(秀水矛科,Galeaspida属)的新发现

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Acta Geologica Sinica ‐ English Edition Pub Date : 2024-04-09 DOI:10.1111/1755-6724.15168
Xutong LI, Yumeng ZHANG, Xianghong LIN, Min ZHU, Wenjin ZHAO, Lizhou TANG, Xianren SHAN, Zhikun GAI
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引用次数: 0

摘要

分别在塔里木盆地塔塔尔塔格地层和浙江康山地层发现了新发现的志留纪早期长兴鱼化石--长兴鱼年中鱼和长兴鱼桂。C. nianzhongi与C. gui的主要区别在于:背中央开口呈横椭圆形,长宽比约为3.0;长侧横沟延伸至头盾侧缘;第二侧横沟具有二歧分支。塔塔尔塔格地层年钟鱼和康山地层桂鱼新标本的发现,为这两个地层之间的相关性提供了直接的属级证据,进一步支持了浙西北地区志留系含鱼红层属于志留系下红层而非上红层。此外,作为首次在塔里木盆地发现的长兴鱼,这一新发现将长兴鱼属的古地理分布从华南地块扩展到塔里木地块,为支持这两个地块之间的动物交流以及早志留世时塔里木-华南地块联合的假说提供了新的证据。
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New findings of Changxingaspis (Xiushuiaspidae, Galeaspida) from the Silurian of Tarim Basin and Zhejiang Province, China

New discovery of the early Silurian fossil fish Changxingaspis (Xiushuiaspidae, Galeaspida), Changxingaspis nianzhongi sp. nov. and C. gui, are described from the Tataertag Formation in Tarim Basin and the Kangshan Formation in Zhejiang Province, respectively. C. nianzhongi mainly differs from C. gui in the shape of the median dorsal opening that is transverse elliptic with a width/length ratio of about 3.0, the long lateral transverse canals extending to the lateral margin of the headshield, and the second lateral transverse canal with dichotomous branchings. Discovery of C. nianzhongi from the Tataertag Formation and C. gui from the Kangshan Formation provide direct evidence on the specific level for the correlation between these two formations, which further supports the Silurian fish-bearing red beds in northwest Zhejiang belonging to the Silurian Lower Red Beds (LRBs) rather than the Upper Red Beds (URBs). Additionally, as the first record of the Changxingaspis in Tarim Basin, it extends the paleogeographical distribution of this genus from the South China Block to the Tarim Block, providing new evidence to support faunal exchanges between these two blocks and the hypothesis of a united Tarim–South China Block during the early Silurian.

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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
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