Lower Ordovician Trilobites from SE Sardinia (Italy): A new record of the “Taihungshania bioprovince”

IF 1.6 4区 地球科学 Q2 PALEONTOLOGY
Gian Luigi Pillola , Muriel Vidal
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引用次数: 2

Abstract

A systematic description of the so far unique trilobite fauna and the associated biota from the Arenarie di San Vito Formation, in the outcrops close to the abandoned Tacconis mine (allochthonous nappe zone, Sarrabus, SE Sardinia, Italy), proves the occurrence of Taihungshania shui landayranensis, Ampyx priscus, Asaphellus sp., Merlinia sp., Niobe fourneti?, Geragnostus sp. and Symphysurus sp., accompanied by several taxa of graptolites, ichnofossils and less common bivalves, gastropods, cephalopods and hyolithids. The taphonomical signature, sedimentary structures and “Raphiophorid biofacies” clearly argue for an early Floian age and a median platform (i.e., offshore to shoreface) depositional environment. The occurrence of T. shui landayranensis in Sardinia allows us to determine the age of the Arenarie di San Vito Formation (just below the Sarrabese unconformity) and to discuss the palaeobiogeographical affinities highlighting the value of the “Taihungshania bioprovince”. The Tacconis trilobite fauna displays close affinities with Montagne Noire in France, Taurides in Turkey, Alborz in Iran, and south China, placing the SE Sardinia allochthonous area in a global Ordovician palaeogeographic sketch. A brief discussion on relationships and palaeobiogeographical affinities between the Sardinian nappe zone and the autochthonous “foreland” Sulcis-Iglesiente, which are adjacent today, strongly suggests a separation during the Ordovician, although both areas pertain to the Gondwana margin.

意大利撒丁岛东南部下奥陶统三叶虫:“太行山生物省”的新记录
对废弃的 Tacconis 矿(意大利撒丁岛东南部 Sarrabus 的异生岩层带)附近出露的 Arenarie di San Vito 地层中迄今为止独一无二的三叶虫动物群及相关生物群进行了系统描述,证明了 Taihungshania shui landayranensis、Ampyx priscus、Asaphellus sp.、Merlinia sp.、Niobe fourneti?、Geragnostus sp.和 Symphysurus sp.的存在、此外,还发现了一些爬行动物类群、化石和不太常见的双壳类动物、腹足类动物、头足类动物和土石类动物。岩相特征、沉积结构和 "Raphiophorid 生物面貌 "都清楚地表明,其年代为早期浮罗纪,沉积环境为中层平台(即从近海到海岸面)。T. shui landayranensis 在撒丁岛的出现使我们能够确定 Arenarie di San Vito 地层(就在 Sarrabese unconformity 的下方)的年龄,并讨论古生物地理的亲缘关系,突出了 "Taihungshania 生物省 "的价值。Tacconis三叶虫动物群与法国的Montagne Noire、土耳其的Taurides、伊朗的Alborz和中国南部有着密切的亲缘关系,将撒丁岛东南部同源地区置于全球奥陶纪古地理草图中。对撒丁岛岩层带与今天相邻的自生 "前陆 "苏尔西斯-伊格莱森特之间的关系和古生物地理亲缘关系的简要讨论,强烈表明尽管这两个地区都属于冈瓦纳边缘,但它们在奥陶纪期间已经分离。
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来源期刊
Geobios
Geobios 地学-古生物学
CiteScore
3.30
自引率
6.20%
发文量
28
审稿时长
6-12 weeks
期刊介绍: Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.
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