Paleontology and stratigraphic implications of a late Paleocene elasmobranch assemblage in Talcahuano, southcentral Chile

IF 0.9 4区地球科学 Q3 GEOLOGY

Andean Geology Pub Date : 2023-06-07 DOI:10.5027/andgeov50n2-3494

D. Rodríguez, David John Ward, Jorge Quezada

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引用次数: 0

Abstract

Late Paleocene elasmobranch findings are reported, along with reinterpretations of some previous taxonomic identifications in two main outcrops around Talcahuano area (Biobío region, Chile), and also delimiting the exposed lithostratigraphic units. Reviewed fossils are among 15 genera, comprising the species Paraorthacodus clarkii, Squalus minor, Squalus orpiensis, Centrophorus sp., Squatina prima, Anomotodon novus, Striatolamia striata, Carcharias spp., Sylvestrilamia teretidens, Odontaspis winkleri, Palaeohypotodus speyeri, Palaeohypotodus rutoti, Isurolamna inflata, Premontreia gilberti, Physogaleus secundus, Palaeogaleus vincenti and Hypolophodon sylvestris. The main elasmobranch assemblage, collected from the San Martín outcrop, indicates deposition in a shallow lower shoreface-uppermost offshore marine environment and warm-temperate water. Moreover, this elasmobranch assemblage constrains the age of Pilpilco Formation into the middle-late Thanetian, which implies a latest Thanetian-early Ypresian age for the overlying Curanilahue Formation and a Danian-early Thanetian hiatus with the underlying Quiriquina Formation.

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智利中南部Talcahuano古新世晚期火山分支组合的古生物学和地层意义

报告了古新世晚期elasmobranch的发现，以及对Talcahuano地区（智利Biobío地区）周围两个主要露头的一些先前分类鉴定的重新解释，并划定了暴露的岩石地层单元。已审查的化石包括15个属，包括克氏拟orthacodus clarkii、小角鲨、大角鲨、中央珊瑚属、初级角鲨、新无齿鲨、条纹纹腹蛛、Carcharias属、Sylvestrilamia teretidens、Odontapis winkleri、斯佩耶里古海象、鲁托蒂古海象，Paleogaleus vincenti和Hyplopodon sylvestris。从San Martín露头采集的主要火山分支组合表明沉积在浅层下滨面最上层的近海海洋环境和暖温带水中。此外，这种滑支组合将Pilpilco组的年龄限制在中-晚塔奈阶，这意味着上覆Curanilahue组的塔奈阶-早伊普雷西阶年龄最晚，而下伏Quiriquina组的大丹阶-早塔奈阶间断。

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来源期刊

Andean Geology 地学-地质学

CiteScore

3.90

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.