阿根廷南巴塔哥尼亚早侏罗世Euthyneura(异鳃目:腹足目)首次报道

IF 0.9 4区地球科学 Q3 GEOLOGY

Andean Geology Pub Date : 2023-06-07 DOI:10.5027/andgeov50n2-3487

Mariel Ferrari

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引用次数: 0

摘要

本文描述了阿根廷南部巴塔哥尼亚Chubut盆地早侏罗世(早Pliensbachian)海相沉积物中的两个新种Euthyneura (Heterobranchia: Gastropoda)。新种Cossmannina australis 11 . sp.和cydrobullina caquelensis 11 . sp.分别在塞拉德·特卡山脉西坡和río特卡山谷的Cerro Caquel地区发现。新定地发现了菊石Eoamaltheus sp. (E. meridianus Hillebrandt带，Ibex带至daveei带上部)，为研究区海相沉积确定了早Pliensbachian时代，也为Sierra de Tecka地区早侏罗世最古老的记录提供了新的证据。Chubut盆地的Euthyneura的新报告将这一分支的古地理分布扩展到最早的Pliensbachian时期的南半球。

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First report of Euthyneura (Heterobranchia: Gastropoda) in the Early Jurassic of Southern Patagonia, Argentina

The present paper aims at the description of two new species of Euthyneura (Heterobranchia: Gastropoda) in the Early Jurassic (early Pliensbachian) marine deposits of the Chubut Basin at southern Patagonia, Argentina. The new species Cossmannina australis nov. sp. and Cylindrobullina caquelensis nov. sp. were found at the Cerro Caquel locality located in the western slope of Sierra de Tecka and río Tecka valley. The new locality yielded the ammonite Eoamaltheus sp. (E. meridianus Hillebrandt Zone, upper part of Ibex Zone to Davoei Zone) which allowed to assign an early Pliensbachian age for the marine deposits at the studied area, providing also new evidence of the oldest record within the Early Jurassic in the Sierra de Tecka region. The new report of Euthyneura in the Chubut Basin extends the palaeobiogeographical distribution of this clade into the southern hemisphere during the earliest Pliensbachian.

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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.