First documentation of Late Paleozoic conodonts from Argentina: Biostratigraphic and paleoclimatic constraints for the Late Paleozoic Ice Age in SW Gondwana

IF 4.8 1区 地球科学 Q1 GEOLOGY
Geology Pub Date : 2024-08-01 DOI:10.1130/g52133.1
Gustavo G. Voldman, Gabriela A. Cisterna, Andrea F. Sterren, Miguel Ezpeleta, James E. Barrick
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Abstract

We present the first discovery of Late Paleozoic conodonts in Argentina, marking the southernmost occurrence of this fossil group in the dominantly cold, high latitudes of Gondwana. Recovered from the siliciclastic Río del Peñón (RDP) Formation at the Rincón Blanco section in the northern Precordillera, La Rioja Province, the fossil assemblage includes Neognathodus colombiensis and Neognathodus “pre-colombiensis,” precisely indicating the early Moscovian (late Atokan in North America) N. colombiensis Zone. Furthermore, the conodont fauna establishes a crucial temporal constraint for the brachiopod Tivertonia jachalensis–Streptorhynchus inaequiornatus (TS) Zone, which is a widely employed biostratigraphic unit in southern South America. The warm-water affinity of Neognathodus is in accordance with the record of typical paleoequatorial faunal elements in the TS Zone in several central western Argentinian basins, thus reinforcing the idea of a climatic amelioration in the southern latitudes of Gondwana during the early Moscovian.
阿根廷晚古生代锥齿动物的首次文献记载:冈瓦纳西南部晚古生代冰期的生物地层学和古气候制约因素
我们介绍了在阿根廷首次发现的晚古生代锥齿类化石,标志着这一化石群出现在冈瓦纳寒冷高纬度地区的最南端。该化石群从拉里奥哈省北部 Precordillera 的 Rincón Blanco 段硅质碎屑岩 Río del Peñón(RDP)地层中发现,包括 Neognathodus colombiensis 和 Neognathodus "pre-colombiensis",准确地表明了早 Moscovian(北美阿托坎晚期)N. colombiensis 区。此外,锥齿动物群还为腕足动物 Tivertonia jachalensis-Streptorhynchus inaequiornatus(TS)区建立了重要的时间约束,该区是南美洲南部广泛使用的生物地层单元。Neognathodus的暖水亲缘关系与阿根廷中西部几个盆地中TS区典型的古赤道动物元素记录相吻合,从而加强了冈瓦纳南部纬度地区在早 Moscovian时期气候改善的观点。
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来源期刊
Geology
Geology 地学-地质学
CiteScore
10.00
自引率
3.40%
发文量
228
审稿时长
6.2 months
期刊介绍: Published since 1973, Geology features rapid publication of about 23 refereed short (four-page) papers each month. Articles cover all earth-science disciplines and include new investigations and provocative topics. Professional geologists and university-level students in the earth sciences use this widely read journal to keep up with scientific research trends. The online forum section facilitates author-reader dialog. Includes color and occasional large-format illustrations on oversized loose inserts.
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