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3. Darriwilian (Middle Ordovician) graptolites from Sierra de Lina and Cauchari, Argentine Puna.

Author

Rueda, E. Kristal, Ortega, Gladys, Albanesi, Guillermo L., Monaldi, C. Rubén, and Lopez, Fernando E.

Subjects
*GRAPTOLITES, *TURBIDITES, *PROVINCES
Abstract

This contribution reports two graptolite assemblages from the Puna Turbidite Complex, outcropping in Sierra de Lina and Cauchari locality, western Puna, Jujuy and Salta provinces, Argentina. In Sierra de Lina, the graptolite assemblage comprises Didymograptus sp., Glossograptus fimbriatus, Cryptograptus schaeferi, Archiclimacograptus sp., Pseudamplexograptus distichus, Pseudamplexograptus latus, ?Urbanekograptus retioloides and Hustedograptus sp. The graptolite fauna collected from Cauchari locality includes Didymograptus spp., Archiclimacograptus caelatus, Archiclimacograptus sp. cf. A. micidus, scarce and incomplete specimens doubtfully referred to the genera Archiclimacograptus and Acrograptus and scarce siculae of Cryptograptus sp. The associations allow us to identify the Pseudamplexograptus distichus Zone in Sierra de Lina and possibly the Pterograptus elegans Zone at Cauchari locality. Graptolite assemblages recorded in both zones allow assigning a middle‐late Darriwilian (Middle Ordovician) age for the bearer levels. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Fryxellodontus inornatus(Conodonta) and associated conodonts from the Furongian (upper Cambrian) of the Cordillera Oriental, Argentina

Author

Rueda, E. Kristal and Albanesi, Guillermo L.

Abstract

The conodont biostratigraphy of the middle-upper Lampazar Formation exposed at El Angosto del Moreno area, Cordillera Oriental of Jujuy, Argentina is analyzed. This 150 m thick unit overlies the Padrioc Formation (late Cambrian) and underlies the Cardonal Formation (late Cambrian–early Tremadocian). The unit is composed of pelites interbedded with sandstones and calcarenites and occasional coquinas, which were deposited primarily in offshore environments. Two calcarenite samples (3200 g) yielded 599 conodont elements, corresponding to 35 species of the genera Coelocerodontus, Cordylodus, Eoconodontus, Eodentatus, Fryxellodontus, Furnishina, Granatodontus, Hirsutodontus, Phakelodus, Proconodontus, Prooneotodus, Prosagittodontus, Teridontus, and Anellodontusn. gen. The recovered specimens are well preserved, exhibiting a Color Alteration Index (CAI) value of 1.5–2, which represents overburden palaeotemperatures between 50°C and 140°C. The conodont association corresponds to the upper part of the Cordylodus proavusZone, indicating a late Furongian age for the sample levels. This contribution reports the first conodont record of Fryxellodontus inornatusand F. lineatusspecies, the genus Eodentatus, and a new genus Anellodontusn. gen. in South America.

Published
2024
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