Nicolás A. Feltes

Research Center on Earth Sciences

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Guillermo L. Albanesi

Universidad Nacional de Córdoba

Fernanda Serra

Universidad Nacional de Córdoba

Miles A. Henderson

The University of Texas of the Permian Basin

Stig M. Bergström

The Ohio State University

Gladys Ortega

Universidad Nacional de Córdoba

Gustavo G. Voldman

Research Center on Earth Sciences

Linda C. Kah

Knoxville College

Benjamin Schmitz

Deutsche Bahn (Germany)

Yemane Asmerom

University of New Mexico

Victor J. Polyak

University of New Mexico

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Universidad Nacional de Córdoba

Consejo Nacional de Investigaciones Científicas y Técnicas

Research Center on Earth Sciences

Centro Científico Tecnológico - Córdoba

Planetary Science Institute

University of Tennessee at Knoxville

Lund University

University of New Mexico

Woods Hole Oceanographic Institution

International Union of Railways

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Darriwilian (Middle Ordovician) conodonts and graptolites from the Cerro La Chilca Section, Central Precordillera, Argentina

Andean geology (2020)

Fernanda Serra Nicolás A. Feltes Matías J. Mango Miles A. Henderson Guillermo L. Albanesi

The Ordovician System is extensively represented in the Precordillera of San Juan Province, Argentina. At the Cerro La Chilca in the Jáchal area, the limestone of the San Juan Formation is paraconformably overlain by interbedded limestone and shale of the Gualcamayo Formation. The present contribution reports new data on the conodont fauna and biostratigraphy of these darriwilian units, revising local and regional chronostratigraphic relationships. New information on the composition of conodont and graptolite associations through the stratigraphic sequence is presented. The presence of Paroistodus horridus horridus, Yangtzeplacognathus crassus, and Histiodella sinuosa constrain the uppermost strata of the San Juan Formation to the lower part of the Y. crassus Zone, according to the Baltoscandian scheme, and to the H. sinuosa Subzone of the Periodon macrodentatus Zone of the North American scheme. In the overlying Gualcamayo Formation the co-occurrence of Y. crassus with Histiodella holodentata enable the recognition of the Y. crassus Zone and the H. holodentata Subzone of the P. macrodentatus Zone. The identification of these zones allows for precise global and regional correlation. A graptolite assemblage that belongs to the epipelagic and deep-water biotopes with some components restricted to low paleolatitudes is recognized. This diverse assemblage is characteristic of the pelagic biofacies. The important diversity of graptolites in this section suggests a favorable environment for their development. Local changes in the taxonomic composition are recognized through the Gualcamayo Formation. When comparing this fauna with that of different study localities from the Central Precordillera (Cerro Potrerillo, Oculta Creek, Cerro Viejo de Huaco and Las Aguaditas Creek) slight differences in the generic composition are observed. Taxonomic differences support the preference of certain associations for particular environments; though, graptolites are more diverse in black shales facies, which represent deeper environments (the Los Azules Formation), in relation to the calcareous-shale facies of the Gualcamayo Formation from Cerro La Chilca and correlative unit at Las Aguaditas Creek.

Conodont

Biozone

Sequence (biology)

10.5027/andgeov47n1-3229

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Citations (15)

Conodont biostratigraphy and global correlation of the middle Darriwilian-lower Sandbian (Ordovician) Las Aguaditas Formation, Precordillera of San Juan, Argentina

Andean geology (2016)

Nicolás A. Feltes Guillermo L. Albanesi Stig M. Bergström

Middle Darriwilian to lower Sandbian conodonts were recorded from the Las Aguaditas Formation at its type section in the Argentine Precordillera. A total of 9,974 conodont specimens were recovered from 46 carbonate samples, which represent 68 species of 38 genera. A biostratigraphic study verified a middle Darriwilian age for the interval spanning the contact between the San Juan and the Las Aguaditas formations. The following zones are determined in the study section: the Lenodus variabilis Zone, with the Periodon gladysae and Paroistodus horridus subzones following the Precordilleran scheme; the L. variabilis, Yangtzeplacognathus crassus, and the Eoplacognathus pseudoplanus zones with the Microzarkodina hagetiana and M. ozarkodella subzones, and the Pygodus anserinus Zone, according to the Scandinavian scheme; the Periodon macrodentatus Zone, with the Histiodella sinuosa, H. holodentata and H. cf. holodentata subzones, and the P. zgierzensis Zone with the H. kristinae Subzone that correlates the North American scheme. A stratigraphic gap was recognized between the lower and middle members of the Las Aguaditas Formation. It comprises the Eoplacognathus suecicus and Pygodus serra zones, and the lower subzone of the Pygodus anserinus Zone. The variation of conodont diversity through the study section conforms to shallowing and deepening patterns, which accompanies the changes of the provenance lithology. Three conodont assemblages were quantitatively recognized: a) Diverse conodont association, b) Low diversity conodont association and c) Recovery phase association. We propose to use the North American biozonal scheme of conodonts for the Central Precordillera because of the affinity of documented index taxa, which provides a more accurate intercontinental correlation for the global Middle Ordovician Series.

Conodont

Lithology

Biozone

Section (typography)

10.5027/andgeov43n1-a04

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Citations (42)

LINGULIFORM MICROBRACHIOPODS FROM LAS AGUADITAS AND LAS CHACRITAS FORMATIONS (MIDDLE-UPPER ORDOVICIAN) OF ARGENTINE PRECORDILLERA

DOAJ (DOAJ: Directory of Open Access Journals) (2019)

Fernando J. Lavié Fernanda Serra Nicolás A. Feltes

Middle-Upper Ordovician linguliform microbrachiopods are described and illustrated for the first time from the Las Aguaditas Formation at the Los Blanquitos and Mogotes Azules ranges and from the Las Chacritas Formation at the Las Chacritas River section, Central Argentine Precordillera. This systematic study includes nine families, namely Obolidae, Paterulidae, Discinidae, Acrotretidae, Scaphelasmatidae, Torynelasmatidae, Ephippelasmatidae, Biernatidae and Eoconulidae. This diverse fauna is conformed of specimens corresponding to Lingulops sp., Paterula incognita Mergl, Schizotreta sp., Scaphelasma zharykensis Popov, Torynelasma? sp., Akmolina sp., Ephippelasma sp., Numericoma simplex Holmer, and Eoconulus sp. However, specimens from the order Acrotretida proved to be an important component of this fauna, enabling the recognition of two new species which are thoroughly described, Conotreta andina n. sp. and Biernatia rhapsody n. sp.

Section (typography)

10.13130/2039-4942/12169

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Citations (2)

Middle Darriwilian to Lower Sandbian Conodont Zones and Global Correlation of the Argentine Precordillera

Guillermo L. Albanesi Nicolás A. Feltes Fernanda Serra

Conodont

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Darriwilian (Middle Ordovician) conodont biofacies from the Central Precordillera of Argentina

Marine Micropaleontology (2016)

Fernanda Serra Nicolás A. Feltes Miles A. Henderson Guillermo L. Albanesi

Conodont

Paleoecology

10.1016/j.marmicro.2016.12.002

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Citations (22)

The Middle Darriwilian (Middle Ordovician) δ^ {13}C isotopic event (MDICE) recognized in the Argentine Precordillera

EGUGA (2012)

Guillermo L. Albanesi Stig M. Bergström Benjamin Schmitz Fernanda Serra Nicolás A. Feltes

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Middle Darriwilian conodont zones in the uppermost San Juan limestone and the lower member of the Las Aguaditas formation, central Precordillera of San Juan, Argentina

Nicolás A. Feltes Guillermo L. Albanesi Stig M. Bergström

Fil: Feltes, Nicolas Alexis. Universidad Nacional de Cordoba. Facultad de Ciencias Exactas, Fisicas y Naturales. Museo de Paleontologia; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas; Argentina

Conodont

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High-resolution conodont biostratigraphy from the Darriwilian Stage (Middle Ordovician) of the Argentine Precordillera and biodiversity analyses: a CONOP9 approach

Lethaia (2018)

Fernanda Serra Nicolás A. Feltes Guillermo L. Albanesi Daniel Goldman

Ordovician conodonts have been extensively documented in the Argentine Precordillera, providing a robust database for a diverse set of palaeontological studies. Despite the numerous studies, the published taxonomy and stratigraphical ranges, data remain contradictory for particular time intervals. Data from a new conodont collection from the Gualcamayo Formation exposed at the Cerro La Chilca section, and new information on the occurrence and ranges of species from the Las Chacritas and Las Aguaditas sections are presented herein. We used a computer-assisted numerical sequencing program (CONOP9) to construct a composite stratigraphical range chart from data of 57 conodont species in four sections from the Argentine Precordillera. The identified zones of Lenodus variabilis, Yangtzeplacognathus crassus, Eoplacognathus pseudoplanus and Eoplacognathus suecicus allowed us to verify and adjust the biostratigraphical scheme for the Darriwilian of the Central Precordillera. Additionally, species of the genera Histiodella, namely Histiodella sinuosa, Histiodella holodentata, Histiodella kristinae and Histiodella bellburnenisis, enable a reasonable correlation between the Histiodella-based zonation and the Baltoscandian zonation. Conodont diversity is evaluated using conventional measures (total diversity and normalized diversity) and an interval-free approach with CONOP9 software. Our data show a positive pattern in conodont diversification, increasing rapidly through the L. variabilis to the Y. crassus zones and reaching a peak in the E. pseudoplanus Zone. When analysing diversity fluctuations with respect to the environmental changes within the depositional basin, migrations in and out of the basin related to local sea level fluctuations appear to be an important process driving the conodont diversity pattern in the Precordillera.

Conodont

10.1111/let.12306

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Citations (12)

⁸⁷SR/⁸⁶SR AND ε_ND STRATIGRAPHY OF MIDDLE ORDOVICIAN CARBONATE SEDIMENTS IN ARGENTINA: A POTENTIAL LINK BETWEEN BIOGEOCHEMICAL AND PHYSIOCHEMICAL CHANGES IN OCEAN CHEMISTRY

Abstracts with programs - Geological Society of America (2017)

Miles A. Henderson Linda C. Kah Guillermo L. Albanesi Nicolás A. Feltes Fernanda Serra

Biogeochemical Cycle

10.1130/abs/2017am-297832

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Citations (0)

Darriwilian (Middle Ordovician) δ13Ccarb chemostratigraphy in the Precordillera of Argentina: Documentation of the middle Darriwilian Isotope Carbon Excursion (MDICE) and its use for intercontinental correlation