Matías J. Mango

Research Center on Earth Sciences

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Guillermo L. Albanesi

Universidad Nacional de Córdoba

Gustavo G. Voldman

Research Center on Earth Sciences

Gladys Ortega

Universidad Nacional de Córdoba

Miles A. Henderson

The University of Texas of the Permian Basin

Galina P. Nestell

The University of Texas at Arlington

Farzad Poursalehi

University of Isfahan

Fernanda Serra

Universidad Nacional de Córdoba

Nicolás A. Feltes

Research Center on Earth Sciences

Ali Bahrami

University of Isfahan

Marcelo G. Carrera

Universidad Nacional de Córdoba

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

Universidad Nacional de Córdoba

Research Center on Earth Sciences

Centro Científico Tecnológico - Córdoba

University of Isfahan

Centro Científico Tecnológico - Tucumán

Graduate University of Advanced Technology

National University of San Juan

Centro Científico Tecnológico - San Juan

The University of Texas of the Permian Basin

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Bioestratigrafía y provincialismo de conodontes del tramo medio-superior de la Formación San Juan en el cerro Viejo de Huaco, Precordillera, Argentina

Andean geology (2018)

Matías J. Mango Guillermo L. Albanesi

The present study deals with the conodont biostratigraphy from the middle and upper parts of the San Juan Formation (Lower-Middle Ordovician) exposed at the Los Gatos creek section, west of the cerro Viejo de Huaco, Central Precordillera of San Juan Province. The numerous conodonts recovered, corresponding to 55 species, allow to recognize a series of biozones in the studied section. The biostratigraphic analysis carried out herein allows determining associations of conodonts assignable to the Oepikodus evae, Oepikodus intermedius, Baltoniodus triangularis-Tripodus laevis and Lenodus variabilis zones that correspond to the middle Floian to lower Darriwilian. The Baltoniodus navis and Microzarkodina parva zones were not identified due to insufficient information provided by this stratigraphic section. In general, the levels corresponding to the Baltoniodus triangularis-Tripodus laevis Zone contain more conodonts, than the records of other localities from Precordillera. These specimens are well preserved with a color alteration index (CAI) of 2-2.5, indicating overburden paleotemperatures ranging from 60° and 155° C. The large presence of fragmented conodonts, with recrystallized surfaces and crystal overgrowth, could indicate the effect of distinctive diagenetic fossil processes on the bearer limestone. The analysis of the diversity and abundance of genera and species of conodonts by chronostratigraphic intervals presents a great percentage of cosmopolitan taxa, 18% and 38% in common, at species level, only with the North-American Midcontinent Province (NAMP), and with a small percentage with the North-Atlantic Province (NAP) and the Precordillera, which allows to approximate a greater paleobiogeographic affinity of the conodonts recovered with those of the NAMP than those of the NAP for the entire interval studied. On the other hand, the Precordillera is verified as a province with its own characteristics as identified by several authors.

Biozone

Conodont

10.5027/andgeov45n2-3056

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Citations (20)

Conodont biostratigraphy from the upper San Juan Formation (Middle Ordovician) at Niquivil, Argentine Precordillera

Journal of South American Earth Sciences (2018)

Matías J. Mango Guillermo L. Albanesi

Conodont

Carbonate platform

10.1016/j.jsames.2018.03.008

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Citations (5)

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 and graptolite biostratigraphy of the lower–middle Darriwilian (Middle Ordovician), Cerro Viejo of Huaco, Argentine Precordillera

Geological Journal (2018)

Matías J. Mango Gladys Ortega Guillermo L. Albanesi

Abstract The distribution of conodonts and graptolites from the upper 13 m of the San Juan Formation and the first metre of the lower member of the Los Azules Formation, Los Gatos and Amarilla creeks, Cerro Viejo of Huaco, Central Precordillera from San Juan, Argentina, is studied. The conodonts from the top stratum of the San Juan Formation at the Los Gatos creek section correspond to the Lenodus variabilis Zone, whereas at the Amarilla creek section, they represent the Yangtzeplacognathus crassus Zone, verifying the diachronous top surface of the San Juan Formation. In the lower member of the Los Azules Formation, 81 conodont elements are recorded from bedding plane surfaces, where the presence of Paroistodus horridus horridus (Barnes & Poplawski) allows to recognize the Y. crassus Zone. On the basis of the graptolite and conodont association, we estimate that the top of the San Juan Formation at Los Gatos creek corresponds to the Levisograptus dentatus Zone, L. dentatus Subzone, whereas at the Amarilla creek, the Arienigraptus angulatus Subzone of the same zone is represented. The presence of the graptolite A. angulatus (Mu) in the lower member of the Los Azules Formation in both sections indicates the L. dentatus Zone ( A. angulatus Subzone). The records of graptolites in limestones of the San Juan Formation and of abundant conodonts on bedding plane surfaces of the lower member of the Los Azules Formation are important, taking into account the type of facies where they occur. The conodont records in the referred type of preservation are scarce in the Ordovician, which allows for a more precise biostratigraphic correlation between conodont and graptolite biostratigraphy.

Conodont

Biozone

Stratum

Diachronous

10.1002/gj.3333

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Citations (12)

First Dapingian linguliform microbrachiopods from the Argentine Precordillera (Cuyania terrane): Taxonomy and faunal relationships

Palaeoworld (2024)

Fernando J. Lavié Matías J. Mango

10.1016/j.palwor.2024.03.002

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Citations (0)

The Baltoniodus navis Zone in the Gualcamayo Formation (Middle Ordovician), Central Precordillera, Argentina

Journal of South American Earth Sciences (2023)

Matías J. Mango Guillermo L. Albanesi

Conodont

10.1016/j.jsames.2023.104332

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Citations (3)

Early Ordovician conodonts from the Ullum Volcanic Center, Argentine Precordillera: Biostratigraphy, geothermometry and preservation

Journal of South American Earth Sciences (2021)

Matías J. Mango Gustavo G. Voldman Guillermo L. Albanesi

Conodont

Radiometric dating

10.1016/j.jsames.2021.103504

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Citations (3)

Systems tracts of the San Juan Formation (Ordovician), Argentine Precordillera: Conodont record analyses, thin sections and its intercontinental importance

Journal of South American Earth Sciences (2021)

Matías J. Mango Guillermo L. Albanesi

Conodont

Transgressive

Marine transgression

Lithology

Sequence (biology)

10.1016/j.jsames.2021.103617

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Citations (7)

Ordovician (Floian-lower Darriwilian) conodont biofacies of the San Juan Formation in the Cerro Viejo of Huaco, Argentine Precordillera

Marine Micropaleontology (2019)

Matías J. Mango Guillermo L. Albanesi

Conodont

Lithology

Transgressive

Trilobite

10.1016/j.marmicro.2019.101784

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Citations (10)

Ordovician enigmatic sclerite-type elements from western Argentina: oldest axial components of alcyonacean octocorals?

Acta Palaeontologica Polonica (2021)

Marcelo G. Carrera Gustavo G. Voldman Matías J. Mango Galina P. Nestell

The unusual findings of Lower and Middle Ordovician tiny sclerite-type elements in the San Juan Formation of the Argentine Precordillera are described and analysed.The well-preserved silicified and phosphatized association consists of spindle-shaped morphotypes, ornamented with small regular granules or tubercles with some elements connected by their tips in a linear manner.Some morphologic characteristics of these mostly fused or connected sclerite-type elements are present in the alcyonacean octocorals.Their affinities with sponge spicules are also discussed.The oldest records of alcyonacean sclerites have been dated as late Llandovery to late Wenlock (Silurian).The discovery of possible octocoral skeletal elements in the Lower Ordovician of western Argentina may represent the oldest occurrence of such fundamental skeletal elements in the evolutionary history of the octocorals.Although a proper group assignment is still speculative at this state of knowledge, there is an implication that these early forms could be axial skeletal elements comparable to those seen in the Scleraxonia or Calcaxonia octocorals.One new genus Catenatus and new species Catenatus argentinus are described.

10.4202/app.00869.2020

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Citations (2)