South American Triassic geochronology: Constraints and uncertainties for the tempo of Gondwanan non-marine vertebrate evolution

Irmis, Randall B.; Mundil, Roland; Mancuso, Adriana Cecilia; Carrillo-Briceño, Jorge D.; Ottone, Eduardo G.; Marsicano, Claudia Alicia

doi:10.1016/j.jsames.2022.103770

Cited by 11 publications

(7 citation statements)

References 261 publications

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“…The continental Triassic infilling of the San Rafael Basin comprises sedimentary and volcanic deposits of the Puesto Viejo Group (Stipanicic et al, 2007). A basal unconformity, attributed to the Huárpica diastrophic phase (López Gamundí et al, 1989), separates the Permian Cerro Carrizalito Formation from the Triassic Puesto Viejo Group (Ottone et al, 2014) and/or it lies unconformably on volcanic rocks of the upper Choiyoi Group (Middle Permian-Lower Triassic) (Kleiman & Salvarredi, 2001;Kleiman & Japas, 2009;Monti & Franzese, 2016;Irmis et al, 2022). It is overlain unconformably by the Paleogene Aisol Formation and/or Quaternary deposits (González Díaz, 1972).…”

Section: Geological Settingmentioning

confidence: 99%

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Evidences of Teratology and Mutagenensis in Palynological Assemblages from the Middle Triassic Puesto Viejo Group, San Rafael Depocenter, Argentina. Implications of Volcanism and Regional Environmental Stress

Zabattieri

Gutiérrez

2023

Ameghiniana

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Section: Geological Settingmentioning

confidence: 99%

“…2). Recently Irmis et al (2022) analyzed previous radiometric data of the Puesto Viejo Group and recalculated the age of the basal and top pyroclastic flow deposits of the QdlF Fm indicating ages of 243.5 ± 11.8 Ma and 235.8 ± 8.8 Ma, respectively, which have average uncertainties of ca. ±12 Ma and ca.…”

Section: Geological Settingmentioning

confidence: 99%

Evidences of Teratology and Mutagenensis in Palynological Assemblages from the Middle Triassic Puesto Viejo Group, San Rafael Depocenter, Argentina. Implications of Volcanism and Regional Environmental Stress

Zabattieri

Gutiérrez

2023

Ameghiniana

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“…Meandering fluvial systems of low to high sinuosity were developed in the floodplain, also interrupted by the emplacement of pyroclastic flows (ignimbrites). These vulcanites, which mark the limit with the overlying RSdlQ Fm, indicated an age of 235.9±2 Ma (Ottone et al , 2014), value recalculated by Irmis et al (2022) to 235.8±8.8 Ma (see Cohen et al , 2013, updated). The RSdlQ Fm begins with coarse-grained channel fill deposits originated from low sinuosity braided to meandering fluvial systems ending with basaltic lava flows (232±10 Ma: Valencio et al, 1975).…”

mentioning

confidence: 90%

“…Meandering fluvial systems of low to high sinuosity were developed in the floodplain, also interrupted by the emplacement of pyroclastic flows (ignimbrites). These vulcanites, which mark the limit with the overlying RSdlQ Fm, indicated an age of 235.9±2 Ma (Ottone et al, 2014), value recalculated by Irmis et al (2022) Figure 1. Geological map (modified after Ramos, 1993 andZavattieri et al, 2020).…”

mentioning

confidence: 99%

“…The lower section of the QdlF Fm comprises coarse-grained deposits originated from the proximal alluvial fans adjacent to the depocenter's marginal faults. These deposits were covered by pyroclastic flows (243.9±2 Ma; Monti et al, 2018, recalculated by Irmis et al, 2022 to 243.5±11.8 Ma) (see Cohen et al , 2013, updated). Finer deposits of the upper section of the QdlF Fm were deposited widely towards the center of the depocenter.…”

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confidence: 99%

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Middle Triassic Continental Palynological Assemblages of San Rafael Depocenter, Central-Western Argentina

Gutiérrez¹,

Zavattieri²

2023

Ameghiniana

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This contribution presents a comprehensive study of the unique and rich terrestrial Middle Triassic palynoflora recovered from the Quebrada de los Fósiles Formation, lower unit of the Puesto Viejo Group, San Rafael Depocenter, Mendoza Province, Argentina. The palynoflora was recorded at two sections of the unit (Quebrada de los Fósiles creek and Río Seco de la Quebrada creek), yielding diverse and well-preserved spores, pollen, freshwater algae, and fungal associations. Herein, 259 spore-pollen species are described and/or illustrated, from which eight are new:

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Cranial osteology and paleoneurology of Tarjadia ruthae: An erpetosuchid pseudosuchian from the Triassic Chañares Formation (late Ladinian‐?early Carnian) of Argentina

Desojo,

von Baczko,

Ezcurra

et al. 2024

The Anatomical Record

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Tarjadia ruthae is a quadrupedal terrestrial pseudosuchian from the Middle‐early Upper Triassic of the Chañares Formation, La Rioja Province, Argentina. Originally, this species was identified as an indeterminate archosaur and later as a doswelliid archosauriform based on very fragmentary specimens characterized by the ornamentation of the skull roof and osteoderms. Additional specimens (including skulls and postcrania) recovered in the last decade show that Tarjadia is an erpetosuchid, an enigmatic pseudosuchian group composed ofby six species registered in Middle‐Upper Triassic continental units of Tanzania, Germany, Scotland, North America, Brazil, and Argentina. Tarjadia ruthae from Argentina and Parringtonia gracilis from Tanzania are the best preserved and more abundant species. Although the monophyly of Erpetosuchidae is well supported, alternative high‐level positions within Archosauria have been suggested, such as sister taxon to Crocodylomorpha, Aetosauria, or Ornithosuchidae. In order to improve the knowledge about the erpetosuchids, we performed a detailed description and paleoneurological reconstruction of the skull of Tarjadia ruthae, based on two articulated partial skulls (CRILAR‐Pv 478 and CRILAR‐Pv 495) and other fragmentary specimens. We analyzed the stratigraphic and geographic occurrence of historical and new specimens of Tarjadia and provided a new emended diagnosis (the same for the genus as for the species, due to monotypy) along with a comparative description of the cranial endocast. The skull of Tarjadia is robust, with a thick and strongly ornamented skull roof, triangular in dorsal view, with concave lateral margins at mid‐length that form an abrupt widened posterior region. The external nares are the smallest openings of the skull. The antorbital fossa is deeply excavated and has a small heart‐shaped fenestra with both lobes pointing anteriorly. The supratemporal fenestrae are as large and rounded as the orbits, and the infratemporal fenestrae are L‐shaped with an extensive excavation along the jugal, quadratojugal and quadrate. The hemimandibles are low, slightly concave on the dentigerous region and strongly convex on the posterior region, conferring them a S‐shaped profile in dorsal view. The external mandibular fenestra is small and elliptic, being twice longer than high. The maxillary dentition is restricted to the anterior to mid region of the rostrum. Since the braincase of both specimens is partially damaged, the dorsal surface of the brain could not be entirely reconstructed. As a result, the endocast is anteroposteriorly elongated and seemingly flat, and the cephalic flexure seems to be lower than expected for a suchian. The labyrinth is twice wider than high, the semicircular canals are remarkably straight, and the anterior canal is longer than the posterior one.

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South American Triassic geochronology: Constraints and uncertainties for the tempo of Gondwanan non-marine vertebrate evolution

Cited by 11 publications

References 261 publications

Evidences of Teratology and Mutagenensis in Palynological Assemblages from the Middle Triassic Puesto Viejo Group, San Rafael Depocenter, Argentina. Implications of Volcanism and Regional Environmental Stress

Evidences of Teratology and Mutagenensis in Palynological Assemblages from the Middle Triassic Puesto Viejo Group, San Rafael Depocenter, Argentina. Implications of Volcanism and Regional Environmental Stress

Middle Triassic Continental Palynological Assemblages of San Rafael Depocenter, Central-Western Argentina

Cranial osteology and paleoneurology of Tarjadia ruthae: An erpetosuchid pseudosuchian from the Triassic Chañares Formation (late Ladinian‐?early Carnian) of Argentina

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