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Veronica Vennari

Veronica Vennari
CONICET (CCT Mendoza) · IDEVEA Instituto de Evolución Ecología Histórica y Ambiente- (UTN-CONICET)

PhD in Geological Sciences

About

44
Publications
15,962
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Citations
Introduction
Currently I am focus on the study of the ammonoid fauna of the Vaca Muerta Formation of the Neuquén Basin, of Late Tithonian to Berriasian age. My main interests are related to the systematics, palaeoecology, palaeobiogeography and biostratigraphy of that group of cephalopods around the transition between the Jurassic and Cretaceous systems.
Additional affiliations
August 2015 - present
IANIGLA - CONICET
Position
  • Assistant researcher
January 2011 - August 2015
Universidad de Buenos Aires
Position
  • PostDoc Position
Education
March 2003 - March 2013
Universidad de Buenos Aires
Field of study
  • Paleontology

Publications

Publications (44)
Conference Paper
Full-text available
La hipótesis de un continente mesozoico ocupando el lugar del actual océano Pacífico fue propuesta entre mediados del siglo XIX y principios del siglo XX por diversos autores, para explicar afinidades en la flora y fauna de continentes hoy en día separados por grandes distancias: América, Oceanía y la Antártida. En este marco, el geólogo alemán Car...
Chapter
This chapter summarizes the abundant marine paleobiological markers recorded in the Vaca Muerta Formation illustrating their richness, biodiversity, and application for age dating and paleobiogeographical global correlation. The markers described include ammonites, calcareous nannofossils, calcisphaeres (calcareous dinoflagellate cysts), calpionell...
Article
Fecha de recepción del manuscrito: 24/02/2020 Fecha de aceptación del manuscrito: 29/02/2020 Fecha de publicación: 15/04/2020 Resumen-En el marco de las expediciones organizadas por el Museo de la Plata se destacan las observaciones de los Andes mendocinos de Carl Burckhardt, Leo Wehrli y Rudolf Hauthal. Sobre la base de sus precisas descripciones...
Article
Metriorhynchidae is an extinct group of Jurassic–Cretaceous crocodylomorphs that developed a fully pelagic lifestyle. Its Jurassic record is outstanding (it includes around 40 nominal species), while the records that can be restricted to the Cretaceous are particularly sparse. Here we describe a partial skull of a new species of Cricosaurus, Cricos...
Article
Full-text available
Fecha de recepción del manuscrito: 24/02/2020 Fecha de aceptación del manuscrito: 29/02/2020 Fecha de publicación: 15/04/2020 Resumen-En el marco de las expediciones organizadas por el Museo de la Plata se destacan las observaciones de los Andes mendocinos de Carl Burckhardt, Leo Wehrli y Rudolf Hauthal. Sobre la base de sus precisas descripciones...
Article
In the western sector of the Neuquén Basin, the organic-rich shales of the Vaca Muerta Formation are intercalated with turbidite sandstone intervals and slump structures integrated in the Huncal Member. The age of the Huncal sandstones based on the integration of the ammonite faunas, calcareous nannofossils and U-Pb analysis is late Berriasian in t...
Conference Paper
Full-text available
Since 2009 the Berriasian Working Group (ISCS, ICS) has been searching for the best sequence globally to represent the Tithonian/Berriasian (Jurassic/Cretaceous) boundary. To take this forward, it has made field assessments of more than sixty localities, documenting their sequences, fossil biotas and magnetostratigraphy. Only on such a sound factua...
Article
The main objective of this study is to provide a review of the Tithonian succession of the Neuquén Basin and related Andean areas with an update from recent results on biostratigraphy and radio-isotopic geochronology. The studied successions include continental clastics and volcaniclastics of the Tordillo Formation and economically-important hydroc...
Conference Paper
Full-text available
Los geólogos suizos Carl Burckhardt y Leo Wehrli se incorporan a fines del siglo XIX a la Sección de Exploraciones Nacionales del Museo de La Plata. Prontamente, en el verano de 1897 realizan una larga campaña a los Andes de Mendoza y la región chilena aledaña. Parten de Buenos Aires el12 de enero de 1897 y recién llegan a San Rafael el 19 de enero...
Article
Full-text available
Lytohoplites Spath, 1925 is a late Tithonian–?early Berriasian ammonoid genus with a southern perigondwanean distribution. Two Lytohoplites species, L . burckhardti (Mayer-Eymar in Burckhardt, 1900) (type species) and L . vetustoides (Burckhardt, 1903), were originally described from carbonate successions of the Vaca Muerta Formation, Neuquén Basin...
Article
Upper Jurassic and Lower Cretaceous deposits of the Vaca Muerta Formation (Neuquén Basin, central-west Argentina) have yielded abundant marine reptile remains. Most of them correspond to faunal assemblages recovered from outcrops in the Neuquén Province (Argentina). Herein we report two new marine reptile-bearing localities documenting the Tithonia...
Article
The numerical age of the Jurassic-Cretaceous boundary has been controversial and difficult to determine. In this study, we present high-precision U-Pb geochronological data around the Jurassic-Cretaceous boundary in two distinct sections from different sedimentary basins: the Las Loicas, Neuquén Basin, Argentina, and the Mazatepec, Sierra Madre Ori...
Conference Paper
Full-text available
El análisis geoquímico de los isótopos estables de Oxígeno y Carbono (δ18O, δ13C) en carbonatos inorgánicos permite conocer parámetros paleoceanográficos y paleoambientales del momento en que se produjo su precipitación. La naturaleza carbonática de las conchillas fósiles de moluscos marinos tales como los cefalópodos, bivalvos y gastrópodos, y su...
Article
Full-text available
The age of the Jurassic/Cretaceous boundary has remained elusive for the past decades. In this study we evaluate how well the determined boundary age agrees between two distinct sections from different sedimentary basins, and whether we can constrain a globally valid Jurassic/Cretaceous boundary age. Here we present high-precision U-Pb zircon age d...
Article
The comments by Kietzmann & Iglesia Llanos (Comment on "Tethyan calpionellids in the Neuquén Basin (Argentine Andes), their significance in defining the Jurassic/Cretaceous boundary and pathways for Tethyan-Eastern Pacific connections" by R. López-Martínez, B. Aguirre-Urreta, M. Lescano, A. Concheyro, V. Vennari and V. Ramos) on our paper published...
Article
The study of calpionellid distribution in the well-documented Las Loicas section of the Vaca Muerta Formation in the Neuquén Basin, Argentine Andes, allows the recognition of the upper part of the Crassicollaria Zone and the lower part of Calpionella Zone across the Jurassic/Cretaceous boundary. The Crassicollaria Zone, Colomi Subzone (Upper Tithon...
Article
The earliest records of the genus Spiticeras Uhlig in Western Gondwana occur in the Upper Jurassic–Lower Cretaceous deposits of the Vaca Muerta Formation in the Neuquén Basin, Argentina. Those records involve two species, Spiticeras acutum Gerth and Spiticeras hauthali Gerth, which were firstly described from Arroyo Durazno, Mendoza. A systematic r...
Article
An association of ammonoids and radiolarians retrieved from a sedimentary section of the Vaca Muerta Formation at Vega de Escalone, Neuquén Basin, Argentina, was analized under a strict stratigraphic control. Nine ammonoid assemblage biozones were identified, indicating an age span from Early Tithonian to Late Berriasian/earlymost Valanginian for t...
Conference Paper
Full-text available
En la Sierra de Cara Cura se registran extensos afloramientos del Grupo Mendoza incluyendo perfiles completos de las formaciones Vaca Muerta, Mulichinco y Agrio. El objetivo del presente trabajo es dar a conocer dos asociaciones macrofaunísticas bentónicas del Berriasiano-Valanginiano inferior en base a un perfil de detalle de 77 m de espesor reali...
Article
Ammonoids are the most abundant and diverse group of marine invertebrates present in the Vaca Muerta Formation (early Tithonian - early Valanginian) of the Neuquén Basin (west-central Argentina). A modern systematic review of the late early Tithonian - early middle Tithonian ammonoids of the Vaca Muerta Formation was conducted, focusing on perisphi...
Conference Paper
La Formación Vaca Muerta (Tithoniano inferior – Valanginiano inferior) en la sección de Las Tapaderas está caracterizada por una sucesión rítmica de margas y calizas. Esta sección aflora en el suroeste de la provincia de Mendoza, 20 km al este del límite con Chile y 40 km al norte del paso internacional Pehuenche. La sección se extiende desde la Bi...
Conference Paper
Full-text available
Se actualizan la bioestratigrafía de alta resolución de amonites y nanofósiles calcáreos con análisis U-Pb CA-ID-TIMS en circón del Grupo Mendoza (Formaciones Vaca Muerta y Agrio) del Cretácico temprano de la cuenca Neuquina. Se dan a conocer datos de 87Sr/86Sr en ambas unidades, calibrados a las biozonas de amonites. Los bioeventos reconocidos de...
Conference Paper
Sedimentologic and sequence stratigraphic analysis of the Vaca Muerta and Quintuco Formations in Chos Malal area, Neuquén Basin. The Vaca Muerta-Quintuco system (early Tithonian – early Valanginian) is a broad shallowingupward sedimentary cycle consisting of dark bituminous shales, marls, limestones, and sandstones, cropping out in the Neuquén Basi...
Conference Paper
Facies variation in basal sequences of the Vaca Muerta Formation at its type locality (Sierra de la Vaca Muerta), Neuquén Basin The Vaca Muerta-Quintuco system (early Tithonian – early Valanginian) is a broad shallowing-upward sedimentary cycle consisting of dark bituminous shales, marls, limestones, and sandstones, cropping out in the Neuquén Basi...
Conference Paper
Full-text available
High Resolution Biostratigraphy and Geochronology of the Vaca Muerta Formation, Neuquén Basin In this work we present new results from studies of ammonites and calcareous nannofossils in selected surface sections of the Vaca Muerta Formation that have yielded a precise biochronology on this unit. Furthermore, these studies have been correlated with...
Article
Fossil records of Geosaurini taxa in South American margins of the Eastern Pacific are scarce. We describe a new specimen of Geosaurini found in sedimentites of the Vaca Muerta Formation (Substeueroceras koeneni Biozone, uppermost Tithonian–lowermost Berriasian) and referred it as Dakosaurus cf. D. andiniensis. The close stratigraphic association o...
Article
The Jurassic–Cretaceous (J–K) boundary is poorly constrained, and is the only Phanerozoic system boundary that lacks an internationally accepted reference stratigraphic section (GSSP). Precise radio-isotopic U–Pb data are unavailable for the earliest stage of the Cretaceous— the Berriasian. The age of the Jurassic–Cretaceous boundary was based on s...
Article
Full-text available
The Vaca Muerta Formation in the Cerro Domuyo area shows an interesting intercalation of facies with opposite paleocurrents. The unit is represented by outer ramp to basinal facies with a westward direction of progradation. However, in its middle section, slope deposits correlatable with the Huncal Member, are intercalated with slumped strata vergi...
Article
Los depósitos de la Formación Vaca Muerta en el área del cerro Domuyo muestran una interesante interca-lación de depósitos con paleocorrientes opuestas. La unidad está representada por facies de cuenca y rampa externa con dirección de progradación hacia el oeste. Sin embargo, en su parte media se intercalan depósitos de talud, con desarrollo de des...
Article
Full-text available
A new ammonoid species of the Andean endemic genus Andiceras Krantz is here described from upper Tithonian-lower Berriasian levels of the Vaca Muerta and Chachao Formations of the Mendoza Group, in north-western Mendoza Province, Argentina. Andiceras planulatus sp. nov. lies between the last beds with representatives of the Substeueroceras koeneni...
Article
Full-text available
A new ammonoid species of the Andean endemic genus Andiceras Krantz is here described from upper Tithonian-lower Berriasian levels of the Vaca Muerta and Chachao Formations of the Mendoza Group, in northwestern Mendoza Province, Argentina. Andiceras planulatus sp. nov. lies between the last beds with representatives of the Substeueroceras koeneni A...
Chapter
Full-text available
Se presenta una síntesis de los megainvertebrados fósiles cretácicos organizados en un esquema estratigráfico por pisos, actualizando la información brindada en 1978 en el Primer Relatorio de la Geología del Neuquén. Dada la actual incertidumbre sobre la ubicación del límite Jurásico-Cretácico en términos bioestratigráficos, se provee inicialmente...
Chapter
Full-text available
Cretaceous megainvertebrates and their biostratigraphic significance.- A synthesis of the Cretaceous megainvertebrates is presented by stage. This is an update of the information presented in the first version of the Geology and Natural Recourses of Neuquén published in 1978. A brief summary of the Jurassic-Cretaceous boundary is also provided due...
Conference Paper
El presente trabajo consiste en organizar las biozonas de amonites del Jurásico medio y superior en la cuenca Arequipa, con el objetivo de organizar las líneas de tiempo y elaborar el respectivo mapa paleogeográfico (Alván et al., en prep.). Existen numerosos trabajos de elaboración y asignación biozonal, y numerosas muestras estudiadas (Steinmann,...
Article
Full-text available
The aim of this work is to summarize the modern knowledge of the geology of the Piuquenes Pass, in the Main Andes of Argentina and Chile, and to describe a small fauna of Tithonian-Neocomian invertebrates mostly represented by ammonites. The present knowledge of the region is compared with Darwin's, as expressed in his famous book on the Geology of...
Article
The aim of this work is to summarize the modern knowledge of the geology of the Piuquenes Pass, in the Main Andes of Argentina and Chile, and to describe a small fauna of Tithonian-Neocomian invertebrates mostly represented by ammonites. The present knowledge of the region is compared with Darwin's, as expressed in his famous book on the Geology of...

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Projects (4)
Project
Collect and share information on the Jurassic-Cretaceous "transition" (around Berriasian times) in order to follow up with the discussion on the (re-)location of the system boundary (base Berriasian /Kilian view/, base Valanginian /Oppel view/, or any other option) a fair and open discussion initiated on the occasion of JK2018. Are you interested to join as "collaborators" ? then: ● option 1: register as "followers" of both the project and Bruno Granier --no necessarily on the long term!-- (and you will be added to the list); ● option 2: send your contact information (i.e., your email address) to Prof. Bruno Granier, Brest (Université de Bretagne Occidentale). Would you like to leave the project ... let him know (and that should be promptly fixed). PLEASE do not register as follower if you are not willing to be a collaborator!