Veronica Vennari- PhD in Geological Sciences
- Researcher at CONICET (CCT Mendoza)
Veronica Vennari
- PhD in Geological Sciences
- Researcher at CONICET (CCT Mendoza)
About
52
Publications
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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.
Current institution
CONICET (CCT Mendoza)
Current position
- Researcher
Additional affiliations
August 2015 - present
IANIGLA - CONICET
Position
- Assistant researcher
January 2011 - August 2015
Education
March 2003 - March 2013
Publications
Publications (52)
A new Valanginian ammonoid fauna from the Vaca Muerta Formation in the Neuquen Basin is described and illustrated. It includes Bochianites neocomiensis (d’Orbigny), which is recorded for the first time in the lower Valanginian Lissonia riveroi Zone where it is associated with the Andean species L. riveroi (Lisson),
and less commonly with Raimondice...
Here we study the variation of the Paleozoic to Mesozoic ammonoid whorl profile shape (WPS, in previous contributions referred as the whorl cross-section shape) employing a geometric morphometric approach, virtual modelling, and statistical tools to assess possible biological phenomena. For this approach, a dataset covering 300 individuals (each be...
Belemnites were a group of Mesozoic coleoids with a global distribution from the Early Jurassic to the Late Cretaceous. During the Late Jurassic–Early Cretaceous, Gondwana's marine shelves were dominated by Belemnopsis and Hibolithes populations. In contrast to the Austral Basin, where both genera are quite common, their record in the Neuquén Basin...
El hallazgo de un ictiosaurio oftalmosáurido relativamente completo junto con una buena exposición en vista en planta (Biozona de Substeueroceras koeneni, Tithoniano tardío-Berriasiano temprano) permitió realizar un relevamiento tafonómico tanto del esqueleto como de su macrofauna asociada. Se confeccionó un mapa de detalle de los elementos óseos y...
A state of the knowledge of the Andean cycle is presented, mainly based on our recent works, but also on highlights of recent research of many colleagues. This synthesis allowed us to update the geochronology of its different units. New absolute ages through U-Pb analysis in zircons by different methods complement those previously carried out and m...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
