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Introduction
Karen Halpern currently works at the Instituto de Geología de Costas y del Cuaternario (IGCyC), Universidad Nacional de Mar del Plata. Karen does research in Marine Paleoecology. Active participant in diverse projects about Geoparks, Late Carboniferous brachiopods and bivalves response to the Late Paleozoic Ice Age in Argentina and eventually working in Ordovician and Silurian brachiopods of Argentina, as result of doctoral research.
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March 2010 - March 2015
April 2010 - March 2015
Publications
Publications (35)
Stratigraphic and ichnological evidence of synoptic surfaces developed during stasis periods from deltaic successions are poorly reported. Synoptic surfaces representative of prolonged stasis are typically highly bioturbated. A combined sedimentological and ichnological analysis undertaken along a down-dip-oriented transect of the Balcarce Formatio...
El Instituto de Geología de Costas y del Cuaternario "Dr. Enrique Jorge Schnack" cuenta con más de cuatro décadas de historia. En este tiempo, diferentes investigaciones requirieron de numerosas campañas que implicaron el muestreo de fósiles. Si bien estos materiales se encuentran resguardados, no están catalogados. Contemplando su trayectoria, el...
Libro centrado en los problemas y desafíos de la comunicación pública de las ciencias. Incluye una presentación de Tristán Simanauskas y capítulos de Raúl Fernández, Bernardo Daniel Taverna, Karen Halpern, Cristina Beatriz Fernández y Alejandro Morea. Entrevistas realizadas a Claudio Martínez, Guadalupe Díaz Costanzo, Dora Barrancos, Alejandro Katz...
Knowing the present is essential for interpreting the past. This is a great Earth Sciences concept that applies to almost every study. But can actualistic taphonomy contribute to the understanding of deep-time? It is well known that rhynchonellid brachiopod species are scarce nowadays, but during Paleozoic times they were a dominant component of th...
La participación de las mujeres en ciencia es, en términos narrativos, una construcción subjetiva y parcial desarrollada en momentos particulares de la historia de la humanidad. Los relatos tradicionales describen a las mujeres científicas como sujetos sumisos, con poca participación, en roles secundarios, o no las mencionan. Cuestionando esta prem...
The Río del Peñón Formation in the Argentine Precordillera provides an excellent stratigraphic and paleontological Pennsylvanian record that reflects the paleoclimate and paleoenvironmental conditions that characterized this part of Gondwana. A rich and diverse invertebrate marine fauna associated with diagnostic mega-micro flora has been described...
True substrate surfaces represent bedding planes that were sediment-water or sediment-air interfaces at the time of deposition. Despite being considered rare, they are more often found in the field than mentioned in the literature. These surfaces are genuine windows to past time lapses when biota interacted with the substrate. That is why one of th...
Sequence-stratigraphic surfaces in shallow-marine successions are evidenced by vertical changes in the facies stacking pattern related to shoreline shifts (regression and transgression). Then, identifying vertical changes of facies variability requires determining deepening or shallowing relationships, mostly interpreted from abrupt textural change...
The widely distributed Balcarce Formation (Tandilia System, southeastern Argentina) outcrops represent a shallow epicontinental sea with tidal influence, hosting a diverse ichnofauna. Previous research recognizes an Early Paleozoic age with certainty, and so far, the presence of Cruziana bonariensis suggests that it is probably Silurian. Further su...
Although vertebrate carcasses––particularly those assigned to fishes––are abundant in the fossil record, the literature rarely mentions fishes as trace producers. Herein we present evidence that was possibly overlooked in previous studies. Study of more than 100 large, shallow, teardrop-shaped, imprints that are aligned, with few overlapping each o...
Reconocida por ser portadora de una gran variedad de trazas fósiles, la Formación Balcarce (Ordovícico–Silúrico) está compuesta por cuarcitas de origen marino. Sus rocas afloran en las serranías del Sistema de Tandilia, en el sudeste de la provincia de Buenos Aires. Además, están presentes en los bloques—obtenidos mediante la actividad minera local...
The brachiopod and bivalve assemblages from coeval glacio-marine deposits of the Hoyada Verde (HV) and El Paso (EP) formations (late Serpukhovian-Bashkirian, Calingasta-Uspallata basin) have been thoroughly studied from taxonomic, biostratigraphic, and classical paleoecological views. Given their close geographical location, the marked compositiona...
Despite being coeval faunas from the Levipustula levis biozone from the Late Paleozoic western central Argentinian basins, Levipustula and Aseptella-Tuberculatella/ Rhipidomella-Micraphelia (AT/RM) associations show high compositional differences suggesting that their wide vs. restricted distribution is probably linked to a set of abiotic factors....
The Eurydesma Fauna characterizes the Late Pennsylvanian-Permian glacial-postglacial sediments recorded in several Gondwanan basins during the Late Paleozoic Ice Age (LPIA). Brachiopods, as one the most significant components of this fauna, are herein analyzed along with the associated bivalves, in two key sections from western and eastern Gondwana...
The Eurydesma Fauna characterizes the Late Pennsylvanian-Permian glacial-postglacial sediments recorded in several Gondwanan basins during the Late Paleozoic Ice Age (LPIA). Brachiopods, as one the most significant components of this fauna, are herein analyzed along with the associated bivalves, in two key sections from western and eastern Gondwana...
The growth and demise of glaciers during the Late Paleozoic ice age had profound consequences on the marine biota. In central western Argentina the transition from glacial to non-glacial interval during the Pennsylvanian, caused a major regional turnover which remodeled the bathymetric diversity gradient. In order to understand the nature of the en...
In Buenos Aires province, there is a big contrast between a wide range of geodiversity and the lack of geological protected areas. Considering its valuable geoheritage, there is a current necessity to promote the development of geological parks. Thus, the assessment and proposal of this kind of sites becomes of paramount importance in order to dete...
In Buenos Aires province, the existing geodiversity contrasts with the scarcity of protected areas in this region, considering its high geoheritage value. These characteristics expose the necessity to promote the development of geological parks since are established in the geographic area. Thus, the identification and valuation of sites of geologic...
Major ecological transitions among evolutionary faunas are matters of continual debate. Our study analyses the timing and mode of replacement of Ibex I and II Trilobite Evolutionary Faunas (TEF) in Lower Ordovician successions of northwestern Argentina, with special emphasis on olenids and asaphids as key groups of the Ibex I and Ibex II faunas, re...
Develompment of an educational, recreational and sport geocircuit in Balcarce City: value increased of local
geodiversity. In past few years, there has been an increasing demand from the general public for the understanding of the landscape. To meet this need, our university research and outreach projects promote the assessment of areas of scientif...
During the late Palaeozoic ice age (LPIA), ice-proximal marine regional communities record contrasting responses to climate change compared to ice-distal communities. However, there is still much to be understood in distal regions in order to fully understand the palaeobiological consequences of the LPIA. Here, were analyse brachiopod and bivalve e...
A shelly fauna from the upper part of the Zapla glacial diamictite includes thelingulate brachiopod Orbiculoidea radiata Troedsson, the rhynchonelliforms Dalmanella cf. testudinaria (Dalman) and Paromalomena sp., the bivalve Modiolopsis? sp., and the trilobite Dalmanitina subandina Monaldi and Boso. Both taphonomic and paleoecologic data indicate a...
A shelly fauna from the upper part of the Zapla glacial diamictite includes the lingulate brachiopod Orbiculoidea radiata Troedsson, the rhynchonelliforms Dalmanella cf. testudinaria (Dalman) and Paromalomena sp., the bivalve Modiolopsis? sp., and the trilobite Dalmanitina subandina Monaldi and Boso. Both taphonomic and paleoecologic data indicate...
Abstract. Two bryozoan taxa occurring in the Hirnatian (Upper Ordovician) deposits in western Argentina document a first postglacial community associated with an intermediate to high latitude brachiopod assemblage, known as the typical Hirnantia fauna, in the Argentine Precordillera. Helopora fragilis (Hall, 1852) and an indeterminate phyloporinid...
ABSTRACT – An odontopleurid trilobite remain is described for the fi rst time from Hirnantian (uppermost Ordovician) rocks of Western Gondwana. Very rare material, represented by a single left librigena, comes from a new fossil locality of the Don Braulio Formation in the Eastern Argentine Precordillera. Based on an updated systematic discussion, t...
Silurian and Devonian corals occur abundantly in siliciclastic rocks of the Argentine Precordillera. They are distributed along a Silurian storm-dominated shallow-water platform, a transitional restricted nearshore environment, and a Devonian muddy platform setting. Four main associations of rugose and tabulate corals have been recorded: a Silurian...
Examination of newly collected brachiopods from the Eusebio Ayala Formation of Paraguay reveals the occur-rence of Arenorthis paranaensis sp. nov., Plectothyrella? itacu-rubiensis sp. nov., Hindella sp. and Eostropheodonta conradii (Harrington). Associated graptolites of the N. persculptus Zone indicate that the age of the fossiliferous beds is Hir...
