Noelia B. Carmona

Noelia B. Carmona
Universidad Nacional de Río Negro | UNRN · Research Institute of Paleobiology and Geology

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62
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Publications

Publications (62)
Article
Contourites are increasingly being recognized in ancient fine-grained depositional environments. However, detailed ichnologic analyses focusing on shallow-water examples of these deposits are scarce. The Upper Jurassic–Lower Cretaceous Vaca Muerta Formation from Argentina constitutes an important unconventional reservoir that displays dm- to m-thic...
Article
Over the last few years, recognition and characterization of sedimentary processes in fine-grained successions is receiving considerable attention in part due to the increased importance of unconventional reservoirs. Recent sedimentologic analyses of these successions have revealed abundant traction transport structures that suggest bottom current...
Article
Infaunalization has been regarded as representing a response to increased predation pressures and is therefore central to the Mesozoic marine revolution, which gives pre-eminence to the role that enemy-directed evolution has played as a driving force of biotic change. Our ichnologic compilation from 39 Middle Triassic to Late Jurassic shallow-marin...
Conference Paper
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Bottom currents induced by thermohaline-, wind-, or tide-driven circulation may occur in shallow waters (50-300 m water depths), such as in outer shelves, upper slopes and shallow sills. The Upper Jurassic-Lower Cretaceous Vaca Muerta Formation in Argentina shows drift deposits located in bottomsets and foresets of a mixed carbonate-siliciclastic,...
Article
Considering the evolution of aeolian to marine transitions for the geological record, either catastrophic or gradual transgressive scenarios showing high or low rates of coastal migration have been proposed. A critical evaluation of modern analogues suggests that a catastrophic transgression shares many characteristics with Holocene transgressions,...
Article
A single 27 m² spatangoid-dominated bed yielding 65 specimens from the Punta Entrada Member of the Monte León Formation was studied. Most of the fossils were preserved oral side down, with clusters of spines attached to the tests, showing no evidence of preburial transport. The deposit is interpreted as the result of sedimentation in a subtidal env...
Article
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The Toarcian - lower Callovian Los Molles Formation in the Chacay Melehue section (southern limb of Cordillera del Viento - Neuquén Basin) comprises offshore-shelf deposits and subordinately, channel-levee and lobe deposits produced by density currents. These deposits are characterized by two distinctive trace fossil suites: (1) Chondrites and Tric...
Article
The upper Valanginian – lower Aptian Centenario Formation is a significant producer of oil and gas in the Neuquén Basin, western Argentina. This formation is located exclusively in the subsurface of the eastern and northeastern Neuquén Basin, and is 450–1000 m thick. The Centenario Formation laterally interfingers with the Agrio Formation. Previous...
Article
Scolicia is one of the most conspicuous trace fossils in lower shoreface deposits of the Miocene Chenque Formation of Patagonia, Argentina. This ichnotaxon consists of horizontal, sinuous or meandering trace fossils with a laminated backfill and two parallel strings located at the base. Abundant body fossils attributed to Brisaster iheringi occur i...
Article
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The reworking of a trace by a subsequently following organism represents a so-called sequorichnial behavior and leads to formation of a “burrowing highway”. Burrowing highways occur more frequently than assumed in the fossil record. Their ichnological and sedimentological meaning is elucidated by using the trace fossil Gyrochorte. Gyrochorte produc...
Article
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Sedimentologic and ichnologic analysis of the Middle Jurassic Lajas Formation in Bajada de Los Molles area allow recognizing upper offshore-lower shoreface deposits in transition to prodelta, delta front and interdistributary bay succesions. This system is classified as a river-dominated delta due to the presence of distributary channel deposits wi...
Article
The Upper Jurassic-Lower Cretaceous Vaca Muerta Formation at the Picún Leufú area constitutes bottomset and foreset marine deposits comprising open bay, siliciclastic basin and mixed carbonate-siliciclastic shelf facies. Detailed sedimentological, ichnological and sequence stratigraphic analysis of six stratigraphic sections allows establishing two...
Conference Paper
Full-text available
El análisis icnológico de los afloramientos de la Formación Los Molles (Jurásico Inferior) en el área de la Cordillera del Viento permitió reconocer dos suites de trazas fósiles, una correspondiente a depósitos de offshore-plataforma, y otra a depósitos de albardones de canales generados por corrientes de densidad. Los depósitos de offshore-platafo...
Conference Paper
Full-text available
The upper Valanginian-lower Aptian Centenario Formation is an important producer of oil and gas in the Neuqeun Basin, western Argentina. The formation is located exclusively in the subsurface of the Neuquen Basin, and averages 450-1000 m in thickness. The Centenario Formation is defined as lateral continuation of the Agrio Formation. The previous s...
Article
Environmental changes within a Neogene coastal dune system are recorded by endobenthic unioniform bivalves that lived in muddy or sandy interdune pond sediments. These bivalves were suspension-filter feeders that formed dense, almost monospecific communities in the wet-interdune deposits of the continental intervals of the Río Negro Formation (late...
Conference Paper
Full-text available
The Vaca Muerta Formation represents marine bottomset and foreset facies of a mixed carbonate-siliciclastic ramp developed during Late Jurassic-Early Cretaceous in the Neuquén Basin, Argentina. Mudstone, marl and limestone deposited in low-energy, oxygen-deficient settings constitute the main lithologies of this formation. The present contribution...
Article
The Miocene deposits in the Punta Basílica locality, southernmost Argentina, are included within the Cabo Viamonte Beds, Cabo Domingo Group, in the Austral foreland basin of Tierra del Fuego province. The prograding clinoform systems were accumulated during a weak compressional tectonic regime that allowed the development of a narrow shelf. Paleoen...
Article
Shorefaces can display strong facies variability and integration of sedimentology and ichnology provides a high-resolution model to identify variations among strongly storm-dominated (high energy), moderately storm-affected (intermediate energy), and weakly storm-affected (low energy) shoreface deposits. In addition, ichnology has proved to be of h...
Conference Paper
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An integrated sedimentological and ichnological analyisis of the Vaca Muerta Formation
Chapter
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The Mesozoic Marine Revolution (MMR) was a major evolutionary episode involving the large-scale restructuring of shallow-marine benthic communities and the rise to dominance of the Modern Evolutionary Fauna. Although the majority of studies published on the MMR have been based on the body-fossil record, the ichnologic record yields valuable insight...
Book
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The Neuquén basin, one of the largest hydrocarbon producers in the southern portion of South America, it is located east of the Andes, in the north of Patagonia. It covers an area of more than 45000 sqmi in the central west of Argentina and contains a record stratigraphic, 18,000 ft thicknesses, with ages ranging from Triassic to the Paleogene. The...
Article
There are few recognized examples of fluvial-dominated deltaic systems affected by hyperpycnal discharges. The development of predictive models in those systems are essential to understand the distribution of sedimentary facies and for determining the location of the main sandy bodies, which constitute the potential hidrocarbon reservoirs. In Porta...
Article
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Ichnologic and sedimentologic studies of the Lajas Formation (Middle Jurassic) in Sierra de la Vaca Muerta allowed the recognition of two different types of deltaic mouth bars, each of them showing trace fossil suites with different characteristics. Type I deltaic mouth bars consist of fine to coarse sandstones and fine conglomerates completely rew...
Article
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El estudio de matas microbianas en ambientes marinos costeros silicoclásticos actuales constituye una importante fuente de información para el análisis de análogos fósiles. En el estuario de Bahía Blanca se estudiaron planicies de marea cubiertas por matas desde un enfoque geobiológico, con el objetivo de identificar y describir estructuras inducid...
Article
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The beginning of the Cambrian was a time of marked biological and sedimentary changes, including the replacement of Proterozoic-style microbial matgrounds by Phanerozoic-style bioturbated mixgrounds. Here we show that Ediacaran-style matground-based ecology persisted into the earliest Cambrian. Our study in the type section of the basal Cambrian in...
Article
The study of microbial mats in modern siliciclastic coastal marine settings represents an important analogue for the analysis of fossil deposits in similar paleoenvironments. In the Bahía Blanca estuary, mat-covered tidal flats were studied from a geobiological perspective with the aims of identifying and describing microbially-induced sedimentary...
Article
The arrangement of sediment couplets preserved in Thalassinoides shafts suggests that tides regulated the passive filling of these trace fossils and, thus, represent tubular tidalites. The thickness variation of individual layers and couplets implies a mixed diurnal, semi-diurnal tidal signature where packages of either thick-layered or thin-layere...
Article
Full-text available
Biofilms and microbial mats cover the tidal flats of the central zone of the Bahía Blanca estuary (Argentina), creating extensive layers. The objective of this study was to characterize the microphytobenthic communities in these biofilms and mats from sediment cores taken in March, June, September and December 2010. Microorganisms were identified a...
Article
The extensive matgrounds in Carboniferous-Permian open-marine deposits of western Argentina constitute an anachronistic facies, because with the onset of penetrative bioturbation during the early Paleozoic microbial mats essentially disappeared from these settings. Abundant microbially induced sedimentary structures in the Argentinean deposits are...
Article
Microbially induced sedimentary structures (MISS) result from the interaction between benthic microorganisms and sediments; MISS preferably form in upper intertidal to supratidal settings from the Archean to the modern. The identification of MISS in Neogene deposits of the Rio Negro Formation (Late Miocene to Pliocene), Rio Negro Province, Argentin...
Article
The preservation and cementation of sedimentary structures under the influence of microorganisms in siliciclastic environments have been poorly studied in contrast to carbonatic settings, where they have been extensively investigated. Whereas in carbonatic environments, microbial mat-induced precipitation of calcium carbonate results in a cementati...
Chapter
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Neogene deposits from Patagonia are characterized by extremely diverse ichnofaunas, including a great variety of feeding (e. Protovirgularia) and equilibrium/ escape structures (e.g., Scalichnus) occur. Trace fossils in open-marine deposits are abundant and diverse, with extremely complex tiering structures, and most commonly characterized by the p...
Book
Full-text available
Ichnology, the study of traces, is a fast growing field that feeds from different and diverse disciplinessuch as sedimentology, stratigraphy, biology andpaleontology. The special publication “Ichnology of Latin America - Selected Papers” arose after the Latin American Symposium on Ichnology 2010 (SLIC2010) that was held from October 30th to November...
Article
In this paper we present an outcrop example of coarse-grained sediment waves generated by hyperpycnal discharges at the toe of Miocene clinoform systems exposed in the northeast Atlantic coast of Tierra del Fuego, Argentina. An individual set of these sediment waves is formed during the waxing and waning phases of the hyperpycnal discharge. During...
Article
Extensive microbial mats have been found in the siliciclastic tidal flats of the temperate Bahía Blanca estuary in the Atlantic coast of Buenos Aires province, Argentina. Several microbially induced sedimentary structures (MISS) occur especially in the upper intertidal and lower supratidal flats, among which the most conspicuous are erosional pocke...
Book
Field studies in a siliciclastic mesotidal flat in Bahia Blanca Estuary, Argentina, reveal the presence of extensive areas with microbial mats, covering the upper intertidal and lower supratidal areas. Study of recent environments with microbial mats has increased considerably in recent years, not only because of their unique sedimentologic and eco...
Article
Full-text available
Lower Miocene tide-influenced deltaic deposits from the Chenque Formation, Patagonia, Argentina, contain abundant and well-preserved biogenic structures attributed to locomotion of deposit-feeder protobranch bivalves. These trace fossils, assigned to the ichnogenus Protovirgularia, consist of delicate, inclined-to-horizontal, chevronate structures,...
Article
Full-text available
Lower Miocene tide-influenced deltaic deposits from the Chenque Formation, Patagonia, Argentina, contain abundant and well-preserved biogenic structures attributed to locomotion of deposit-feeder protobranch bivalves. These trace fossils, assigned to the ichnogenus Protovirgularia , consist of delicate, inclined-to-horizontal, chevronate structures...
Article
Full-text available
Combined sedimentologic and ichnologic analysis of the Lower Miocene Chenque Formation allows recognition of a tide-influenced deltaic succession exposed along the coast of Caleta Olivia city, Patagonia, Argentina. Two main subenvironments were identified, prodelta and delta front, stacked forming a progradational coarsening-upward succession, up t...
Article
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The systematics, paleoenvironmental implications, and diversity of Cenozoic trace fossils from the Fuegian Andes are studied. The relatively complete Paleocene-Miocene stratigraphic column includes ichnoassemblages of the Cruziana (Leticia Formation, late Middle Eocene), Zoophycos and Nereites (Early Eocene-Early Miocene turbidite systems) ichnofac...
Article
Full-text available
The lower Miocene Chenque Formation of Patagonia contains superbly preserved and diverse ichnofaunas, including the ichnogenera Asterosoma, Balanoglossites, Chondrites, Gastrochaenolites, Gyrolithes, Helicodromites, Macaronichnus, Nereites, Ophiomorpha, Palaeophycus, Phycosiphon, Planolites, Protovirgularia, Rhizocorallium, Rosselia, Schaubcylindri...
Article
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Ichnofossils developed in a firmground at the contact between the middle Eocene–lower Miocene continental Sarmiento Formation and the lower Miocene marine Chenque Formation, in central-eastern Patagonia, Argentina, are assigned to Gastrochaenolites ornatus Kelly and Bromley [Kelly, S.R.A., Bromley, R.G., 1984. Ichnological nomenclature of clavate b...
Article
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This study focuses on the ichnologic and stratigraphic characteristics of the boundary surface between the Sarmiento (middle Eocene- early Miocene) and Chenque Formations (early Miocene). The analyzed outcrops are located near Comodoro Rivadavia city, Chubut Province, Patagonia, Argentina. The studied boundary represents a co-planar surface of low-...
Article
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A new ichnospecies of Arthrophycus Hall 1852, A. minimus, is described from Upper Cambrian-Lower Tremadocian, shallow-marine strata of northwest Argentina. This new ichnospecies consists of small, long, regularly annulated hypichnial elements displaying subcircular to squarish cross-section and a ventral median groove. Side branches are occasionall...
Article
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Trace fossils assigned to the activity of decapod crustaceans are well known from the stratigraphic record. Changes in abundance and ichnodiversity of these structures through the Phanerozoic have been analysed. A database summarising trace fossil occurrences was compiled. This information is interpreted with respect to the life history of burrowin...
Article
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Ichnology of shallow marine deposits in the Miocene Chenque Formation of Patagonia: complex ecologic structure and niche partitioning in Neogene ecosystems
Article
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Estructuras biogénicas de crustáceos en el Mioceno de la cuenca del Golfo San Jorge: implicancias paleobiológicas y evolutivas