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Publications (457)
Bioerosion trace fossils are biogenic structures that record evidence of behaviour in hard substrates, including bone. While bioerosion trace fossils on bones produced by animals have been well documented globally throughout the Mesozoic and Cenozoic, studies on such structures created by ancient plants are less common. Herein, we document an incom...
The Lower Devonian Talacasto Formation in western Argentina records deposition in wave-dominated shallowmarine environments. This unit comprises a large-scale progradational succession, transitioning from black, parallel-laminated mudstone in the lower interval to siltstone and very fine- to medium-grained sandstone in the upper interval. The succe...
The Cambrian explosion was a time of groundbreaking ecological shifts related to the establishment of the Phanerozoic biosphere. Trace fossils, which are the products of animals interacting with their substrates, provide a key record of the diversification of the benthos and the evolution of behavioral complexity through this interval. The Chapel I...
Extensive ichnologic and sedimentologic datasets were gathered from six localities (Fortune Head, Fortune North, Grand Bank Head, Lewin's Cove, Little Dantzic Cove, and Point May) of the Ediacaran–Cambrian Chapel Island Formation at Burin Peninsula, south-eastern Newfoundland, eastern Canada. 1,708.2 m of sedimentary strata were logged at a centime...
Biogenic sedimentary structures offer a unique perspective for understanding the role of the biosphere in the interaction with other Earth subsystems and the building up of our planet. The record of their ancient equivalents provides a wealth of information for reconstructing the role of bioturbators as ecosystem engineers using multiple ichnologic...
Trace-fossil distribution within the framework of three-dimensional fluvial architecture has been commonly overlooked. The Miocene Vinchina Formation in western Argentina preserves extensive outcrops of fluvial deposits, including architectural elements of both anastomosing and braided systems identified along the Quebrada de La Troya. Multistorey...
En los acantilados entre las playas de Munielles y Bahínas aflora la Formación Areniscas de Furada (Formación Furada), la cual marca el tránsito entre el Silúrico y el Devónico. Estos depósitos se acumularon en un ambiente marino somero afectado por sedimentación episódica, en parte como resultado de tempestades. Sobre la base del estudio de materi...
The marine profile can be subdivided from top to bottom into mixed, transition, and historic layers. The former two represent the layer of homogeneous rapid mixing and the layer of heterogeneous mixing containing discrete traces, respectively. The historic layer occurs below the transition layer and constitutes a zone of inactive bioturbation conta...
The Los Cabos Group comprises 3000-4500 m-thick middle Cambrian to Lower Ordovician shallow-marine deposits in Asturias, Spain [1], constituting distal deposits of the well-known "Armorican Quartzite" of Iberia and France. The formation holds enormous potential to analyze paleoecological controls and the evolution of trace fossils in mud-rich shall...
The Central Andean Basin comprising northwestern Argentina, northern Chile, western Bolivia, and southern Perú is well known for the presence of highly fossiliferous upper Cambrian-Lower Ordovician rocks. The occurrence of both body and trace fossils in the same outcrops allows to better constrain the age of animal-substrate interactions. The aim o...
The earliest Paleocene Salamanca Formation [1] is located within the Golfo San Jorge Basin, Chubut Province, Patagonia, Argentina. Outcrops of the Salamanca Formation represent a low-energy coastal transitional environment subject to tidal influence. The Paleocene is marked by progradation of shallow- and marginal-marine systems resulting in the ac...
Exceptional paleosurfaces preserving fecal casting mounds occur in the Upper Jurassic Lastres Formation of Spain. As in modern shorelines, these biogenic structures are associated with straight to sinuous-crested ripples showing the interplay of biological and physical processes in a low-energy marine environment. These trace fossils display charac...
Trace fossils from Ordovician deep-marine environments are typically produced by a shallow endobenthos adapted to live under conditions of food scarcity by means of specialized grazing, farming, and trapping strategies, preserved in low-energy intermediate to distal zones of turbidite systems. High-energy proximal zones have been considered essenti...
The Agronomic Revolution of the early Cambrian refers to the most significant re-structuration of the benthic marine ecosystem in life history. Using a global compilation of trace-fossil records across the Ediacaran-Cambrian transition, this paper investigates the relationship between the benthos and depositional environments prior to, during, and...
The Buda Formation is a coccolith-rich carbonate unit deposited in lagoonal waters of the Comanche Shelf during the early Cenomanian. This unit constitutes a long-lived hydrocarbon reservoir and an important regional marker in the Texas Gulf Coast Basin. Several sedimentological and stratigraphic studies have been carried out on this formation but...
In most oxygen-deficient ancient successions, Chondrites and Zoophycos are typical and recurrent trace fossils that are the last to disappear during deoxygenation events. Here, we report an unusual case of an oxygen-deficient ichnofauna lacking Chondrites and showing scarce Zoophycos, from the Upper Jurassic-Lower Cretaceous Vaca Muerta Formation o...
Oxygen concentration in the ocean is vital for sustaining marine ecosystems. While the potential impacts of deoxygenation on modern oceans are hard to predict, lessons can be learned from better characterizing past geological intervals formed under a greenhouse climate. The greenhouse Cretaceous containing several oceanic anoxic events characterize...
Bioerosion trace fossils are biogenic structures that record evidence of behaviour in hard substrates, including rocks, wood, shells, and bones. While bioerosion trace fossils on vertebrate bones by animals have been well documented globally throughout the Mesozoic and Cenozoic, studies on bioerosion structures created by ancient plants are less co...
Wenger, F.D., Buatois, L.A., Mángano, M.G., Muñoz, D.F., Rustán, J.J. (21-24 November 2023). Lower Devonian ichnofacies in the Argentinean Precordillera: Distribution and paleoenvironmental implications. V Simposio Latinoamericano de Icnología. Universidad del Mar, Puerto Escondido, Oaxaca, México.
Muddy contourites and fluid mud flow deposits are typical sedimentary products
in distal, organic carbon-rich, fine-grained successions around the World.
However, differentiation of muddy deposits is commonly hampered by their poor
outcrop preservation and lack of comprehensive facies models. A sedimentologic
and ichnologic analysis carried out in...
In the last decade, sedimentologic studies have shown that bioturbation by small organisms may produce laminated intervals in muddy successions, which has been regarded as analogous to cryptobioturbation in modern sands. However, compaction and lack of discrete trace fossils in mudstones preclude a clear differentiation between lamination generated...
Wenger, F.D., Buatois, L.A., Mángano, M.G., Muñoz, D.F., Rustán, J.J., 2023. Sedimentary facies and trace fossils from the Lower Devonian shallow marine Talacasto Formation of Precordillera: XVIII Reunión Argentina de Sedimentología - IX Congreso Latinoamericano de Sedimentología, Proceedings, v. 1, p. 232. ISBN 978-631-90299-0-1
Most Phanerozoic mass extinctions record an ichnodiversity reduction, a decrease in bioturbation intensity, small burrow sizes, and reduced burrow penetration. Studies of trace fossils of the Late Ordovician Mass Extinction (LOME) and its subsequent faunal recovery are scarce. The intracratonic Paraná Basin of southern Brazil hosts deposits of the...
Como parte de la evaluación de distintas estrategias para lograr una revista más fuerte y más competitiva, a principios de 2022 el Comité Editorial envió una encuesta anónima, para socios y no socios, donde se consultó sobre la aceptación del pasaje de la revista al idioma inglés. Esta encuesta iba a ser discutida como parte de una actividad dentro...
ABSTRACT
The new ichnotaxon Bromleyia magnifica n. igen., n. isp., attributed to the feeding activity of bivalves, is proposed. This ichnotaxon consists of clusters of closely spaced curved ridges that form a fan-shaped structure oppositely distributed on both sides of a longitudinal axis or, more rarely, being present only on one side. Intergradat...
The fossil record of deep-marine environments is notoriously poor in comparison with that of their shallow-marine counterparts. Notably, deep-marine deposits are typically host to diverse and abundant trace-fossil assemblages, providing evidence of the ancient deep-sea benthos. To analyze the early colonization of the deep sea, we constructed a glo...
Estuarine deposits of the Furongian Pico de Halcón Member of Argentina contain trace and body fossils that allow assessing the role of evolutionary and environmental factors on early colonization of marginal-marine environments. The outer region of the estuary was characterized by a subtidal sandbody flanked by tidal flats. Vertical burrows of susp...
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The continuous rise in hydrocarbon demand, the production decline in conventional oilfields, and the remarkable improvement in extraction methods have allowed the hydrocarbon industry and subsequently, geoscientists, to turn to studies on both unconventional and mature fields with untapped potential. In such reservoirs, the application of advanced...
Black shale studies have traditionally highlighted the impact of basin circulation in the stratigraphic and sedimentologic record of ancient basins, due to its effect in the distribution of sediments and the renewal of deep water masses. A sedimentologic and ichnologic analysis was carried out in the Vaca Muerta Formation fine-grained clinoform sys...
In fine-grained deposits, benthic oxygen-deficiency and soupy substrates during deposition, combined with high compaction during diagenesis, preclude preservation of discrete bioturbation structures, hindering a clear assessment of paleoecologic conditions. The Vaca Muerta Formation of Argentina represents an excellent example to characterize trace...
Trilobites were recovered from four cores of the middle Cambrian Earlie Formation in southwestern Saskatchewan. Fossils occur in silty mudstone with interbedded siltstone and limestone, deposited in the inner detrital belt of the craton interior, under low-energy, subtidal conditions. Taxa identified include Kootenia dawsoni (Walcott 1889), Asaphis...
Shelf-edge-delta clastic wedges are reported to be deposited under a set of environmental factors that represent high to extreme physicochemical stressors on the benthos. Such elevated stress factors engender highly impoverished ichnological suites for individual sedimentary subenvironments. Shelf-edge delta deposits also demonstrate its characteri...
Shelf-edge-delta clastic wedges are reported to be deposited under a set of environmental factors that represent high to extreme physicochemical stressors on the benthos. Such elevated stress factors engender highly impoverished ichnological suites for individual sedimentary subenvironments. Shelf-edge delta deposits also demonstrate its characteri...
Studies dealing with the colonization window typically emphasize two major features: duration (short term vs. long term) and frequency of colonization (episodic vs. continuous). However, our understanding of tide-influenced meander loops requires consideration of an additional feature, the architecture of the colonization window, which comprises no...
The Ediacaran-Cambrian transition interval is described for the west part of the Gond-wana Supercontinent. This key interval in Earth's history is recorded in the upper and lower part of the Tagatiya Guazú and Cerro Curuzu formations, Itapucumi Group, Para-guay, encompassing a sedimentary succession deposited in a tidally influenced mixed carbonate...
Bioturbating organisms can dramatically alter the physical, chemical, and hydrological properties of the sediment and promote or hinder microbial growth. They are a classic example of “ecosystem engineers” as they alter the availability of resources to other species. Multiple evolutionary hypotheses evoke bioturbation as a possible driver for histo...
In 1992, the Chapel Island Formation at Fortune Head was selected as the Cambrian GSSP, which was placed at the first appearance of the ichnotaxon Treptichnus pedum. Although the transition from the Ediacaran to the Cambrian was well studied in Fortune Head and Grand Bank Head, it is also exposed at Lewin’s Cove and Point May. Here, we report new i...
Cruziana stratigraphy is a useful tool for Paleozoic successions lacking body fossils, mainly in “Grès Armoricain”-type lithologies. However, precise calibration of trilobite trace fossils relies on fossiliferous interbedded strata providing high-resolution biostratigraphic information. In particular, the stratigraphic range of Cruziana rugosa rugo...
Fine-grained sediments deposited under oxygen-deficient conditions are enriched in organic matter and hold considerable economic interest as unconventional reservoirs. The present analysis integrates sedimentological, ichnological, and geochemical datasets to understand depositional processes in the Upper Jurassic–Lower Cretaceous Vaca Muerta Forma...
Trace fossils are traditionally regarded as biogenic sedimentary structures showing long stratigraphic ranges and narrow environmental tolerance. However, trace fossils also reveal evolutionary changes through geologic time and have proven their utility in early Paleozoic biostratigraphy, notably across the Ediacaran-Cambrian boundary interval. At...
A uniform approach to ichnotaxonomy has been for the most part positively received by the scientific community. We carry it further here, presenting a revised treatment of trace fossil groups. These should include cololites and regurgitalites as well as root traces. Signs of human technology may be seen as traces; however, they should not be named...
The intensity, extent, and ecosystem-level impact of bioturbation (i.e. Agronomic Revolution) at the dawn of the Phanerozoic is a hotly debated issue. Middle Cambrian fan-delta deposits in southwestern Saskatchewan provide insights into the paleoenvironmental extent of the Agronomic Revolution into marginal-marine environments. The studied deposits...
The Chengjiang biota (Yunnan Province, China) is a treasure trove of soft-bodied animal fossils from the earliest stages of the Cambrian explosion. The mechanisms contributing to its unique preservation, known as the Burgess Shale-type preservation, are well understood. However, little is known about the preservation differences between various ani...
Trace-fossil assemblages reflect the response of the benthos to sets of paleoenvironmental conditions during and immediately after sedimentation. Trace fossils have been widely studied in pelagic shelf and deep-sea chalk deposits from around the globe but never documented from ancient lagoonal chalk successions. Here we report the first detailed ic...
The mixed layer is a zone of fully homogenized sediment resulting from intense bio-turbation. Below this zone, a transitional layer is characterized by discrete burrows. In modern settings, the mixed layer thickness varies according to depositional environments and controlling factors impacting on the benthos. The mixed layer was originally thought...
La Revista de la Asociación Geológica Argentina es una fuente de consulta obligatoria para comprender la geología de nuestro país. Muchos trabajos de trascendencia han sido publicados en la revista desde su creación en 1945. Su propósito original era difundir la labor científica de los miembros de la asociación, pero rápidamente la revista pasó a c...
Until very recently, the early Alpine Permian-Triassic tectono-sedimentary phases preserved in the Cantabrian Mountains have suffered from important stratigraphic mismatches and wrong tectonics interpretations. The lack of precise ages and misunderstanding of the stratigraphical units were the main causes behind these problems. In consequence, the...
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...
Synopsis
The invasion of the land was a complex, protracted process, punctuated by mass extinctions, that involved multiple routes from marine environments. We integrate paleobiology, ichnology, sedimentology, and geomorphology to reconstruct Paleozoic terrestrialization. Cambrian landscapes were dominated by laterally mobile rivers with unstable b...
Text 100-500 words: In the last decades, new advancements on mud sedimentology triggered a renewed interest on fine-grained depositional systems. Of these, organic-rich systems are of special importance for unconventional reservoir exploration and development. The Upper Jurassic-Lower Cretaceous Vaca Muerta Formation from Argentina represents one o...
In the stratigraphic record, contourites are traditionally described in deep water systems associated with global wind-or thermohaline-driven circulation. However, modern systems show sedimentary bodies deposited by contour currents also in shallow waters (e.g., on the shelves and slopes of the Mediterranean Sea). The Upper Jurassic-Lower Cretaceou...
The Vaca Muerta Formation (Neuquén Basin, Argentina) is one of the most prolific unconventional shale reservoirs in the world, being exploited since more than a decade (Minisini et al., 2020). The Formation is composed by Upper Jurassic to Lower Cretaceous, mixed carbonate-siliciclastic, fine-grained clinoforms affected by severe anoxia. A sediment...
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...
Changes in diversity of trace fossils through time provide information about evolutionary innovations in animal‐substrate interactions. Global ichnodiversity changes at ichnogeneric rank are useful to capture major trends, but may be insufficient to reveal minor behavioural innovations. A quantitative analysis of ichnodiversity trajectories at ichn...
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...
The Cenomanian Buda Limestone is a distinctive rock formation widely distributed in Texas and its neighboring regions. The extensive character and regional significance of this unit make the Buda Limestone a key stratigraphic datum in the Texas Gulf Coast Basin. Detailed sedimentologic and stratigraphic studies of this formation were mostly focused...
Spiral burrows perpendicular to the bedding plane are well known in the fossil record and are usually referred to the ichnogenus Gyrolithes. Common in Mesozoic and Cenozoic marginal-marine, brackish-water deposits, the only records of Gyrolithes in Paleozoic rocks are from the Cambrian. In Permian rocks of the Paraná Basin (Rio do Sul and
Rio Bonit...
The Chengjiang Biota is the earliest Phanerozoic soft-bodied fossil assemblage offering the most complete snapshot of Earth's initial diversification, the Cambrian Explosion. Although palaeobiologic aspects of this biota are well understood, the precise sedimentary environment inhabited by this biota remains debated. Herein, we examine a non-weathe...
The Early Ordovician is a key interval for our understanding of the evolution of life on Earth as it lays at the transition between the Cambrian Explosion and the Ordovician Radiation and because the fossil record of the late Cambrian is scarce. In this study, assembly processes of Early Ordovician trilobite and echinoderm communities from the Cent...
Taphrhelminthopsis was originally introduced for trace fossils with a bilobate lower surface recorded in post-Paleozoic deep-marine deposits but has more recently been reinterpreted convincingly as a preservational variant of Scolicia. However, Taphrhelminthopsis has also been used for Cambrian shallow-marine trace fossils, whose taxonomic affinity...
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,...
The Chapel Island Formation (CIF) at the Burin Peninsula, Newfoundland, Canada, is a 1000+ m-thick siliciclastic succession that hosts the Cambrian GSSP (ca. 541 Ma) 2.4 m above the base of its member 2 (M2) at Fortune Head. In this section, the first appearance of Treptichnus pedum, the index fossil for the base of the Cambrian, but also of other...
The Chapel Island Formation (CIF) of Newfoundland, Canada, is a 1000+ m-thick siliciclastic succession that hosts the Cambrian GSSP (ca. 541 Ma) 2.4 m above the base of its member 2 (M2) in Fortune Head. Although the first appearance of Treptichnus pedum was considered as the marker of the base of the Cambrian, other burrows typical of the Fortunia...
This study documents the distribution of matgrounds in a wide variety of environments recorded in the Ordovician Lashkerak and Ghelli Formations in the Alborz Mountains of northern Iran in order to evaluate controls on their distribution along the marine depositional profile. Detailed facies analysis allowed differentiating three groups of facies a...
The ichnogenera Syringomorpha and Daedalus are here interpreted as products of infaunal biofilm harvesters. This study investigated: (1) Syringomorpha nilssoni and Syringomorpha isp. from the Cambrian Series 2‐Miaolingian Campanario Formation, northwest Argentina; and (2) Daedalus halli from the Floian Grès et Schistes de la Cluse de l'Orb Formatio...
La Formación Mojotoro (Ordovícico Inferior a Medio, Salta, noroeste de Argentina) comprende potentes paquetes de cuarcitas intercaladas con facies heterolíticas, registrando sedimentaci6n en un ambiente litoral a marino somero dominado por mareas. Los ambientes sedimentarios incluyen complejos de ondas de arena submareales, zonas de interbarra, már...
Understanding the functioning of extinct ecosystems is a complicated knot of ecological, evolutionary, and preservational strands that must be untangled. For instance, anatomical and behavioral differences can profoundly alter fossilization pathways. This is particularly true in exceptionally preserved soft-bodied biotas that record the earliest ph...
The Cenomanian Buda Limestone is a widespread coccolith-rich carbonate unit deposited on the Comanche Shelf of the Texas Gulf Coast Basin. This formation is a key stratigraphic marker, and its hydrocarbon resources have been exploited since the 1920s. Despite its stratigraphic and economic importance, the depositional environments, and controls on...
Although the middle Miocene Oficina Formation of the Orinoco Oil Belt represents most of Venezuela's hydrocarbon resource, a comprehensive and detailed sedimentary facies model for the whole belt has never been put forward. Based on the analysis of cores and well logs, nine sedimentary facies (FA-I), forming five facies assemblages (FA1-5), have be...
Benthic animals profoundly influence the cycling and storage of carbon and other elements in marine systems, particularly in coastal sediments. Recent climate change has altered the distribution and abundance of many seafloor taxa and modified the vertical exchange of materials between ocean and sediment layers. Here, we examine how climate change...
