A diverse deep‐marine Ichnofauna from the Eocene Tarcau sandstone of the Eastern Carpathians, Romania

Buatois, Luís A.; Mángano, M. Gabriela; Sylvester, Zoltán

doi:10.1080/10420940109380172

Cited by 37 publications

(15 citation statements)

References 82 publications

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“…Interestingly, the ''shallow-water'' forms are all common constituents of the Skolithos ichnofacies. Numerous authors have demonstrated that this ichnofacies is commonly associated with sandy deep-water fan or channel environments (e.g., Crimes 1977;Frey et al 1990; Buatois and Lopez-Angriman 1992; Buatois et al 2001). It has been recognized that trace-fossil assemblages are influenced principally by depositional conditions and not water depth per se (Crimes 1977;Wetzel 1984;Frey et al 1990).…”

Section: Lithofacies Association 2: Thick-bedded Sandstonementioning

confidence: 98%

Sedimentology, Stratigraphic Architecture, and Ichnology of Gravity-Flow Deposits Partially Ponded in a Growth-Fault-Controlled Slope Minibasin, Tres Pasos Formation (Cretaceous), Southern Chile

Shultz¹,

Hubbard²

2005

Journal of Sedimentary Research

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Section: Lithofacies Association 2: Thick-bedded Sandstonementioning

confidence: 98%

Sedimentology, Stratigraphic Architecture, and Ichnology of Gravity-Flow Deposits Partially Ponded in a Growth-Fault-Controlled Slope Minibasin, Tres Pasos Formation (Cretaceous), Southern Chile

Shultz¹,

Hubbard²

2005

Journal of Sedimentary Research

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“…Desmograpton pamiricus, found in Triassic-Jurassic deposits, has a typical geometry and size (for details, see Uchman, 2003). The specimens reported from the Eocene by Buatois et al (2001) are smaller and more sharply bent up than the Mesoczoic ones and, hence, can be clearly distinguished.…”

Section: Results and Interpretationmentioning

confidence: 95%

“…McCann (1990) tests these observations and finds that the increase in diversity was neither as dramatic nor as consistent during the Phanerozoic as originally suggested. Buatois et al (2001) reviews those works, suggesting that the former reflects global diversification patterns and that the latter provides information about the structure of individual communities. Uchman (2004) provides a detailed evaluation of deep-sea ichnodiversity and suggested a relative maximum during the Early Carboniferous, a marked decrease at the end of the Carboniferous, a minimum during the Permian and Early Triassic, and then a stepwise increase-interrupted by a short decline in the Albian-toward the Eocene maximum, followed by a decline in the Oligocene.…”

Section: Introductionmentioning

confidence: 98%

A Highly Diverse Ichnofauna in Late Triassic Deep-Sea Fan Deposits of Oman

Wetzel¹,

Blechschmidt²,

Uchman³

et al. 2007

PALAIOS

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We encountered a highly diverse ichnofauna within the deep-sea fan deposits of the Upper Triassic Al Ayn Formation in Oman. It comprises 32 ichnogenera: 18 ichnogenera represent predepositional graphoglyptids and other trace fossils that are preserved as casts on turbidite soles, and 14 ichnogenera represent postdepositional trace fossils that penetrate turbidite beds. The relatively large size of the area studied certainly favors encountering a high number of ichnogenera. The diversity we found approximately doubles the value that has often been stated in the literature and contradicts the paradigm that the Triassic represents a time of low ichnodiversity in the deep sea. Although the data are limited, in general the recovery of deepsea tracemakers has been very slow owing to environmental disturbances that resulted from cold-bottom-water circulation after the Carboniferous-Permian glaciation. The high ichnodiversity in the Al Ayn Formation is explained by its paleogeographic position and locally formed warm bottom waters. The Al Ayn deposits accumulated adjacent to wide evaporitic and carbonate shelves, indicating continuous warm conditions. The Al Ayn clastic system was likely influenced by dense, salt-rich, warm water flowing back to the ocean from the carbonate and evaporitic shelf area. The downwelling water may have reduced the effects of cold water that formed during the Late Paleozoic glaciation and the Permian-Triassic anoxia, and, thus, it may have provided a refuge habitat. Despite the global trend of lowdiversity deep-sea ichnocoenoses, refuge habitats may have been established in areas less affected by the otherwise harsh conditions.

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“…By comparison, modern galleries similar to Thalassinoides are produced by thalassinidean shrimps that never abandon their burrows, growing-up inside and enlarging the burrow system, being the most common burrowing organisms of marine intertidal and shallow subtidal environments (Griffis and Suchanek, 1991). Although rare, Thalassinoides is also found in deep marine environments (Sheenan and Schiefelbein, 1984;Uchman, 1995;Buatois et al, 2001). Its facies-crossing character is a consequence of the opportunistic behaviour of a tracemaker able to support episodic or constant environmental changes (Wightman et al, 1987;Pemberton and Wightman, 1992).…”

Section: Discussion Of the Depositional Settingsmentioning

confidence: 99%

“…The ichnofabric is entirely dominated by horizontally-sectioned U-burrows with vertical spreiten, many revealing the curved end of the burrows. Burrow boundaries are invariably sharp-walled, suggesting colonization of firmgrounds (Pemberton and Frey, 1985;Bromley, 1996;Buatois et al, 2001). …”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

First evidence of marine influence in the Cretaceous of the Amazonas Basin, Brazil

Rossetti

Netto

2006

Cretaceous Research

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An integrated investigation emphasizing sedimentological and ichnological studies of Cretaceous deposits of the Alter do Chão Formation, exposed in the western Amazonas Basin, was undertaken with the aim of determining depositional environments. Four facies associations attributed to upper shoreface, foreshore, delta mouth bar, and lower/middle shoreface-prodelta depositional environments are recognized. The upper shoreface deposits were deposited by storm flows. They are interbedded with highly bioturbated sandstones displaying Thalassinoides, Planolites and Diplocraterion traces. The foreshore deposits, which are coarser-grained than the shoreface strata, are characterized by tabular sandstones displaying planar or trough cross-lamination/stratification, wavy/flaser lamination, and parallel lamination. These strata also contain an abundance of trace fossils. The delta mouth bar deposits comprise upward-coarsening beds displaying a lobed geometry. The lower/middle shoreface-prodelta settings consist of well-stratified, very fine-grained sandstones and mudstones deposited mostly by storm action. A wavedominated delta system that prograded into a marine-influenced basin is supported for the study area. Therefore, in contrast to previous interpretations, it seems that a widespread Cretaceous transgression resulted in the submergence of large continental areas in the north of Brazil, affecting sediment deposition even in the innermost portions of the intracratonic Amazonas Basin.

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A diverse deep‐marine Ichnofauna from the Eocene Tarcau sandstone of the Eastern Carpathians, Romania

Cited by 37 publications

References 82 publications

Sedimentology, Stratigraphic Architecture, and Ichnology of Gravity-Flow Deposits Partially Ponded in a Growth-Fault-Controlled Slope Minibasin, Tres Pasos Formation (Cretaceous), Southern Chile

Sedimentology, Stratigraphic Architecture, and Ichnology of Gravity-Flow Deposits Partially Ponded in a Growth-Fault-Controlled Slope Minibasin, Tres Pasos Formation (Cretaceous), Southern Chile

A Highly Diverse Ichnofauna in Late Triassic Deep-Sea Fan Deposits of Oman

First evidence of marine influence in the Cretaceous of the Amazonas Basin, Brazil

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