Genesis and environmental significance of Upper Cretaceous shell concentrations from the Cauvery Basin, southern India

Fürsich, Franz T.; Pandey, Dhirendra K.

doi:10.1016/s0031-0182(98)00099-6

Cited by 76 publications

(21 citation statements)

References 14 publications

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“…Hence, this ichnocoenosis is interpreted as having been deposited below the fair-weather wavebase in the upper offshore environment. Nevertheless modification of molluscan detritus exhibited a random orientation of shell fragments; and these features are interpreted as the result of subsequent bioturbation (Fursich and Pandey 1999).…”

Section: Teichichnus Ichnocoenosismentioning

confidence: 97%

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Characteristic Trace Fossils from Shoreface to Offshore Environments of an Oligocene Succession, Northeastern Taiwan

Chen¹

2005

Terr. Atmos. Ocean. Sci.

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ABSTRACT1 Department of Geosciences, National Taiwan University, Taipei, Taiwan, ROC * Corresponding author address: Prof. Wen-Shan Chen, Department of Geosciences, National Taiwan University, Taipei, Taiwan, ROC; E-mail: wenshan@ntu.edu.tw Well-exposed Oligocene strata of the Hsuehshan Range in Taiwan were deposited in the Hsuehshan Trough along the eastern Eurasia continental margin. The Hsuehshan Trough was a restricted epeiric basin confined by a series of horsts. The Oligocene succession records a deepening-upward to shallowing-upward sequence of deltaic deposystems associated with fluvial and shallow marine environments. These environments ranged from wavedominated delta-plain through storm-dominated delta-slope to regressive tidedominated delta-front environments. The fining-upward to coarsening-upward sequence can be divided into five lithofacies and five ichnocoenoses. Ichnocoenoses characterized by Ophiomorpha, Cylindrichnus, Teichichnus, Scolicia, and Zoophycos were defined on the basis of assemblages, degree of bioturbation, diversity, and abundance.The Lower Oligocene deposits exhibit a fining-upward trend and upward increases trend in bioturbation and abundance of deposit-feeding structures. Accompanying these changes is a transition from Ophiomorpha, Cylindrichnus, Teichichnus, Scolicia to Zoophycos ichnocoenoses, which also suggests a transgressive system from delta-plain to prodelta-slope environment. The sequential variation in lithofacies and ichnofossil assemblages coincides with changes in Early Oligocene sea level. The Upper Oligocene deposits show a shallowing-upward succession that suggests an evolution from a storm-dominated prodelta slope to a tide-dominated delta plain. The ichnofossil assemblages show a transition from Scolicia, Teichichnus to Ophiomorpha ichnocoenoses that are suggestive of regressive systems. The sequential trends documented in the Late Oligocene deposits of northeastern Taiwan are not consistent with global sea-level fluc- TAO, Vol. 16, No. 5, December 2005 1098 tuations and therefore, tectonic processes are invoked to have controlled local basin conditions. In general, the sequential variations documented in the Oligocene strata probably were controlled by paleoceanographic conditions that were closely linked to tectonic processes and longer-term, firstorder sea-level fluctuations.

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Section: Teichichnus Ichnocoenosismentioning

confidence: 97%

“…The Cylindrichnus ichnocoenosis, therefore, is interpreted to be constituted by medium-diversity and high-abundance ichnofossil assemblages within an individual bed (Figs. 7,8), which is represented by the Cruziana ichnofacies close to the fair-weather wave base (MacEachern et al 1999;Fursich and Pandey 1999).…”

Section: Cylindrichnus Ichnocoenosismentioning

confidence: 99%

Characteristic Trace Fossils from Shoreface to Offshore Environments of an Oligocene Succession, Northeastern Taiwan

Chen¹

2005

Terr. Atmos. Ocean. Sci.

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“…A aglyaylabel and Karaplnar) differ in lateral distribution, thickness, sedimentological features, packing of shells, diversity of organisms, alignment and taphonomic processes (Figs. 6, 7, 9, 10; Tables 1, 2, 3; see also Fürsich & Pandey 1999).…”

Section: Biostratinomy and Taphonomymentioning

confidence: 99%

“…debris flows, grain flows or turbidity currents; Middleton & Hampton 1973, 1976Flügel 1978Flügel , 2004Lowe 1982 Kawakami & Kawamura 2002;Potter et al 2005;Nichols 2009;SEPM 2014), also termed gravity flows or density currents, will be discussed in respect to resedimentation of sediments and biogenic components. The determination of specific mechanisms in terms of the genesis concerning event bed deposition, storm deposition, shell accumulation and the consequences for the facies and bioclastic fabric were reported and discussed in Aigner (1982aAigner ( , 1985, Einsele & Seilacher (1982), Kreisa & Bambach (1982), Brett & Baird (1986), Kidwell (1986Kidwell ( , 1991aKidwell ( ,b, 1993a, Kidwell et al (1986), Tucker & Wright (1990), Brett & Seilacher (1991), Chuanmao et al (1993), Einsele et al (1991a,b), Seilacher & Aigner (1991), Soja et al (1996), Hips (1998), Fürsich & Pandey (1999), Martin (1999), Storms (2001), Lukeneder (2003aLukeneder ( ,b, 2004a, Fernández-López (2007), Montiel-Boehringer et al (2011), andPérez-Lopéz &Pérez-Valera (2012). The result is a detailed succession of abundance or accumulation layers (i.e.…”

Section: Introductionmentioning

confidence: 99%

Taphonomic implications from Upper Triassic mass flow deposits: 2-dimensional reconstructions of an ammonoid mass occurrence (Carnian, Taurus Mountains, Turkey)

Mayrhofer¹

2014

Geologica Carpathica

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Ammonoid mass occurrences of Late Triassic age were investigated in sections from A şağlyaylabel and Yukarlyaylabel, which are located in the Taurus Platform-Units of eastern Turkey. The cephalopod beds are almost monospecific, with > 99.9 % of individuals from the ceratitic genus Kasimlarceltites, which comprises more than hundreds of millions of ammonoid specimens. The ontogenetic composition of the event fauna varies from bed to bed, suggesting that these redeposited shell-rich sediments had different source areas. The geographical extent of the mass occurrence can be traced over large areas up to 10 km2. Each of the Early Carnian (Julian 2) ammonoid mass occurrences signifies a single storm (e.g. storm-wave action) or tectonic event (e.g. earthquake) that caused gravity flows and turbidity currents. Three types of ammonoid accumulation deposits are distinguished by their genesis: 1) matrix-supported floatstones, produced by low density debris flows, 2) mixed floatstones and packstones formed by high density debris flows, and 3) densely ammonoid shell-supported packstones which result from turbidity currents. Two-dimensional calculations on the mass occurrences, based on sectioning, reveal aligned ammonoid shells, implying transport in a diluted sediment. The ammonoid shells are predominantely redeposited, preserved as mixed autochthonous/parautochnonous/ allochthonous communities based on biogenic and sedimentological concentration mechanisms ( = in-situ or post-mortem deposited). This taphonomic evaluation of the Kasimlarceltites beds thus reveals new insights into the environment of deposition of the Carnian section, namely that it had a proximal position along a carbonate platform edge that was influenced by a nearby shallow water regime. The Kasimlarceltites-abundance zone is a marker-zone in the study area, developed during the drowning of a shallow water platform, which can be traceable over long distances.

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“…6 , 1990;Kitamura et al, 1994; Naish and Kamp, 1997;Kondo et al, 1998;, 1999 Kidwell, 1991aKidwell, , c, 1993aBrett, 1995Brett, , 1998Abbott, 1997;Abbott and Carter, 1997;Brett et al, 1997; Naish and Kamp, 1997;Kamp and McIntyer, 1998;, 1996, 1998Kondo, 1997;Kondo et al, 1998Fürsich, 1978Kidwell, 1986;Fürsich and Aberhan, 1990;Kidwell, 1991a-c;Kidwell and Bosence, 1991;Norris, 1986;Fürsich and Pandey, 1999;Fürsich and Oschmann, 1986, 1999 , 110 12 739 Coin is 22 mm in diameter. B: P. waitemata partly filled with fragmented tests of barnacles derived from the overlying coquina bed white C .…”

Section: N1mentioning

confidence: 99%

Paleontologic and ichnologic interpretation for a peculiar mode of occurrence of shell concentrations in the lower part of the Tatamigaura Sandstone Member of the Middle Miocene Tougane Formation, Hamada, western part of Shimane, Japan

Kotake

Kondo

Fujii

et al. 2004

Jour. Geol. Soc. Japan

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A production mechanism and process of the dish-and lens-shaped shell concentrations observed in the lower part of Tatamigaura Sandstone Member of the Middle Miocene Tougane Formation distributed in the northeastern part of Hamada City, Shimane, Japan were examined from the ichnologic and paleontologic viewpoints. The dish-and lens-shaped shell concentrations treated herein are visible on the bedding plane as the circular patches having cm to cm in diameter. In cross section, on the other hand, they are observed as an isolated, concave-up crescent or lens, of which thickness ranges from cm to cm. These shell concentrations consist mainly of graded, disarticulated bivalves, most of which show convex-down orientation, with less number of gastropods.In addition to these shell-concentrations, well-preserved specimens of pothole-like trace fossil Piscichnus waitemata, which is interpreted to be the products of feeding behavior of rays, occur below the shell concentrations-bearing interval. The Tatamigaura P. waitemata occurring in fine-grained sandstone can be seen an isolated structure filled with graded, fragmented barnacles derived from the overlying coquina bed and less number of shells of host sediment origin. Morphology, size, and internal fabric of lower part of the Piscichnus are closely similar to those of the dish-and lens-shaped shell concentrations. These lines of evidence strongly suggest that the dish-and lens-shaped shell concentrations appear to have formed by biogenic currents by the feeding behavior of rays. Invisibility of the whole morphology of P. waitemata associated with dish-or lens-shaped shell concentrations is due to extremely low contrast in grain size between the fill and the host sediment and selective obliteration of the morphologic record at the middle to upper parts of P. waitemata in terms of overprinting by the younger one and/or subsequently occurred. AbstractCThe Geological Society of Japan 2004 733

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Genesis and environmental significance of Upper Cretaceous shell concentrations from the Cauvery Basin, southern India

Cited by 76 publications

References 14 publications

Characteristic Trace Fossils from Shoreface to Offshore Environments of an Oligocene Succession, Northeastern Taiwan

Characteristic Trace Fossils from Shoreface to Offshore Environments of an Oligocene Succession, Northeastern Taiwan

Taphonomic implications from Upper Triassic mass flow deposits: 2-dimensional reconstructions of an ammonoid mass occurrence (Carnian, Taurus Mountains, Turkey)

Paleontologic and ichnologic interpretation for a peculiar mode of occurrence of shell concentrations in the lower part of the Tatamigaura Sandstone Member of the Middle Miocene Tougane Formation, Hamada, western part of Shimane, Japan

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