Ichnology of deep‐sea fan overbank deposits of the Ganei slates (Eocene, Switzerland)— a classical flysch trace fossil locality studied first by Oswald Heer

Wetzel, Andreas; Uchman, Alfred

doi:10.1080/10420949709386413

Cited by 38 publications

(18 citation statements)

References 49 publications

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“…The Bone Bed is overlain by strata containing Thalassinoides, indicating better water oxygenation. However, it should be noted that, in contrast to the makers of Thalassinoides and Rhizocorallium, the Planolites producers have no direct access to sea water and use oxygen from the deposit (Wetzel and Uchman 1997, 1998a, 2001Głuszek 1998;Uchman 2004). Thus the environment with Planolites makers was not necessarily completely anoxic.…”

Section: Thalassinoides Ichnoassociation (Ia 3)mentioning

confidence: 99%

Trace fossils from the Lower Muschelkalk of Raciborowice Górne (North Sudetic Synclinorium, SW Poland) and their palaeoenvironmental interpretation

Chrząstek¹

2013

Acta Geologica Polonica

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The following trace fossils have been recognised in the Lower Muschelkalk of Raciborowice Gorne (North Sudetic Synclinorium, SW Poland): Archaeonassa fossulata, Balanoglossites triadicus, ?Gastrochaenolites isp., Lockeia isp., Palaeophycus tubularis, Palaeophycus isp., ?Planolites beverleyensis, P. montanus, Planolites isp., ?Protovirgularia isp., Rhizocorallium commune var. auriforme, R. commune var. irregulare, R. jenense, Skolithos linearis, Thalassinoides suevicus and Trypanites weisei. Coprolites and an unidentified trace fossil A are also described. The trace fossils allow the discrimination of five ichnoassociations in the Raciborowice Gorne section: (IA 1) Rhizocorallium- Pholeus, (IA 2) Rhizocorallium-Palaeophycus, (IA 3) Thalassinoides, (IA 4) Trypanites-Balanoglossites and (IA 5) Planolites-Palaeophycus. The Lower Muschelkalk succession was deposited on a shallow carbonate ramp affected by frequent storms. Deposition commenced with sedimentation in a restricted lagoon on the inner ramp with a short episode of sabkha formation. It continued on the middle and outer ramp and then on a skeletal shoal of the outer ramp and in an open basin. Ichnoassociation IA 5 is related to a maximum transgression that commenced with the deposition of the Spiriferina Bed and which probably marked the opening of the Silesian-Moravian Gate. The basin underwent two shallowing episodes, as evidenced by ichnoassociations IA 3-IA 4, resulting in the formation of hardgrounds. Bathymetric changes in the Raciborowice Gorne section correspond well with a general transgressive trend in the Germanic Basin.

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Section: Thalassinoides Ichnoassociation (Ia 3)mentioning

confidence: 99%

Trace fossils from the Lower Muschelkalk of Raciborowice Górne (North Sudetic Synclinorium, SW Poland) and their palaeoenvironmental interpretation

Chrząstek¹

2013

Acta Geologica Polonica

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“…Spirocosmorhaphe sigmoidalis (Heer, 1877), as redescribed and figured by Wetzel and Uchman (1997) from the Eocene flysch sediments of Switzerland, is a large species compared to our specimens and is characterized by its omega-shaped meanders, unlike the sigmoidal or S-shaped meanders in our species.…”

Section: Remarksmentioning

confidence: 82%

Middle Jurassic trace fossils from the Ridang Formation in Sajia County, South Tibet, and their palaeoenvironmental significance

Zhang

Shi

Gong

2007

Facies

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An ichnofauna consisting of 18 ichnospecies (one of them new) in 14 ichnogenera are described for the first time from the Middle Jurassic Ridang Formation in Sajia County, South Tibet. The ichnofauna can be subdivided into two ichnoassemblages in ascending stratigraphic order: the Palaeophycus-Megagrapton ichnoassemblage in the lower and middle parts of the Ridang Formation, followed by the Cosmorhaphe-Nereites-Paleodictyon ichnoassemblage in the upper Ridang Formation. Overall, the trace fossils occur in a middle-distal turbidite fan sequence, as evidenced by both sedimentological analysis and the composition of the trace fossils. Several subenvironments of the middle-distal fan system have been recognized on the basis of the spatial distribution of the trace fossils. Typically, the channel-fill deposits in the middle part of the turbidite fan lack trace fossils, the interchannel and upper channel-fill (levee) subenvironments of the middle turbidite fan contain abundant faciescrossing trace fossils, in contrast to the distal part of the turbidite fan where deep-water trace fossils are dominant. The ichnofauna is similar to typical flysch ichnofaunas from Europe and North America in characteristics, and is interpreted to represent a typical deep-sea Nereites ichnofacies. The presence of these deep-sea trace fossils therefore would suggest that a continental slope environment existed in southern Tibet during the Middle Jurassic and the study area was located in a slope-abyssal plain setting.

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“…Above this, the appearance of Neonereites, Megagrapton and Nereites seems to point to an increase in depth. These ichnogenera, often noted in the Nereites ichnofacies [Tunis and Uchman, 1996;Wetzel and Uchman, 1997;Uchman, 1995], are generally characteristic of significant bathymetry. This hypothesis is supported by the nature of the detritic material: finer and containing parallel laminae.…”

Section: Discussionmentioning

confidence: 99%

Ichnology and sedimentology of the “Argiles de Saïda” formation (Callovo-Oxfordian) of the Djebel Brame (Tiaret, Algeria)

Bendella

Benyoucef

Cherif

et al. 2011

Bulletin De La Société Géologique De France

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The focus of this note is an ichnological study of the "Argiles de Saïda" formation (Callovo-Oxfordian) in the Djebel Brame, a region representing the eastern extremity of the Tlemcenian domain and marked by rhythmic clay-sandstone sedimentation. From a lithostratigraphic viewpoint, the formation is composed of two units with a distinct sequential organization and trace fossil content. These deposits are characterized by weak to moderate bioturbation, eleven ichnogenera were found: Bergaueria, Chondrites, Diplichnites, Megagrapton, Neonereites, Nereites, Ophiomorpha, Palaeophycus, Rhizocorallium, Taenidium and Thalassinoides. The basal unit is mainly characterized by fine sediments organized into small turbiditic sequences. Most of the beds are around one centimeter thick except for the conglomerate layer, channelized by the debris flow. This layer is heterometric and polygenic.The soles of the beds are generally marked by flute and groove casts, proof of their erosion by the currents. Most of these siliciclastic beds are organized around a repetitive model, with a massive base and flat, parallel and/or wavy laminae at the summit. Occasionally there are also beds of complex ripple marks, fluid escape structures and convoluted laminae. This sedimentation was deposited in an offshore environment, below the storm action influence threshold.Most of ichnogenera are associated with episodic silica-clastic deposits. The disappearance of Bergaueria and Diplichnites ichnogenera corresponds to the period when the basal conglomerate layer was established, and constituted stressful conditions for the organisms responsible for the two traces. Conversely, above this level, the appearance of Taenidium and Thalassinoides seems to correspond to a colonization by opportunistic endobenthic organisms.The weak hydrodynamism of the depositional environment, as well as the associated trace fossils content, point to the distal part of the Cruziana ichnofacies.The other, coarser, unit is an alternation of greenish clays, carbonate rocks and occasionally slumped sandstone. It is dominated by storm sequences. The more proximal summit shows shoreface deposits marked by phases of emersion. As well as episodes of storms and oolitic deposition, there are, at the top of this unit, deposits from a reefal environment ("Subreefal Layer"). These are indicative of shallow depths. Observable trace fossil content points to the most proximal part of the Cruziana ichnofacies. The trace fossil distribution and sedimentology both reveal hitherto undisclosed bathymetric fluctuations. A major fluctuation, most likely due to tectonic instability, was recorded before the second sequence was established. These results call for the biostratigraphic and structural study of the "Argiles de Saïda" formation in the Tlemcenian domain. Ichnologie et sédimentologie de la formation des "Argiles de Saïda" (Callovo-Oxfordien) du Djebel Brame (Tiaret, Algérie)Mots-clés. -Argiles de Saïda, Callovo-Oxfordien, Algérie, Turbidites, IchnofacièsRésumé. -L'objectif de cet art...

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Ichnology of deep‐sea fan overbank deposits of the Ganei slates (Eocene, Switzerland)— a classical flysch trace fossil locality studied first by Oswald Heer

Cited by 38 publications

References 49 publications

Trace fossils from the Lower Muschelkalk of Raciborowice Górne (North Sudetic Synclinorium, SW Poland) and their palaeoenvironmental interpretation

Trace fossils from the Lower Muschelkalk of Raciborowice Górne (North Sudetic Synclinorium, SW Poland) and their palaeoenvironmental interpretation

Middle Jurassic trace fossils from the Ridang Formation in Sajia County, South Tibet, and their palaeoenvironmental significance

Ichnology and sedimentology of the “Argiles de Saïda” formation (Callovo-Oxfordian) of the Djebel Brame (Tiaret, Algeria)

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