Notes on the Anisian biostratigraphy of the Gebze Area (Kocaeli Peninsula, Turkey)1)

Assereto, R.

doi:10.1127/zdgg/123/1972/435

Cited by 12 publications

(3 citation statements)

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“…The palaeontological data indicate an Anisian to Carnian age for the Kayabaşı Formation. In terms of facies and age, it can be compared with the Triassic sequence in Dobrugea (Seghedi, 2001) and to a lesser degree with the Triassic in the western part of the Istanbul Zone (Yurttaş-Özdemir, 1971; Assereto, 1972); however, the conodont fauna in the Istanbul–Gebze region is quite different (Gedik, 1975; A. M. Kılıç, unpub. Ph.D. thesis, Cumhuriyet Univ., 2004).…”

Section: The Küre Complexmentioning

confidence: 99%

Triassic limestone, turbidites and serpentinite–the Cimmeride orogeny in the Central Pontides

2014

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The basement of the Central Pontides, and by implication that of Crimea, consists of pre-Permian low-grade metaclastic rocks intruded by latest Permian – Early Carboniferous (305–290 Ma) granitoids. Further up in the stratigraphic sequence are Triassic limestones, which are now preserved as olistoliths in the deformed Upper Triassic turbidites. New conodont and foraminifera data indicate an Anisian to Carnian (Middle to Late Triassic) age for these hemi-pelagic Hallstatt-type limestones. The siliciclastic turbidites surrounding the Triassic limestone contain the Norian (Late Triassic) bivalve Monotis salinaria; the same species is also found in the Tauric series in Crimea. The Upper Triassic flysch in the Central Pontides is locally underlain by basaltic pillow lavas and includes kilometre-size tectonic slices of serpentinite. Both the flysch and the serpentinite are cut by an undeformed acidic intrusion with an Ar–Ar biotite age of 162 ± 4 Ma (Callovian–Oxfordian). This indicates that the serpentinite was emplaced into the turbidites before Middle Jurassic time, most probably during latest Triassic or Early Jurassic time, and that the deformation of the Triassic sequence pre-dates the Middle Jurassic. Regional geological data from the circum-Black Sea region, including widespread Upper Triassic flysch, Upper Triassic eclogites and blueschists of oceanic crustal affinity, and apparent absence of a ‘Cimmerian continent’ between the Cretaceous and Triassic accretionary complexes indicate that the latest Triassic Cimmeride orogeny was accretionary rather than collisional and is probably related to the collision and accretion of an oceanic plateau to the southern active margin of Laurasia.

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Section: The Küre Complexmentioning

confidence: 99%

Triassic limestone, turbidites and serpentinite–the Cimmeride orogeny in the Central Pontides

2014

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“…southwards, opening the Western Black Sea basin during the Cretaceous (e.g., Okay et al 1994Okay et al , 2018Okay & Tüysüz 1999;Okay & Görür 2007;Tari et al 2015;Tüysüz 2018). The Triassic succesion of the Istanbul Terrane/Zone, as described by Yurttaş-Özdemir (1971), Assereto (1972), Fantini Sestini (1988), and Gaetani (2016), has no counterpart, neither by its lithology nor by its ammonoid and brachiopod faunas, in the Triassic successions of any of the geological units supposedly underlying the 'Odessa Shelf', i.e., in the Triassic successions of the Scythian and Moesian platforms and particularly in the Triassic successions of the North Dobrogean Orogen. Moreover, the Triassic successions drilled in the Histria Depression, located in the Romanian Western Black Sea shelf in the eastward offshore prolongation of the North Dobrogean Orogen (Grădinaru et al 1989;Cătuneanu & Maftei 1994), are not to be found in the Istanbul Terrane/Zone.…”

Section: Geological Settingmentioning

confidence: 99%

Rhaetian (Late Triassic) ostracods (Crustacea, Ostracoda) from the offshore prolongation of the North Dobrogean Orogen into the Romanian Black Sea shelf

Forel

Grădinaru

2020

EJT

473

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The present study evaluates the significance of Triassic ostracods from the Romanian Black Sea shelf as part of a project for the understanding of the palaeoceanographical evolution of the offshore extension of the North Dobrogean Orogen. The drill core CM31, sampled from the borehole 817 Lebăda Vest drilled on the western Romanian portion of the Black Sea shelf, contains sediments of Rhaetian, Late Triassic age. The taxonomy of ostracods obtained is discussed and adds to the scientific understanding of marine ostracods during the Rhaetian stage. We document 72 species, of which seven are new: Histriabairdia pontuseuxinusensis Forel gen. et sp. nov., Bairdiacypris argonautaii Forel sp. nov., Ceratobairdia? akhilleusi Forel sp. nov., Isobythocypris atalantella Forel sp. nov., Petasobairdia amazonella Forel sp. nov., Paracypris ovidi Forel sp. nov. and Pseudomacrocypris? kerabani Forel sp. nov. Histriabairdia Forel gen. nov. is introduced to accommodate species of the Triassic–Jurassic interval previously attributed to the modern genus Anchistrocheles. These assemblages point to an outer shelf environmental with relatively normal marine oxygenation. The oldest occurrence of Pokornyopsis, found in this material, indicates that this forerunner of modern troglobitic ostracods may not have been troglobitic in the Triassic.

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“…However, according to (Konstantinov, 1991а;p. 42), "the adoption of the genus Nicomedites as an ancestor for the boreal genera Gymnotoceras and Frechites, which is mainly known from Tethyan realms, in particular, Asia Minor (Assereto, 1972(Assereto, , 1974Toula, 1896), is poorly justified". Bucher (1988) considered the genus Eogymnotoceras, widespread in Beds with Augastaceras escheri and Beds with Platycuccoceras praebalatonensis of the Nevadisculites taylori Zone, as well as in the lower part of the Balatonites shoshonensis Zone of Nevada as an ancestor of the genus Gymnotoceras.…”

Section: The System and Phylogeny Of Beyrichitidaementioning

confidence: 99%

On the System and Phylogeny of the Beyrichitidae (Ammonoidea, Middle Triassic)

Константинов

2021

Paleontol. J.

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The history of the establishment of the family Beyrichitidae (Ammonoidea) and the opinions of various authors on its systematics are discussed. The morphological characteristics, composition, and distribution of beyrichitids are discussed; the family status of this group of Middle Triassic ammonoids is substantiated. A phylogenetic analysis of the ammonoids of the family Beyrichitidae is carried out, and two lineages in the evolution of the Boreal Late Anisian beyrichitids, recognized based on study of morphogenesis of the main structures of shells and analysis of chrono-and geochorological data are considered. A new subfamily Frechitinae subfam. nov. is established within Beyrichitidae.

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Notes on the Anisian biostratigraphy of the Gebze Area (Kocaeli Peninsula, Turkey)1)

Cited by 12 publications

References 0 publications

Triassic limestone, turbidites and serpentinite–the Cimmeride orogeny in the Central Pontides

Triassic limestone, turbidites and serpentinite–the Cimmeride orogeny in the Central Pontides

Rhaetian (Late Triassic) ostracods (Crustacea, Ostracoda) from the offshore prolongation of the North Dobrogean Orogen into the Romanian Black Sea shelf

On the System and Phylogeny of the Beyrichitidae (Ammonoidea, Middle Triassic)

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