Brachiopods of the redefined family Tritoechiidae from the Ordovician of Kazakhstan and South Urals

Попов, Л. Е.; Vinn, Olev; Nikitina, O. I.

doi:10.1016/s0016-6995(01)80057-7

Cited by 37 publications

(42 citation statements)

References 7 publications

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“…10). In the best-documented Lower Ordovician section along the Agalatas River about 14 km east of Kurdai (former Georgievka) in the south Kendyktyas Range, facing Zhalair-Naiman, there is a continuous succession of siliciclastic and carbonate rocks (Kendyktas, Agalatas and Kurdai formations) deposited in outer to mid shelf environments with no sign of unconformity within the Tremadocian to Floian (Popov and Holmer 1994;Popov et al 2001), so there was no collision and related uplift along the north-eastern margin of North Tien Shan. The occurrence of the olenid trilobite biofacies with Bienvillia (= Agalatus) in the Floian Kurdai Formation (Lissogor 1961) suggests the presence of a sizeable marine basin in ZhalairNiman then.…”

Section: Ordovician Biogeography Set Against Previous Models Of the Kmentioning

confidence: 99%

Late Ordovician palaeogeography and the positions of the Kazakh terranes through analysis of their brachiopod faunas

Popov

Cocks

2017

Acta Geologica Polonica

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ABSTRACT:Popov, L.E. and Cocks, L.R.M. 2017. Late Ordovician palaeogeography and the positions of the Kazakh terranes through analysis of their brachiopod faunas. Acta Geologica Polonica, 67 (3), 323-380. Warszawa.Detailed biogeographical and biofacies analyses of the Late Ordovician brachiopod faunas with 160 genera, grouped into 94 faunas from individual lithotectonic units within the Kazakh Orogen strongly support an archipelago model for that time in that area. The Kazakh island arcs and microcontinents within several separate clusters were located in the tropics on both sides of the Equator. Key units, from which the Late Ordovician faunas are now well known, include the Boshchekul, Chingiz-Tarbagatai, and Chu-Ili terranes. The development of brachiopod biogeography within the nearly ten million year time span of the Late Ordovician from about 458 to 443 Ma (Sandbian, Katian, and Hirnantian), is supported by much new data, including our revised identifications from the Kazakh Orogen and elsewhere. The Kazakh archipelago was west of the Australasian segment of the Gondwana Supercontinent, and relatively near the Tarim, South China and North China continents, apart from the Atashu-Zhamshi Microcontinent, which probably occupied a relatively isolated position on the south-western margin of the archipelago. Distinct faunal signatures indicate that the Kazakh terranes were far away from Baltica and Siberia throughout the Ordovician. Although some earlier terranes had joined each other before the Middle Ordovician, the amalgamation of Kazakh terranes into the single continent of Kazakhstania by the end of the Ordovician is very unlikely. The Late Ordovician brachiopods from the other continents are also compared with the Kazakh faunas and global provincialisation statistically determined.

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Section: Ordovician Biogeography Set Against Previous Models Of the Kmentioning

confidence: 99%

Late Ordovician palaeogeography and the positions of the Kazakh terranes through analysis of their brachiopod faunas

Popov

Cocks

2017

Acta Geologica Polonica

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“…13); however, these ridges are placed entirely at the bottom of the mantle cavity and are not confined to the boundaries of the visceral area (ventral muscle field) as true dental plates in the orthides and the advanced billingsellide Superfamily Polytoechioidea. Consequently the teeth-supporting ridges in some Billingsella cannot be considered as homologous to the dental plates (for further discussion see Nikitin 1956;Popov et al 2001Popov et al , 2011.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…-Darvaretoechia differs from Billingsella in having well developed dental plates, a low, weakly impressed ventral muscle field open anteriorly, short, curved socket ridges, and a low notothyrial platform that is not strongly inclined anteriorly. The presence of true dental plates indicates that Darvaretoechia can be considered as an early representative of the Family Tritoechiidae (for further discussion see Popov et al 2001).…”

Section: Hyrcanostrophia Tuyehensis Sp Novmentioning

confidence: 99%

Cambrian (Furongian) rhynchonelliform brachiopods from the Eastern Alborz Mountains, Iran

Popov¹,

Zadeh²,

Pour³

et al. 2013

Bull. Geosci.

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The Cambrian (Furongian) shallow water carbonates in the Mila Formation in the Tuyeh-Darvar area (eastern Alborz, northern Iran) contain numerous shell beds, entirely composed of disarticulated valves of the billingsellide brachiopods Billingsella? fortis sp. nov. and Hyrcanostrophia tuyehensis gen. et sp. nov. Higher up in the Mila Formation, the shallow water carbonates are replaced by nodular limestones, deposited in an open marine environment, containing Palaeostrophia tecta Nikitin & Popov, 1983 and the early polytoechioid Darvaretoechia prisca gen. et sp. nov. These two different brachiopod assemblages are assigned to the oligotaxic Billingsella and Palaeostrophia associations, respectively. These associations are considered to represent precursors to the brachiopod-dominated benthic assemblages of the Palaeozoic Evolutionary Fauna. The new brachiopod faunas from the Alborz Terrane are closely similar to contemporaneous Furongian faunas from the Australasian sector of Gondwana, in particular, to those from South China and the Kazakhstanian terranes

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“…A pedicle sheath is also present in at least some taxa of the Order Billingsellida, which is considered as the ancestral stock of strophomenates (Williams et al 1996), in particular in the Middle Ordovician Antigonambonites planus, which is interpreted as an advanced billingsellide (Family Polytoechiidae) (Popov et al 2001(Popov et al , 2007. Its ventral umbonal area in juvenile valves has a short pedicle sheath, widening distally, with a diameter of 350-400 m near the umbo and about 750-900 m at its termination (Fig.…”

Section: Pedicle Sheath In Strophomenatesmentioning

confidence: 99%

Pedicle preservation in a Silurian rhynchonelliformean brachiopod from Herefordshire, England: soft-tissue or an artefact of interpretation?

Bassett¹,

Popov²,

Egerquist

2007

Earth and Environmental Science Transactions of the Royal Socie

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The interpretation of pedicle soft tissue preservation in a unique brachiopod specimen of Wenlock (Silurian) age from Herefordshire, western England, is re-assessed. Bethia serraticulma, assigned originally to the Orthida, is more probably a member of the Strophomenida (Plectambonitoidea). The supposed pedicle structure is more plausibly a weakly mineralised pedicle sheath, which is a common morphological and functional development in the early ontogeny of a number of Palaeozoic brachiopod lineages.

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Brachiopods of the redefined family Tritoechiidae from the Ordovician of Kazakhstan and South Urals

Cited by 37 publications

References 7 publications

Late Ordovician palaeogeography and the positions of the Kazakh terranes through analysis of their brachiopod faunas

Late Ordovician palaeogeography and the positions of the Kazakh terranes through analysis of their brachiopod faunas

Cambrian (Furongian) rhynchonelliform brachiopods from the Eastern Alborz Mountains, Iran

Pedicle preservation in a Silurian rhynchonelliformean brachiopod from Herefordshire, England: soft-tissue or an artefact of interpretation?

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