Lower Ordovician microfacies and microfossils from Cerro San Pedro (San Pedro de la Cueva, Sonora, Mexico), as a westernmost outcrop of the newly defined Nuia Province

Vachard, Daniel; Clausen, Sébastien; Palafox, Juan José; Buitrón, Blanca Estela; Devaere, Léa; Hayart, Valentin; Régnier, Sylvie

doi:10.1007/s10347-017-0497-9

Cited by 13 publications

(4 citation statements)

References 106 publications

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“…The high abundance of Nuia sibírica, calcareous algae and fine siliciclastic sediments suggest low energy conditions below wave action within the shallow euphotic zone in the inner platform. Furthermore, the presence of Girvanella intraclasts and Girvanella rafts suggest transport due to wave action and moderate energy conditions (Flügel, 2010;Rong et al, 2014;Vachard et al, 2017;Pandey and Parcha, 2018;Kröger et al, 2019). M2-Peloidal intraclastic packstone-grainstone (Ch5 and Ch6 samples) is composed predominantly of micritic peloids of elongate and irregular shape with a size <1 mm, and subrounded oncoides with thin-cortex (Han et al, 2014).…”

Section: Microfacies Description and Environment Interpretationmentioning

confidence: 99%

“…11). Furthermore, the facies analyzed herein is composed of Nuia sibírica, Girvanella and other calcareous algae which allow interpreting a shallow subtidal environment within the photic zone in a tropical to subtropical climate (Flügel, 2010;Rong et al, 2014;Vachard et al, 2017;Pandey and Parcha, 2018).…”

Section: Paleoenvironment Interpretation Of the Different Types Of Ca...mentioning

confidence: 99%

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Lower Ordovician calcareous microfossils from the San Juan Formation, Argentina: a new type of calcitarch and its paleoenvironmental implications

Moreno

Mestre

Heredia

2023

andgeo

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The calcareous microfossils present in the Ordovician and Silurian carbonate successions around the world are limited to few studies and their biological affinities and environmental preferences remain indefinite. In the carbonate Ordovician San Juan Formation from the Cerro La Chilca section, a group of calcareous microfossils was recognized and, based on their size, they are included in the calcitarch classification. Two types of calcitarchs have been recognized, Type-III calcitarch: large spheres with a thin to medium wall (diameter ~250 μm), and Type-0 calcitarch: small spheres with a thin wall (diameter ~80 μm). The carbonate microfacies analysis of the lower part of the San Juan Formation allowed defining five successive microfacies: burrowed bioclastic wackestone (M1), peloidal intraclastic packstone-grainstone (M2), intraclastic floatstone (M3), intraclastic wackestone-packstone (M4) and bioclastic boundstone (M5). These microfacies are interpreted to range from shallow subtidal facies below wave action to shoal and reef facies. It is possible to infer that the recovered calcitarchs show variations in size in relation to the facies that contain them. The calcitarchs recognized in wackestone-type facies are the Type-0 calcitarch and those recovered from the packstone-grainstone facies are the Type-III calcitarch. The calcitarch sizes variation probably is related to a gradual increase of energy within a shallow subtidal environment. Occurrences of calcitarchs within the Floian Oepikodus evae-O. intermedius conodont zone extends their fossil record into the Early Ordovician.

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Section: Microfacies Description and Environment Interpretationmentioning

confidence: 99%

Section: Paleoenvironment Interpretation Of the Different Types Of Ca...mentioning

confidence: 99%

Lower Ordovician calcareous microfossils from the San Juan Formation, Argentina: a new type of calcitarch and its paleoenvironmental implications

Moreno

Mestre

Heredia

2023

andgeo

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“…herein encompasses the eovolutinins (with two concentric chambers), rauserinins (with clusters of unilocular chambers), and vicinesphaerins (strictly unilocular) (e.g., the genera Eovolutina Antropov, 1950; Rauserina Antropov, 1950; Vicinesphaera Antropov, 1950; Archaesphaera Suleimanov, 1945 [partim]; Serginella Pronina, 1963; Paralagena Sabirov, 1986; and ?Tscherdyncevella Antropov, 1950). They are the most primitive parathuramminids due to the presence, among them, of Vicinesphaera Antropov, 1950 as early as in the Cambrian of Kazakhstan and the Early Ordovician of Mexico (Vachard et al, 2017). The family Eovolutinidae is often confused with the Archaesphaeridae Poyarkov, 1979 auctorum, which could therefore have priority; nevertheless, it is more probable that Archaesphaera Suleimanov, 1945 is a transverse section of Eotuberitina Miklukho-Maklay, 1958, and therefore is a tuberitinoid rather than a parathuramminoid.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…Early Ordovician of Sonora, Mexico (Vachard et al, 2017). Relatively frequent in the Devonian–Tournaisian of western Siberia, Italy, Czech Republic, western France, the northern, central, and southern Urals, and southern Fergana; probably up to the Visean (see Vachard et al, 2014); ?Pennsylvanian of Kansas, ?Permian of Australia.…”

Section: Systematic Paleontologymentioning

confidence: 99%

Middle Devonian parathuramminid and earlandiid foraminifers from shallow marine carbonates of the Carnic Alps (Austria)

Vachard¹,

Krainer²,

Mörtl³

2018

J. Paleontol.

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The Devonian of the Carnic Alps (Austria) is developed in different facies. The shallow marine facies is up to 1200 m thick. The Feldkogel Limestone of the Polinik Formation, >330 m thick, was dated as Eifelian–Late Devonian. The Feldkogel Limestone at Mount Polinik is developed in a peritidal facies composed of subtidal, intertidal, and supratidal deposits. Subtidal sediments are represented by dark gray Amphipora limestone and intertidal deposits by laminated and partly bioturbated grainstone and packstone, ostracode wackestone to packstone, and locally intercalated intraclast breccias documenting tidal channel fills. Laminated microbial mats (stromatolites) formed in a supratidal depositional environment. Grainstone and packstone contain abundant unilocular parathuramminid foraminifers. This latter group encompasses a diversified assemblage of ivanovellids, parathuramminids, uralinellids, and irregularinoids; some earlandiids are also present. They are dated herein as late Eifelian–early Givetian. These foraminifers provide a more precise systematics of these taxa, which often have not been studied for more than half a century. The taxonomic problems of their assignment to foraminifers, pseudo-foraminifers, calcitarcha, thaumatoporellaceans, volvocaleans, or other algae are also discussed. Several taxa are emendated: Parathuramminida, Parathuramminoidea, Irregularinoidea, Eovolutinidae, Ivanovellidae, Parathuramminidae, Uralinellidae, Ivanovella, Elenella, Neoarchaesphaera, Parathurammina, Bykovaella, Uralinella, and Paracaligella. The new taxa are: Ivanovella reitlingerae n. sp., Elenella polinikensis n. sp., Uralinella sabirovi n. sp., and Radiosphaerella poyarkovi n. sp.

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Macroevolution and Biostratigraphy of Paleozoic Foraminifers

Vachard¹

2016

Stratigraphy &Amp; Timescales

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Lower Ordovician microfacies and microfossils from Cerro San Pedro (San Pedro de la Cueva, Sonora, Mexico), as a westernmost outcrop of the newly defined Nuia Province

Cited by 13 publications

References 106 publications

Lower Ordovician calcareous microfossils from the San Juan Formation, Argentina: a new type of calcitarch and its paleoenvironmental implications

Lower Ordovician calcareous microfossils from the San Juan Formation, Argentina: a new type of calcitarch and its paleoenvironmental implications

Middle Devonian parathuramminid and earlandiid foraminifers from shallow marine carbonates of the Carnic Alps (Austria)

Macroevolution and Biostratigraphy of Paleozoic Foraminifers

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