Ordovician reefs of the Ural Mountains, Russia: A review

Антошкина, А. И.

doi:10.1007/bf02536954

Cited by 13 publications

(6 citation statements)

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“…This role was Wlled by algae and microbial mats which triggered a fast synsedimentary lithiWcation and produced wave-resistant reefs (Kerkmann 1967). Similar accumulation patterns have been described by Antoshkina (1996) in Ordovician reefs of the Urals. However, accessory frame encrusting roles involve bryozoans growing upon or within reefal frameworks constructed earlier by other frame-building organisms.…”

Section: Discussion Of the Role Of Bryozoans In Reefssupporting

confidence: 58%

The role of bryozoans in fossil reefs—an example from the Middle Devonian of the Western Sahara

Ernst

Königshof

2008

Facies

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Stenolaemate bryozoans with their stable calcitic skeletons play a signiWcant role in reef building. In the Middle Devonian Sabkhat Lafayrina reef complex (Western Sahara), bryozoans are abundant and diverse. Although they do not form part of the principal framework of reefs, bryozoans are involved signiWcantly in reef growth, especially in the initial stage. In this way, bryozoans are important with respect to initiating reef growth. They contribute greatly to sediment stabilization, making it possible for principal reef builders to grow on hardened and stabilized substrates, and also play sediment-baZing and sedimentWlling roles. The aim of this study is to document the diversity of bryozoans in a Middle Devonian reef complex and to estimate their potential for initiation and contribution to reef structures.

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Section: Discussion Of the Role Of Bryozoans In Reefssupporting

confidence: 58%

The role of bryozoans in fossil reefs—an example from the Middle Devonian of the Western Sahara

Ernst

Königshof

2008

Facies

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“…The earliest known occurrences of Dimorphosiphon are from the basal Upper Ordovician, and they include Dimorphosiphon rectangulare from Norway (Høeg, 1927), Kazakhstan (Gnilovskaya, 1966), Scotland (Elliott, 1972), Ural Mountains of Russia (Antoshkina, 1996), and St. Lawrence Lowlands in Québec, Canada (Guilbault and Mamet, 1976). In addition to D. rectangulare, Gnilovskaya (1966) also identified new species D. diadromum from the roughly coeval strata in Kazakhstan.…”

Section: Surface Paleocurrents and Westward Migration Of Dimorphosiphonmentioning

confidence: 95%

“…Bad'ya Reef, Subpolar (Northern) Ural Mountains, Kozhym River, Northwestern Russia (Uralian Rimmed Shelf).-The basal upper Ashgillian reef-lagoon-sabkha complex of the western slope of subalpine Urals yields a rich microbial association with a diverse algal flora (Antoshkina, 1996). Dolomitized thalli of Dimorphosiphon sp.…”

Section: Balticamentioning

confidence: 99%

Importance of Dimorphosiphon (Chlorophyta, Bryopsidales) for Facies and Paleobiogeographic Studies of the Upper Ordovician Richmondian Red River Formation, Williston Basin

Rendall

Husinec

2012

PALAIOS

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“…During Ordovician time, Baltica's eastern margin faced north and was generally closer to the equator (Cocks & Torsvik, 2005). Extensive barrier-reef complexes developed during late Katian time along these palaeo-northern shelf edges (Antoshkina, 1996, 1998). In earlier compilations such reef complexes were not mentioned from the palaeo-SW epicratonic areas of Baltoscandia.…”

Section: Introductionmentioning

confidence: 99%

Ordovician reef and mound evolution: the Baltoscandian picture

2016

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The widespread growth of reefs formed by a framework of biogenic constructors and framelacking carbonate mounds began on Baltica during Ordovician time. Previously, Ordovician reef and mound development on Baltica was considered to be sporadic and local. A review of all known bioherm localities across the Baltic Basin reveals a more consistent pattern. Ordovician bioherms grew in a wide E-W-aligned belt across the Baltic Basin and occur in several places in Norway. Substantial reef development began simultaneously across the region during the late Sandbian -early Katian interval and climaxed during the late Katian Pirgu age. The current spatiotemporal distribution of bioherms is a result of interdependent factors that involve original drivers of reef development such as relative sea level, climate during the time of deposition and effects of post-depositional erosion. Oceanographic conditions were likely more favourable during times of cooler global climates, low sea level and glacial episodes. At the same time, the likelihood that bioherms are preserved from long-term erosion is higher when deposited during low sea level in deeper parts of the basin. A main factor controlling the timing of the reef and mound evolution was Baltica's shift toward palaeotropical latitudes during Late Ordovician time. The time equivalence between initial reef growth and the Guttenberg isotope carbon excursion (GICE) suggests that global climatic conditions were important.

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Ordovician reefs of the Ural Mountains, Russia: A review

Cited by 13 publications

References 1 publication

The role of bryozoans in fossil reefs—an example from the Middle Devonian of the Western Sahara

The role of bryozoans in fossil reefs—an example from the Middle Devonian of the Western Sahara

Importance of Dimorphosiphon (Chlorophyta, Bryopsidales) for Facies and Paleobiogeographic Studies of the Upper Ordovician Richmondian Red River Formation, Williston Basin

Ordovician reef and mound evolution: the Baltoscandian picture

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