Early Ordovician (Arenig) faunal assemblages from western Argentina: biodiversification trends in different geodynamic and palaeogeographic settings

Waisfeld, Beatriz G.; Sánchez, Teresa M.; Benedetto, Juan L.; Carrera, Marcelo G.

doi:10.1016/s0031-0182(03)00464-4

Cited by 42 publications

(33 citation statements)

References 58 publications

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“…Competition Increasing need for space generates narrower niches, burrowing and tiering and expansion into new habitats Waisfeld et al, 2003;Servais et al, 2008 Plankton revolution Marked increase in phytoplankton and zooplankton fuelled diversifications at all levels in the food chain Servais et al, 2008Servais et al, , 2009Servais et al, , 2010 Predation Diversification of predators ignited GOBE arms race, increased burrowing, mobility and skeletal protection Servais et al, 2010Servais et al, 2006Servais et al, , 2013. Such studies convincingly highlight the importance of regional studies as the building blocks of any global datasets and the individuality of both clades and continents.…”

Section: Intrinsic Driving Factors Mechanism Referencesmentioning

confidence: 99%

The Great Ordovician Biodiversification Event: Reviewing two decades of research on diversity's big bang illustrated by mainly brachiopod data

2015

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Section: Intrinsic Driving Factors Mechanism Referencesmentioning

confidence: 99%

The Great Ordovician Biodiversification Event: Reviewing two decades of research on diversity's big bang illustrated by mainly brachiopod data

2015

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“…The development of lithistid sponges with different growth forms within this type of reef may have been related to subtle changes in the habitat, such as changes in water currents or sedimentation, rather than to differences in the mode of reef construction. Waisfeld et al (1993) considered that Early Ordovician discoid, domal, or laminar sponges with central cavities were unable to live in environments with moderate to high rates of sedimentation. The occurrence of abundant platy lithistid sponges in the present study section may suggest a low rate of sedimentation.…”

Section: Lithistid Sponge-calcimicrobial Reefsmentioning

confidence: 99%

Early Ordovician reefs in South China (Chenjiahe section, Hubei Province): deciphering the early evolution of skeletal-dominated reefs

Adachi¹

2012

Facies

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The Lower Ordovician (late Tremadocianearly Floian) Fenhsiang and the overlying Hunghuayuan Formations at the Chenjiahe section in the Three Gorges area of Hubei Province, South China, include four types of reef: microbe-dominated (lithistid sponge-stromatolite and lithistid sponge-calcimicrobial) reefs, and skeletal-dominated (lithistid sponge-bryozoan and bryozoan-pelmatozoan) reefs. The microbe-dominated reefs are characterized by the dominance of microbial sediments that encrusted and bound the surfaces of sponges to reinforce the reef frameworks. In contrast, the skeletal-dominated reefs are distinguished by bryozoans that encrusted frame-building sponges and pelmatozoans, and that grew downward to fill the open spaces available within the frameworks. A series of these reefs shows a temporal succession in reef type, with a decline in the lithistid sponge-stromatolite reefs and an increase in the lithistid sponges and receptaculitids within the lithistid sponge-calcimicrobial reefs in the Hunghuayuan Formation; the lithistid sponge-bryozoan reefs are common in both the Fenhsiang and HunghuayuanFormations. These features of the Chenjiahe reefs are in marked contrast to other coeval reefs on the Yangtze Platform and elsewhere. Skeletal-dominated reefs first developed in the Three Gorges and adjacent areas, located on the central part of the platform. Likewise, lithistid sponges and receptaculitids first developed in the Three Gorges area and then expanded their range. In contrast, stromatolites declined over time, but remained abundant on a marginal part of the platform. The spatial-temporal distributions of these reefs on the Yangtze Platform reflect the initiation of the Great Ordovician Biodiversification Event and its consequences, although influenced by local environmental conditions. The Three Gorges area was a center for the development of skeletal-dominated reefs, which were established earlier here than elsewhere in the world. These reef types and their spatial-temporal successions provide invaluable clues to the earliest evolution of skeletal-dominated reefs and their ensuing development during the Middle-Late Ordovician.

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“…The orthids listed in this association are dominantly attached forms and can be related to guild G1 of Waisfeld et al . (2003) (low attached, umbo down, ventribiconvex, subrectangular or semielliptical) with very few specimens belonging to guild G5 (low attached, probably interstitial; Skenidiids) and to guild G8 (ambitopic; syntrophopsidae).…”

Section: The Brachiopod Faunamentioning

confidence: 83%

“…Waisfeld et al . (2003) investigated the general distribution of rhynchonelliformean brachiopods from three different Early to Middle Ordovician basins, namely the Cordillera Oriental, Famatina and Precordillera basins located at subtropical to temperate latitudes.…”

Section: Discussionmentioning

confidence: 99%

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Brachiopod associations from the Middle Ordovician of the Oslo Region, Norway

Candela

Hansen

2010

Palaeontology

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The marine upper Darriwilian (Middle Ordovician) Elnes Formation of southern Norway contains very rich and diverse invertebrate faunas. Stratigraphically detailed recent collections of these well-preserved faunas have permitted a more thorough description of the various faunal groups and their preferences in the late Middle Ordovician of the Oslo Region, southern Norway, than ever before. The brachiopod faunas are described in the present article, which include a new genus and a new species respectively Wandaasella modheimrensis and Cyclomyonia vikersundi. The brachiopod fauna is largely dominated by linguliformeans although some sections of the formation are dominated by the plectambonitoids Alwynella ildjernensis Spjeldnaes or Cathrynia aequistriata (Hadding) or by orthid brachiopods. Statistical analysis of the brachiopod fauna reveals that the general depositional trend of the Elnes Formation is that of a regressive event from the lower part of the Sjøstrand Member to the Håkavik Member. Three main brachiopod associations are recognised: a deep-water, lingulid dominated association associated with quiet and dysoxic bottom conditions, a sowerbyellid dominated association (e.g. Cathrynia and Alwynella) found in muddy to marly deposits formed around maximal storm wave base and an orthid-dominated association representing an environment characterised by a fairly coarse or hard bottom substrate formed well above storm wave base but below fair weather wave base.

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Early Ordovician (Arenig) faunal assemblages from western Argentina: biodiversification trends in different geodynamic and palaeogeographic settings

Cited by 42 publications

References 58 publications

The Great Ordovician Biodiversification Event: Reviewing two decades of research on diversity's big bang illustrated by mainly brachiopod data

The Great Ordovician Biodiversification Event: Reviewing two decades of research on diversity's big bang illustrated by mainly brachiopod data

Early Ordovician reefs in South China (Chenjiahe section, Hubei Province): deciphering the early evolution of skeletal-dominated reefs

Brachiopod associations from the Middle Ordovician of the Oslo Region, Norway

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