The Pattern of Global Bio-Events During the Ordovician Period

Barnes, Christopher R.; Fortey, Richard A.; Williams, S. Henry

doi:10.1007/978-3-642-79634-0_9

Cited by 40 publications

(28 citation statements)

References 88 publications

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“…While the "Cambrian explosion" involved the origins of skeletalization and a range of new body plans, the Ordovician biodiversification generated few new higher taxa but witnessed a staggering increase in disparity and biodiversity (e.g., Harper, 2006). Barnes et al (1995) reviewed the global bio-events during the Ordovician, and two international research projects have since targeted the Ordovician biodiversification. International Geoscience Programme (IGCP) Project 410, "The Great Ordovician Biodiversification Event" (1997, resulted in a compilation of biodiversity curves for all fossil groups of the Ordovician biota (Webby et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Understanding the Great Ordovician Biodiversification Event (GOBE): Influences of paleogeography, paleoclimate, or paleoecology

Servais¹,

Harper²,

Munnecke³

et al. 2009

Gsa Today

142

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ABSTRACT"The Great Ordovician Biodiversification Event" (GOBE) was arguably the most important and sustained increase of marine biodiversity in Earth's history. During a short time span of 25 Ma, an "explosion" of diversity at the order, family, genus, and species level occurred. The combined effects of several geological and biological processes helped generate the GOBE. The peak of the GOBE correlates with unique paleogeography, featuring the greatest continental dispersal of the Paleozoic. Rapid sea-floor spreading during this time coincided with warm climates, high sea levels, and the largest tropical shelf area of the Phanerozoic. In addition, important ecological evolutionary changes took place, with the "explosion" of both zooplankton and suspension feeding organisms, possibly based on increased phytoplankton availability and high nutrient input to the oceans driven by intense volcanic activity. Extraterrestrial causes, in the form of asteroid impacts, have also been invoked to explain this remarkable event.

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Section: Introductionmentioning

confidence: 99%

Understanding the Great Ordovician Biodiversification Event (GOBE): Influences of paleogeography, paleoclimate, or paleoecology

Servais¹,

Harper²,

Munnecke³

et al. 2009

Gsa Today

142

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“…Initial studies of Ordovician graptolite diversity were based on global data (Sepkoski 1995(Sepkoski , 1999Barnes et al 1996). But in recent years, more case studies of the regional diversity histories within the overall global biodiversification event have been published (e.g.…”

Section: Comparison With Regions Outside Chinamentioning

confidence: 99%

Diversification patterns of Early and Mid Ordovician graptolites in South China

2007

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During the Early and Mid Ordovician, graptoloids underwent a dramatic diversification. Many clades (e.g. anisograptids, dichograptids and biserials) originated and subsequently diversified during this interval, playing the most important roles in the evolution history of graptolites. In this study we conduct an analysis of the generic and species diversity history of Early to Mid Ordovician graptolites from the Yangtze Region (platform) and Jiangnan Region (slope) of South China, and provide evidence that the regionally distinct biodiversification patterns are related to the different representative environments of each region.Graptolite diversity measured across graptolite zones displays a remarkable increase in both regions during the Early to Mid Ordovician, but with distinct scales and patterns in each region. In the Upper Yangtze Region, the diversification is less rapid and can be divided into four phases. The second major diversification phase (early Arenig) is characterized by the rapid expansion of dichograptids, and the fourth diversification phase (mid‐late Darriwilian), which is preceded by a decline (third phase), is typified by the flourishing of biserial graptolites. The diversification of graptolites in the Jiangnan Region is more dramatic and shows a distinct pattern of rapid, progressive and sustained diversity rise from the early Arenig to the early Darriwilian. This rapid diversification is initially driven by the expansion of dichograptids and subsequently enhanced by the significant addition of glossograptids and diplograptids.A comparison of diversity patterns between the Upper Yangtze Region, the Jiangnan Region, Australasia, Baltoscandia and Avalonia indicates: (1) the global Arenig expansion of dichograptids is also recorded in South China, (2) the diversity pattern of the Upper Yangtze Region is largely comparable to that of Baltoscandia and Avalonia, but is considerably different from that of Australasia, and (3) the sustained rapid increase of graptolite diversity in the Jiangnan Region is not shared by any of the other regions. Copyright © 2007 John Wiley & Sons, Ltd.

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“…If there was any record of the trap style volcanism expected from a superplume, it would have long been eroded or obscured by deposition of younger strata and most of the evidence from the Ordovician sea floor would have long since been subducted into the mantle (Barnes et al 1996), other than perhaps a few obducted slabs of Ordovician marine sediments.…”

Section: Qing Et Al (1998) Noted Decreasing Strontium Isotope Valuesmentioning

confidence: 99%

Evolution of the Late Ordovician plaesiomyid brachiopod lineage in Laurentia

Sproat

Jin

2013

Can. J. Earth Sci.

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During the Late Ordovician, a transgression flooded much of Laurentia. The fauna of these intracratonic basins became differentiated from the fauna of the pericratonic shelves and platforms, typically displaying gigantism and coarser shell ornamentation. In this study, 509 specimens from 11 species of the Plaesiomyidae brachiopod family from the Katian and Hirnantian were measured, of which 198 included in principal component analysis to quantify morphological changes over this interval. Three trends were revealed: 1) increasing globosity and dorsal convexity from the early to late Katian, 2) coarser, but fewer ribs on species from the paleoequatorial intracratonic seas compared to species from the mid-to high-tropical pericratonic shelves and platforms, and 3) enlargement of the cardinal process from early to late Katian and predominance of a trilobed cardinal process in the intracratonic species versus bilobed cardinal process in pericratonic species. Two new species were assigned, and two existing species were reassigned.

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The Pattern of Global Bio-Events During the Ordovician Period

Cited by 40 publications

References 88 publications

Understanding the Great Ordovician Biodiversification Event (GOBE): Influences of paleogeography, paleoclimate, or paleoecology

Understanding the Great Ordovician Biodiversification Event (GOBE): Influences of paleogeography, paleoclimate, or paleoecology

Diversification patterns of Early and Mid Ordovician graptolites in South China

Evolution of the Late Ordovician plaesiomyid brachiopod lineage in Laurentia

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