Diversification, Faunal Change, and Community Replacement during the Ordovician Radiations

Sepkoski, J. John; Sheehan, Peter M.

doi:10.1007/978-1-4757-0740-3_14

Cited by 142 publications

(91 citation statements)

References 72 publications

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“…In addition to Trypanites, other possible large borings in hardgrounds are common in the Lower Ordovician of Baltica (DRONOV et alii, 1996(DRONOV et alii, , 2000EKDALE & BROMLEY, 2001). The Ordovician was a time of great biodiversification (GOBE: SEPKOSKI & SHEEHAN, 1983;SEPKOSKI, 1995;MILLER, 2003;ZHANG et alii, 2010). Diversification of boring organisms, termed the Ordovician Bioerosion Revolution, was a function of this event.…”

Section: Introductionmentioning

confidence: 99%

Early large borings in a hardground of Floian-Dapingian age (Early and Middle Ordovician) in northeastern Estonia (Baltica)

Vinn¹,

Wilson²

2010

Carnets De Géologie (Notebooks on Geology)

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Large plug-or slightly amphora-shaped borings have been found in the hardground marking the boundary between Early and Middle Ordovician rocks in northeastern Estonia. These borings cut large bioclasts of the trilobite Megistaspis and cannot be assigned with certainty to any known ichnotaxon. They indicate that the diversity of early borings may have been greater than was recognized previously.Key Words: Bioerosion; Gastrochaenolites; hardground; Early Ordovician; Baltica.

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Section: Introductionmentioning

confidence: 99%

Early large borings in a hardground of Floian-Dapingian age (Early and Middle Ordovician) in northeastern Estonia (Baltica)

Vinn¹,

Wilson²

2010

Carnets De Géologie (Notebooks on Geology)

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“…For example, marine invertebrate genera display a strong association to specific environments over timescales approaching 10 Myr [53 -57]. Families and orders of marine invertebrates commonly show a broader distribution among environments than genera at any one time, as well as a drift to deeper-water environments over timescales of tens to hundreds of millions of years [50,[58][59][60][61].…”

Section: (B) Preservation Varies Among Depositional Environmentsmentioning

confidence: 99%

The non-uniformity of fossil preservation

Holland¹

2016

Phil. Trans. R. Soc. B

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The fossil record provides the primary source of data for calibrating the origin of clades. Although minimum ages of clades are given by the oldest preserved fossil, these underestimate the true age, which must be bracketed by probabilistic methods based on multiple fossil occurrences. Although most of these methods assume uniform preservation rates, this assumption is unsupported over geological timescales. On geologically long timescales (more than 10 Myr), the origin and cessation of sedimentary basins, and long-term variations in tectonic subsidence, eustatic sea level and sedimentation rate control the availability of depositional facies that preserve the environments in which species lived. The loss of doomed sediments, those with a low probability of preservation, imparts a secular trend to fossil preservation. As a result, the fossil record is spatially and temporally non-uniform. Models of fossil preservation should reflect this non-uniformity by using empirical estimates of fossil preservation that are spatially and temporally partitioned, or by using indirect proxies of fossil preservation. Geologically, realistic models of preservation will provide substantially more reliable estimates of the origination of clades.This article is part of the themed issue 'Dating species divergences using rocks and clocks'.

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“…Recent work by Alroy (2010a, b) and Alroy et al (2008) Although the diversity of all groups increased during the Ordovician, the Paleozoic fauna diversified much more than the Cambrian and Modern faunas ( Figure 1.2). This expansion was concentrated in nearshore and offshore environments, as the Paleozoic fauna already dominated mid-shelf environments by the Early Ordovician (Sepkoski and Sheehan 1983). This Paleozoic fauna consisted mainly of articulated brachiopods, corals, cephalopods, bryozoans, echinoderms, and ostracods (Sepkoski 1984).…”

Section: The Great Ordovician Biodiversification Event (Gobe)mentioning

confidence: 99%

“…Ordovician (Sepkoski and Sheehan 1983). This Paleozoic fauna consisted mainly of articulated brachiopods, corals, cephalopods, bryozoans, echinoderms, and ostracods (Sepkoski 1984) -dominantly filter feeders.…”

Section: The Paleozoic Faunamentioning

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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Diversification, Faunal Change, and Community Replacement during the Ordovician Radiations

Cited by 142 publications

References 72 publications

Early large borings in a hardground of Floian-Dapingian age (Early and Middle Ordovician) in northeastern Estonia (Baltica)

Early large borings in a hardground of Floian-Dapingian age (Early and Middle Ordovician) in northeastern Estonia (Baltica)

The non-uniformity of fossil preservation

Evolution of the Late Ordovician plaesiomyid brachiopod lineage in Laurentia

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