Fossil terrestrial ecosystems

Brenchley, P. J.; Harper, David A. T.

doi:10.1007/978-1-4684-1410-3_10

Cited by 6 publications

(8 citation statements)

References 18 publications

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Section: Analysis Of Brachiopod Communitiesmentioning

confidence: 99%

“…In this study, brachiopod 'associations' are delineated following the concept of Brenchley and Harper (1998) by statistically clustering the spot samples from single beds. The term 'community' is used in the sense of 'palaeocommunity' (sensu Brenchley and Harper 1998;Boucot and Lawson 1999) for the preserved part of a once-living brachiopod community during the Ordovician (Zhan et al 2002). A brachiopod palaeocommunity (shortened as community hereafter) reported in this study is inferred to have been a natural group of taxa because of its relatively stable, usually recurrent combination of brachiopod species.…”

Section: Analysis Of Brachiopod Communitiesmentioning

confidence: 99%

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β‐diversity fluctuations in Early–Mid Ordovician brachiopod communities of South China

2006

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Lower to Middle Ordovician transitional strata (Acrograptus filiformis Biozone to Exigraptus clavus Biozone) of the Upper Yangtze Platform contain rich and diverse brachiopods, particularly in the Daguanshan Formation of Sichuan Province, the Meitan Formation of Guizhou Province, and the Yingpan Formation of Houping, Chongqing City. On the basis of multivariate analyses of 207 samples (about 15 000 brachiopod specimens) and 61 species from these strata, 23 brachiopod-dominated communities and associations are delineated through six graptolitic biozones (Acrograptus filiformis to Exigraptus clavus biozones). The disparity of brachiopod associations or -diversity, as measured by the number of contemporaneous associations across variable ecological settings, was low in the A. filiformis Biozone and increased through the overlying graptolitic biozones to reach an acme in the Azygograptus suecisus and Expansograptus hirundo biozones, where as many as nine different brachiopod associations thrived in mid-shelf and also established in inner-and outer-shelf environments. Despite a sharp increase in -diversity within the Didymograptellus eobifidus Biozone, -diversity remained relatively low, with only three distinct brachiopod communities. The diversity of brachiopod associations suffered an abrupt drop in the E. clavus Biozone, as a result of a major faunal turnover event, with only a single Metorthis Community present in an upper mid-shelf setting. Temporally, brachiopod associations appear to be most stable in mid-shelf settings, with the Paralenorthis, Sinorthis, Desmorthis, and Euorthisina communities having a relatively high -diversity and lasting through two to five graptolitic biozones. In both species composition and temporal duration, the brachiopod associations at the shallow-(BA1 to upper BA2) and deep-shelf (BA4) settings are unstable, characterized by low -diversity and rapid vertical changes. This study implies that, during the Early and Mid Ordovician, brachiopod communities already attained a high level of organization in mid-shelf settings, but remained poorly established in high-stress environments of very shallow or very deep shelf settings.

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Section: Analysis Of Brachiopod Communitiesmentioning

confidence: 99%

Section: Analysis Of Brachiopod Communitiesmentioning

confidence: 99%

β‐diversity fluctuations in Early–Mid Ordovician brachiopod communities of South China

2006

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“…The presence of subrounded automicrite intraclasts and the transitional boundary with the surrounding automicrite lithofacies (L7) suggests that L8 is contemporaneous with the mud mound complex core formation. Also, brachiopod assemblages in the lenses, which represent in situ life assemblages (sensu Brenchley and Harper 1998;Carniti et al 2022) are the same as those occurring in association with the automicrite (L7, L9). This interpretation might apply also to other macrofaunal "pockets" in Mississippian mud mounds, e.g.…”

Section: Brachiopod Distributionmentioning

confidence: 92%

Revisiting the upper Visean mud mounds from Derbyshire (UK): the role of brachiopods in their growth

Carniti

Porta

Banks

et al. 2023

Facies

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Several brachiopod-rich mud mounds occur in the upper Visean (Brigantian) of the Derbyshire Carbonate Platform succession in UK. The re-evaluation of the lithofacies architecture of a Derbyshire mud mound complex, developed in an intraplatform middle-ramp environment, led to the recognition of three lithofacies associations: (a) a 10 m thick basal unit of automicrite boundstone with siliceous sponge spicules and brachiopod–bryozoan packstone to wackestone beds; (b) a 10 m thick, 250 m wide, lens-shaped, convex-up massive core of clotted peloidal micrite and fenestellid bryozoan boundstone with sponge spicules; (c) inclined brachiopod–bryozoan–crinoid packstone flank beds. In the mud mound complex core, most of the carbonate mud with clotted peloidal and structureless micrite fabric is the result of biologically induced and influenced in-situ precipitation processes (automicrite). Brachiopods are not, as previously thought, limited to storm-scoured “pockets” in the mud mound complex core but are abundant and diverse in all lithofacies and lived on the irregular mud mound complex surface concentrating in depressions sustained by automicrite boundstone and the growth of bryozoans and sponges. The upper Visean Derbyshire mud mounds are, thus, representatives of a newly defined fenestellid bryozoan–brachiopod–siliceous sponge mud mound category, occurring in various middle–upper Visean Western European sites, a sub-type of the fenestellid bryozoan–crinoid–brachiopod Type 3 buildups of Bridges et al. (1995). These mud mounds, and other types of brachiopod-rich buildups, developed in carbonate platform settings between fair-weather and storm wave base, in dysphotic environments with dispersed food resources during the Visean. Brachiopod mud mound colonisation was favoured by moderate water depth, availability of food resources, and diverse substrates.

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“…Dechenellinae appear to be slightly more common in the upper Eifelian in the Ardenne than in coeval strata in the adjacent German Eifel (Basse 2002). The term 'association' is used here for assemblages of trilobites with similar taxonomic composition (Brenchley & Harper 1998;Thomas & Lane 1999).…”

Section: Dechenella and Nyterops Associationmentioning

confidence: 99%

Middle Devonian trilobites from the Mont d’Haurs section in Givet, France, with two new species of Dechenella

Bignon

Crônier

2011

Earth and Environmental Science Transactions of the Royal Socie

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Recent investigation of the historical Mont d’Haurs section near Givet yielded numerous trilobites from Middle Devonian carbonate deposits. The trilobite fauna described in the present paper comprises a number of taxa from the basal Givetian, including two new ones: Dechenella givetensis sp. n.; Dechenella calxensis sp. n.; Dechenella ziegleri Struve, 1992; Goldius cf. capitellum (Archinal, 1994); and Nyterops cf. hollandi van Viersen, 2007a. This fauna confirms the previously recognised taxonomic diversity pattern and the Dechenella and Nyterops Association from the middle Middle Devonian in the Ardenne area.

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Fossil terrestrial ecosystems

Cited by 6 publications

References 18 publications

β‐diversity fluctuations in Early–Mid Ordovician brachiopod communities of South China

β‐diversity fluctuations in Early–Mid Ordovician brachiopod communities of South China

Revisiting the upper Visean mud mounds from Derbyshire (UK): the role of brachiopods in their growth

Middle Devonian trilobites from the Mont d’Haurs section in Givet, France, with two new species of Dechenella

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