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Titolo:
Late Ordovician brachiopod biofacies of the Girvan district, SW Scotland
Autore:
Harper, DAT;
Indirizzi:
Univ Copenhagen, Geol Museum, DK-1350 Copenhagen K, Denmark Univ Copenhagen Copenhagen Denmark K seum, DK-1350 Copenhagen K, Denmark
Titolo Testata:
TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH-EARTH SCIENCES
, volume: 91, anno: 2001,
parte:, 3-4
pagine: 471 - 477
SICI:
0263-5933(2001)91:<471:LOBBOT>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
DRUMMUCK GROUP; ASHGILL; FAUNAS; CHINA;
Keywords:
Ashgill; Brachiopoda; Caradoc; palaeobiogeography; palaeoecology; palaeoenvironments;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Harper, DAT Univ Copenhagen, Geol Museum, Oster Voldgade 5-7, DK-1350 Copenhagen K, Denmark Univ Copenhagen Oster Voldgade 5-7 Copenhagen Denmark K nmark
Citazione:
D.A.T. Harper, "Late Ordovician brachiopod biofacies of the Girvan district, SW Scotland", T RS EDIN-E, 91, 2001, pp. 471-477

Abstract

Diverse and abundant brachiopod faunas, associated with unstable outer shelf and slope environments., occur through the Upper Ardmillan Group (upper Caradoc-upper Ashgill) in the Girvan district of SW Scotland. Representatives of the deep-water Folioniena fauna occur intermittently throughout the group, appearing in both the Whitehouse and Drummuck subgroups. This distinctive assemblage of small, thin-shelled brachiopods, including Dedzetina. Christiania, Cyclospira and Foliomena itself, first appeared in South China during the early Caradoc but had colonised the Laurentian margins by the late Caradoc. Within the upper Caradoc-lower Ashgill Whitehouse Subgroup, the Foliomena fauna is interbedded with a variety of other less cosmopolitan deep-water assemblages including the Onniella-Skenidioides and Lingulella-Trimurellina associations. Shallower-water environments in the middle Ashgill Lower Drummuck Subgroup hosted the Fardenia-Eopholidostrophia association in sands, and the Christiania-Leptaena association in muds and silts. The remarkable Lady Burn Starfish Beds in the upper part of the group contain a variety of brachiopod-dominated assemblages including the Eochonetes and Plaesiomys-Schizophorella associations. transported from various shelf locations, within a very diverse mid-Ashgill biota. Nevertheless, elements of the Folioniena fauna persisted to near the top of the Drummuck Subgroup, occurring as rare assemblages in more muddy and silty facies. The upper Ashgill High Mains Formation contains abundant elements of the terminal Ordovician Hirnantia fauna including Eostropheodonta, Hindella and Hirnantia itself, but also some taxa more typical of the Laurentian Edgewood Province. As a whole, the changing brachiopod biofacies monitor environmental fluctuations, on part of the Laurentian margin, driven by mainly eustatic and tectonic events.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 19:09:09