A global synthesis of the latest Ordovician Hirnantian brachiopod faunas
- 1 January 1988
- journal article
- research article
- Published by Cambridge University Press (CUP) in Earth and Environmental Science Transactions of the Royal Society of Edinburgh
- Vol. 79 (4), 383-402
- https://doi.org/10.1017/s026359330001436x
Abstract
A global review of new and existing data on the distribution of uppermost Ordovician (Hirnantian) brachiopods indicates the existence of at least three biogeographically distinct faunas. The typical Hirnantia fauna characterised subtropical and temperate latitudes and comprised a variety of ecological associations; the fauna reached its acme during the bohemicus and uniformis zones. Atypical Hirnantia faunas, developed marginal to Gondwana, are of low diversity and have few species in common with the typical Hirnantia fauna; their spatial distribution probably marked the margin of the polar ice sheets. The extinction of the Hirnantia fauna occurred in response to changes in sea level. Diverse and quite different faunas, including those from the Midcontinent of North America, Kolyma, the Oslo Region and probably Anticosti Island, occupied equatorial latitudes during the latest Ordovician. The Holorhynchus fauna, on evidence to date, predates the Hirnantia fauna.Keywords
This publication has 39 references indexed in Scilit:
- Découverte de Hirnantia sagittifera (M'Coy, 1851)(Orthida, Brachiopoda) dans l'Ordovicien supérieur (Ashgillien) de l'extrémité occidentale du Massif ArmoricainGeobios, 1987
- Top Ordovician and lowest Silurian of Dob’s LinnGeological Society, London, Special Publications, 1986
- Temperature and biotic crises in the marine realmGeology, 1984
- Paleozoic PaleogeographyAnnual Review of Earth and Planetary Sciences, 1979
- Brachiopod Synecology in a Time of Crisis (Late Ordovician-Early Silurian)Paleobiology, 1975
- The relation of Late Ordovician glaciation to the Ordovician‐Silurian changeover in North American brachiopod faunasLethaia, 1973
- A WESTWARD EXTENSION OF THE UPPER ASHGILLIAN HIRNANTIA FAUNALethaia, 1968
- Some aspects of the Caledonian geosyncline and foreland west of the Baltic ShieldQuarterly Journal of the Geological Society, 1967
- Silurian Marine Communities and their Environmental SignificanceNature, 1965
- XXXIII.—On some new Cambro-Silurian FossilsAnnals and Magazine of Natural History, 1851