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Uppermost Ordovician (upper Katian-Hirnantian) graptolites of north-central Nevada, U.S.A
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SYSNO ASEP 0361335 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Uppermost Ordovician (upper Katian-Hirnantian) graptolites of north-central Nevada, U.S.A Tvůrce(i) Štorch, Petr (GLU-S) RID, SAI, ORCID
Mitchell, Ch. E. (US)
Finney, S. C. (US)
Melchin, M. J. (CA)Zdroj.dok. Bulletin of Geosciences. - : Česká geografická společnost - ISSN 1214-1119
Roč. 86, č. 2 (2011), s. 301-386Poč.str. 86 s. Forma vydání WWW - WWW Jazyk dok. eng - angličtina Země vyd. CZ - Česká republika Klíč. slova Ordovician ; graptolites ; mass extinction ; biostratigraphy Vědní obor RIV DB - Geologie a mineralogie CEP IAA301110908 GA AV ČR - Akademie věd CEZ AV0Z30130516 - GLU-S (2005-2011) UT WOS 000291926200009 EID SCOPUS 79959732311 DOI 10.3140/bull.geosci.1264 Anotace Rich graptolite fauna described from Katian and Hirnantian of central Nevada suggests that graptolite diversity decreased abruptly at the beginning of Hirnantian glaciation. Faunal turnover reached a peak in the lower part of the extraordinarius Biozone. Ordovician clades were rapidly replaced by normalograptids, presumably evolved in, and invading from, less-temperate higher latitude settings where overall graptolite diversity was extremely low already in pre-glacial times and the old fauna entirely vanished with ongoing glaciation. In tropics, however, elements of the old fauna locally survived and emerged from hypothetical refugia in the upper part of the extraordinarius Zone and, second times, in the persculptus Biozone. The last phase of mass extinction of the long-dominant Ordovician clades took place during postglacial transgression, along with major radiation among normalogratids. Reasons for ultimate extinction of the former fauna may be biological rather than environmental. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2012
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