Number of the records: 1
Uppermost Ordovician (upper Katian-Hirnantian) graptolites of north-central Nevada, U.S.A
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SYSNO ASEP 0361335 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Uppermost Ordovician (upper Katian-Hirnantian) graptolites of north-central Nevada, U.S.A Author(s) Štorch, Petr (GLU-S) RID, SAI, ORCID
Mitchell, Ch. E. (US)
Finney, S. C. (US)
Melchin, M. J. (CA)Source Title Bulletin of Geosciences. - : Česká geografická společnost - ISSN 1214-1119
Roč. 86, č. 2 (2011), s. 301-386Number of pages 86 s. Publication form WWW - WWW Language eng - English Country CZ - Czech Republic Keywords Ordovician ; graptolites ; mass extinction ; biostratigraphy Subject RIV DB - Geology ; Mineralogy R&D Projects IAA301110908 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30130516 - GLU-S (2005-2011) UT WOS 000291926200009 EID SCOPUS 79959732311 DOI 10.3140/bull.geosci.1264 Annotation 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. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2012
Number of the records: 1