Hirnantian (Latest Ordovician) graptolites from the Upper Yangtze region, China
The Upper Yangtze region yields a Hirnantian (latest Ordovician) graptolite fauna that includes 41 species assigned to 13 genera. This fauna is particularly important for understanding the Late Ordovician mass extinction event because it is the most diverse known from this interval. In addition, it...
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2005
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ftchinacscnigpas:oai:ir.nigpas.ac.cn:332004/19046 2023-05-15T15:07:53+02:00 Hirnantian (Latest Ordovician) graptolites from the Upper Yangtze region, China Xu, C Xuan, FJ Melchin, MJ Mitchell, CE 2005-03-01 http://ir.nigpas.ac.cn/handle/332004/19046 英语 eng WILEY-BLACKWELL PALAEONTOLOGY http://ir.nigpas.ac.cn/handle/332004/19046 Hirnantian graptolites extinction astogenetic pattern Yangtze region SILURIAN BOUNDARY ARCTIC CANADA PHYLOGENETIC CLASSIFICATION FAUNA DIPLOGRAPTACEA GRAPTOLOIDEA CORNWALLIS ORIGIN ISLAND Paleontology 期刊论文 2005 ftchinacscnigpas 2019-08-14T12:44:04Z The Upper Yangtze region yields a Hirnantian (latest Ordovician) graptolite fauna that includes 41 species assigned to 13 genera. This fauna is particularly important for understanding the Late Ordovician mass extinction event because it is the most diverse known from this interval. In addition, it records the survival, well into the Hirnantian, of many taxa of the Dicranograptidae-Diplograptidae-Orthograptidae (DDO) fauna, which was previously regarded as having gone extinct at the beginning of the Hirnantian. Taxa exhibiting six different astogenetic patterns, including taxa with reclined stipes, scandent, biserial, full-periderm and 'archiretiolitid' rhabdosome forms occur in the lower Normalograptus extraordinarius-N. ojsuensis Biozone. In contrast, in the upper N. persculptus Biozone only four genera remain, all but one of which are Normalograptidae: scandent and biserial taxa with Pattern H astogeny. Normalograptids are the dominant form of the succeeding, lower Rhuddanian, faunas. The Yangtze faunas also document the early expansion of normalograptids coeval with the decline of the DDO fauna. Many previously identified species considered endemic to China have been synonymized; 24 of the 41 species recorded here have been recognized elsewhere. No new taxa are described. Report Arctic Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences) Arctic Canada Cornwallis ENVELOPE(-54.464,-54.464,-61.072,-61.072) |
institution |
Open Polar |
collection |
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacscnigpas |
language |
English |
topic |
Hirnantian graptolites extinction astogenetic pattern Yangtze region SILURIAN BOUNDARY ARCTIC CANADA PHYLOGENETIC CLASSIFICATION FAUNA DIPLOGRAPTACEA GRAPTOLOIDEA CORNWALLIS ORIGIN ISLAND Paleontology |
spellingShingle |
Hirnantian graptolites extinction astogenetic pattern Yangtze region SILURIAN BOUNDARY ARCTIC CANADA PHYLOGENETIC CLASSIFICATION FAUNA DIPLOGRAPTACEA GRAPTOLOIDEA CORNWALLIS ORIGIN ISLAND Paleontology Xu, C Xuan, FJ Melchin, MJ Mitchell, CE Hirnantian (Latest Ordovician) graptolites from the Upper Yangtze region, China |
topic_facet |
Hirnantian graptolites extinction astogenetic pattern Yangtze region SILURIAN BOUNDARY ARCTIC CANADA PHYLOGENETIC CLASSIFICATION FAUNA DIPLOGRAPTACEA GRAPTOLOIDEA CORNWALLIS ORIGIN ISLAND Paleontology |
description |
The Upper Yangtze region yields a Hirnantian (latest Ordovician) graptolite fauna that includes 41 species assigned to 13 genera. This fauna is particularly important for understanding the Late Ordovician mass extinction event because it is the most diverse known from this interval. In addition, it records the survival, well into the Hirnantian, of many taxa of the Dicranograptidae-Diplograptidae-Orthograptidae (DDO) fauna, which was previously regarded as having gone extinct at the beginning of the Hirnantian. Taxa exhibiting six different astogenetic patterns, including taxa with reclined stipes, scandent, biserial, full-periderm and 'archiretiolitid' rhabdosome forms occur in the lower Normalograptus extraordinarius-N. ojsuensis Biozone. In contrast, in the upper N. persculptus Biozone only four genera remain, all but one of which are Normalograptidae: scandent and biserial taxa with Pattern H astogeny. Normalograptids are the dominant form of the succeeding, lower Rhuddanian, faunas. The Yangtze faunas also document the early expansion of normalograptids coeval with the decline of the DDO fauna. Many previously identified species considered endemic to China have been synonymized; 24 of the 41 species recorded here have been recognized elsewhere. No new taxa are described. |
format |
Report |
author |
Xu, C Xuan, FJ Melchin, MJ Mitchell, CE |
author_facet |
Xu, C Xuan, FJ Melchin, MJ Mitchell, CE |
author_sort |
Xu, C |
title |
Hirnantian (Latest Ordovician) graptolites from the Upper Yangtze region, China |
title_short |
Hirnantian (Latest Ordovician) graptolites from the Upper Yangtze region, China |
title_full |
Hirnantian (Latest Ordovician) graptolites from the Upper Yangtze region, China |
title_fullStr |
Hirnantian (Latest Ordovician) graptolites from the Upper Yangtze region, China |
title_full_unstemmed |
Hirnantian (Latest Ordovician) graptolites from the Upper Yangtze region, China |
title_sort |
hirnantian (latest ordovician) graptolites from the upper yangtze region, china |
publisher |
WILEY-BLACKWELL |
publishDate |
2005 |
url |
http://ir.nigpas.ac.cn/handle/332004/19046 |
long_lat |
ENVELOPE(-54.464,-54.464,-61.072,-61.072) |
geographic |
Arctic Canada Cornwallis |
geographic_facet |
Arctic Canada Cornwallis |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
PALAEONTOLOGY http://ir.nigpas.ac.cn/handle/332004/19046 |
_version_ |
1766339312602841088 |