Tremadocian (Ordovician) reclined graptolites from Baishan, North China

The Erdaopuzi section in the Baishan area of Jilin Province, northeast China, contains abundant late Tremadoc graptolites. However, there are some taxonomic controversies regarding the characters of the hand specimens that are difficult to identify. In this paper, we present our restudy of isolated...

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Bibliographic Details
Published in:Estonian journal of earth sciences 2023-03, Vol.72 (1), p.54-57
Main Authors: Li, Ming, Liu, Pengju, Deng, Liting, Li, Lixia
Format: Article
Language:English
Subjects:
biostratigraphy
Evolution
Genera
graptolite
Morphology
northeast china
Ordovician
Relative dating (Chronology)
Stratigraphy
Taxonomy
tremadocian
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Summary:The Erdaopuzi section in the Baishan area of Jilin Province, northeast China, contains abundant late Tremadoc graptolites. However, there are some taxonomic controversies regarding the characters of the hand specimens that are difficult to identify. In this paper, we present our restudy of isolated graptolites from acid residue and discuss the taxonomic problems of the subgenus Clonograptus (Neoclonograptus) Zhao and Zhang. Four genera and six species were identified, including Adelograptus tenellus (Linnarsson), Ancoragraptus gracilis (Zhao and Zhang), Dictyonema sp., Psigraptus jacksoni Rickards and Stait, Psigraptus lenzi Jackson, Psigraptus arcticus Jackson. According to the significant evolution of morphological characters, two graptolite zones (from bottom to top) can be identified in ascending order in the study area, i.e. Adelograptus Zone and the Psigraptus Zone.
ISSN:1736-4728
1736-7557
DOI:10.3176/earth.2023.55