New trilobite assemblage from the lower Cambrian (upper Stage 4) of the Lake Zone, western Mongolia

The western Mongolian Lake Zone was a Neoproterozoic to early Paleozoic volcanic arc where tuffs, lavas, fossiliferous siliciclastics, and carbonates accumulated during the early Cambrian. An uppermost Cambrian Series 2 (upper Stage 4) trilobite assemblage is described here from the Burgasutay Forma...

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Published inJournal of paleontology Vol. 97; no. 3; pp. 577 - 590
Main Authors Sun, Zhixin, Yang, Aihua, Zhao, Fangchen, Zhuravlev, Andrey Yu, Pan, Bing, Hu, Chunlin, Feng, Qian, Chen, Xi, Zhu, Maoyan
Format Journal Article
LanguageEnglish
Published New York, USA The Paleontological Society 01.05.2023
Cambridge University Press
Subjects
Biogeography
Cambrian
Carbonates
Fossil animals
Fossils
Gondwana
Hypotheses
Lakes
Lava
Marine invertebrates
New species
Paleontology
Paleozoic
Platforms (geology)
REGULAR ARTICLES
Stone
Trilobita
Mongolia
China
Siberia
Russia
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Summary:The western Mongolian Lake Zone was a Neoproterozoic to early Paleozoic volcanic arc where tuffs, lavas, fossiliferous siliciclastics, and carbonates accumulated during the early Cambrian. An uppermost Cambrian Series 2 (upper Stage 4) trilobite assemblage is described here from the Burgasutay Formation representing a continuous lower Cambrian succession at the Seer Ridge of the Great Lake Depression. The new assemblage is dominated by dorypygids and consists of 13 trilobite genera belonging to nine families including Catinouyia heyunensis new species. These fossils comprise the youngest and richest lower Cambrian trilobite assemblage in Mongolia. The composition of the Lake Zone fauna suggests its biogeographic affinity with the Siberian Platform and Altay-Sayan Foldbelt, but the presence of inouyiids also implies a connection of this region with East Gondwana.
ISSN:0022-3360
1937-2337
DOI:10.1017/jpa.2023.23