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Early diversification of Ordovician chitinozoans on Baltica: New data from the Jagala waterfall section, northern Estonia
Nolvak, Jaak1; Liang, Yan (梁艳)1,2; Hints, Olle1
2019-07
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume525Pages:14-24
Abstract

Chitinozoans are a group of biostratigraphically valuable microfossils which appeared in the Tremadocian and diversified during the rest of the Great Ordovician Biodiversification Event, to become extinct in the Devonian. The early diversification of chitinozoans on the Baltica palaeocontinent has remained poorly known due to preservation and collecting bias. In this study we document the distribution of chitinozoans through the upper Tremadocian to lower Darriwilian strata in the Jagala waterfall section from northern Estonia, in order to better understand the regional diversity patterns and biogeographic links. Fifty samples were studied from the 7.5 m succession of sandstones, marls and carbonates revealing 47 chitinozoan species and 11 genera. The lowermost productive samples, attributed to the late Tremadocian, represent the earliest rich chitinozoan fauna from Baltica. Combined with previous reports this shows a diversity peak in the Tremadocian with balanced total diversity reaching 17, possibly followed by a decline in the Floian and then a rather gradual increase through the Dapingian and early Darriwilian. The new diversity curve shows more than three times higher values for the Tremadocian and Dapingian than indicated in previous studies, and thus less abrupt radiation in the Darriwilian. The Jagala section provided also new data on the regional biozonal species Conochitina cucumis and Cyathochitina regnelli, which characterize the middle and upper Volkhov and lower Kunda regional stages, respectively. Several other biostratigraphically significant taxa typical of other regions were recovered from the Jagala section, including Conochitina decipiens and Desmochitina bulla. A new short-ranging species Laufeldochitina toilaensis sp. nov. is introduced, having potential to become an index species for middle Dapingian strata. The early Darriwilian assemblage from Jagala includes Rhabdochitina sp. A with up to 2.7 mm long vesicle, making it the largest chitinozoan ever reported.

KeywordBiodiversity Gobe Tremadocian Dapingian Darriwilian Baltoscandia
DOI10.1016/j.palaeo.2019.04.002
Indexed BySCI
Language英语
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000468711700002
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/22349
Collection中国科学院南京地质古生物研究所
中国科学院南京地质古生物研究所
Affiliation1.Tallinn Univ Technol, Dept Geol, Ehitajate Tee 5, EE-19086 Tallinn, Estonia;
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, CAS Key Lab Econ Stratig & Palaeogeog, 39 East Beijing Rd, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Nolvak, Jaak,Liang, Yan ,Hints, Olle. Early diversification of Ordovician chitinozoans on Baltica: New data from the Jagala waterfall section, northern Estonia[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2019,525:14-24.
APA Nolvak, Jaak,Liang, Yan ,&Hints, Olle.(2019).Early diversification of Ordovician chitinozoans on Baltica: New data from the Jagala waterfall section, northern Estonia.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,525,14-24.
MLA Nolvak, Jaak,et al."Early diversification of Ordovician chitinozoans on Baltica: New data from the Jagala waterfall section, northern Estonia".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 525(2019):14-24.
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