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Nõlvak et al., 2022

Nõlvak, J., Liang, Y., Hints, O. 2022. Early and early Middle Ordovician chitinozoans from the Baldone drill core, central Latvia. Estonian Journal of Earth Sciences 71 (1), 25-43. PDF | DOI | DETAILS

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ID36115
ReferenceNõlvak et al., 2022
AuthorNõlvak, J., Liang, Y., Hints, O.
Year2022
TitleEarly and early Middle Ordovician chitinozoans from the Baldone drill core, central Latvia
JournalEstonian Journal of Earth Sciences
Volume71
Number1
pgs.25-43
Source typearticle in journal
LanguageEnglish
DOI10.3176/earth.2022.03
Abstract

Early and early Middle Ordovician chitinozoans are relatively poorly known in Baltoscandia, thus the understanding of the early diversification of the group, as well as its biostratigraphic utility, is limited. In this paper, we document the distribution of chitinozoans in the Floian and lower Darriwilian strata of the Baldone drill core from central Latvia, a region from where very limited data on chitinozoans have hitherto been available. The Baldone section hosts one of the thickest upper Lower to lower Middle Ordovician sequences in eastern Baltoscandia and is represented by ca 85 m of red-coloured, mottled and less commonly grey marls and limestones. Chitinozoans were collected from 20 samples, revealing altogether at least 13 genera and 35 species. The lowermost productive sample, attributed to the lower Floian, represents one of the oldest chitinozoan faunas from Baltica. The upper Floian and Dapingian redbeds are barren of chitinozoans, but the lower Darriwilian Šakyna and Baldone formations contain a rich and wellpreserved assemblage with range-through taxonomic diversity reaching up to 19 species per sample. The Baldone section provides new insights into the distribution of the regional biozonal species Cyathochitina regnelli, which is characteristic of the Kunda Regional Stage in Estonia and Sweden. Several other biostratigraphically significant species of Cyathochitina, Conochitina and Lagenochitina that are typical of other regions were also recovered. They suggest links with chitinozoan assemblages of other continents during the early Darriwilian. Based on the rich collection at hand, chitinozoan diversity estimates for early Darriwilian are increased, and four new chitinozoan species are described: Bursachitina baldonia, Conochitina ulsti, Eremochitina? procera and Sphaerochitina? latviensis.


New taxa described

RankTaxon nameBelongs to
SpeciesBursachitina baldonia Nõlvak, Liang et Hints, 2022Bursachitina
SpeciesConochitina ulsti Nõlvak, Liang et Hints, 2022Conochitina
SpeciesEremochitina? procera Nõlvak, Liang et Hints, 2022Eremochitina

Sections studied or mentioned

Localitypgs.Figs.Remarks
Baldone 80 boreholeDistribution of chitinozoans in Lower and Middle Ordovician

Photos

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<i><i>Bursachitina baldonia</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-77) <i><i>Bursachitina baldonia</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-78) <i><i>Bursachitina baldonia</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-79) <i><i>Bursachitina baldonia</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-80) <i><i>Bursachitina baldonia</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-83) <i><i>Clavachitina grandicula</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-24) <i><i>Clavachitina langei</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-12) <i><i>Clavachitina langei</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-13) <i><i>Conochitina</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-27) <i><i>Conochitina</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-28) <i><i>Conochitina exilis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-68) <i><i>Conochitina exilis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-69) <i><i>Conochitina minnesotensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-102) <i><i>Conochitina minnesotensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-104) <i><i>Conochitina minnesotensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-105) <i><i>Conochitina minnesotensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-102) <i><i>Conochitina minnesotensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-103) <i><i>Conochitina minnesotensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-104) <i><i>Conochitina minnesotensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-105) <i><i>Conochitina ordinara</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-72) <i><i>Conochitina ordinara</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-73) <i><i>Conochitina ordinara</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-74) <i><i>Conochitina raymondii</i></i><br />Baldone 80 borehole,  m, Billingen Stage (854-75) <i><i>Conochitina raymondii</i></i><br />Baldone 80 borehole,  m, Billingen Stage (854-76) <i><i>Conochitina ulsti</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-14) <i><i>Conochitina ulsti</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-15) <i><i>Conochitina ulsti</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-16) <i><i>Conochitina ulsti</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-23) <i><i>Conochitina ulsti</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-17) <i><i>Conochitina ulsti</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-18) <i><i>Conochitina ulsti</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-19) <i><i>Conochitina ulsti</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-20) <i><i>Conochitina ulsti</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-21) <i><i>Conochitina ulsti</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-22) <i><i>Cyathochitina calix</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-37) <i><i>Cyathochitina calix</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-38) <i><i>Cyathochitina calix</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-39) <i><i>Cyathochitina calix</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-40) <i><i>Cyathochitina calix</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-41) <i><i>Cyathochitina calix</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-42) <i><i>Cyathochitina calix</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-43) <i><i>Cyathochitina campanulaeformis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-33) <i><i>Cyathochitina campanulaeformis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-34) <i><i>Cyathochitina hunderumensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-35) <i><i>Cyathochitina hunderumensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-36) <i><i>Cyathochitina jagovalensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-44) <i><i>Cyathochitina jagovalensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-45) <i><i>Cyathochitina jagovalensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-46) <i><i>Cyathochitina jagovalensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-47) <i><i>Cyathochitina jagovalensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-48) <i><i>Cyathochitina jagovalensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-49) <i><i>Cyathochitina jagovalensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-50) <i><i>Cyathochitina regnelli</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-57) <i><i>Cyathochitina regnelli</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-58) <i><i>Cyathochitina regnelli</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-59) <i><i>Cyathochitina regnelli</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-60) <i><i>Desmochitina erinacea</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-29) <i><i>Desmochitina erinacea</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-30) <i><i>Desmochitina minor</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-81) <i><i>Desmochitina minor</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-82) <i><i>Eremochitina baculata</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-94) <i><i>Eremochitina baculata</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-95) <i><i>Eremochitina baculata</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-96) <i><i>Eremochitina baculata</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-97) <i><i>Eremochitina baculata</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-94) <i><i>Eremochitina baculata</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-95) <i><i>Eremochitina baculata</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-96) <i><i>Eremochitina baculata</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-97) <i><i>Eremochitina? procera</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-98) <i><i>Eremochitina? procera</i></i><br />Baldone 80 borehole, 923.20 m, Kunda Stage (854-99) <i><i>Eremochitina? procera</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-100) <i><i>Eremochitina? procera</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-101) <i><i>Eremochitina? procera</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-98) <i><i>Eremochitina? procera</i></i><br />Baldone 80 borehole, 923.20 m, Kunda Stage (854-99) <i><i>Eremochitina? procera</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-100) <i><i>Eremochitina? procera</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-101) <i><i>Euconochitina? brevis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-25) <i><i>Euconochitina? brevis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-26) <i><i>Euconochitina? brevis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-31) <i><i>Lagenochitina</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-6) <i><i>Lagenochitina combazi</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-1) <i><i>Lagenochitina combazi</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-2) <i><i>Lagenochitina combazi</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-3) <i><i>Lagenochitina combazi</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-4) <i><i>Lagenochitina combazi</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-5) <i><i>Lagenochitina megaesthonica</i></i><br />Baldone 80 borehole,  m, Kunda Stage (833-4) <i><i>Lagenochitina megaesthonica</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-9) <i><i>Lagenochitina megaesthonica</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-10) <i><i>Lagenochitina megaesthonica</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-11) <i><i>Lagenochitina ovoidea</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-32) <i><i>Lagenochitina pestovoensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-7) <i><i>Lagenochitina pestovoensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-8) <i><i>Rhabdochitina gracilis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-91) <i><i>Rhabdochitina gracilis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-92) <i><i>Rhabdochitina gracilis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-93) <i><i>Sphaerochitina? latviensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-52) <i><i>Sphaerochitina? latviensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-53) <i><i>Sphaerochitina? latviensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-54) <i><i>Sphaerochitina? latviensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-51) <i><i>Sphaerochitina? latviensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-55) <i><i>Sphaerochitina? latviensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-56) <i><i>Tanuchitina granbyensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-85) <i><i>Tanuchitina granbyensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-86) <i><i>Tanuchitina granbyensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-85) <i><i>Tanuchitina granbyensis</i></i><br />Baldone 80 borehole,  m, Kunda Stage (854-86) <i><i>Angochitina</i> | Angochitina sp. 1</i><br />Baldone 80 borehole,  m, Kunda Stage (854-71) <i><i>Belonechitina</i> | Belonechitina sp. 1</i><br />Baldone 80 borehole,  m, Kunda Stage (854-84) <i><i>Conochitina</i> | Conochitina sp. 2</i><br />Baldone 80 borehole,  m, Kunda Stage (854-66) <i><i>Conochitina</i> | Conochitina sp. 2</i><br />Baldone 80 borehole,  m, Kunda Stage (854-67) <i><i>Euconochitina</i> | Euconochitina sp.</i><br />Baldone 80 borehole,  m, Kunda Stage (854-70) <i><i>Lagenochitina</i> | Lagenochitina sp. 2</i><br />Baldone 80 borehole,  m, Kunda Stage (854-62) <i><i>Lagenochitina</i> | Lagenochitina sp. 2</i><br />Baldone 80 borehole,  m, Kunda Stage (854-63) <i><i>Lagenochitina</i> | Lagenochitina sp. 3</i><br />Baldone 80 borehole,  m, Kunda Stage (854-64) <i><i>Lagenochitina</i> | Lagenochitina sp. 3</i><br />Baldone 80 borehole,  m, Kunda Stage (854-65) <i><i>Rhabdochitina</i> | Rhabdochitina? sp. 1</i><br />Baldone 80 borehole,  m, Kunda Stage (854-89) <i><i>Rhabdochitina</i> | Rhabdochitina? sp. 1</i><br />Baldone 80 borehole,  m, Kunda Stage (854-87) <i><i>Rhabdochitina</i> | Rhabdochitina? sp. 1</i><br />Baldone 80 borehole,  m, Kunda Stage (854-88) <i><i>Rhabdochitina</i> | Rhabdochitina? sp. 1</i><br />Baldone 80 borehole,  m, Kunda Stage (854-89) <i><i>Rhabdochitina</i> | Rhabdochitina? sp. 1</i><br />Baldone 80 borehole,  m, Kunda Stage (854-90)