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Nõlvak & Grahn, 1993

Nõlvak, J., Grahn, Y. 1993. Ordovician chitinozoan zones from Baltoscandia. Review of Palaeobotany and Palynology 79, 245-269. | DOI | DETAILS

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ID542
ReferenceNõlvak & Grahn, 1993
AuthorNõlvak, J., Grahn, Y.
Year1993
TitleOrdovician chitinozoan zones from Baltoscandia
JournalReview of Palaeobotany and Palynology
Volume79
pgs.245-269
Source typearticle in journal
LanguageEnglish
Remarks6 fototahvlit
DOI10.1016/0034-6667(93)90025-P
Abstract

On the basis of reports published over the last 60 years, and unpublished data, a chitinozoan zonation is proposed for the Ordovician sequence of Scandinavia, the East Baltic, northeast Poland and Podolia commonly referred to as Baltoscandia. From the first chitinozoans in the latest Tremadoc to the latest Ashgill (a period comprising ca. 52 My) 15 zones and 8 subzones arc defined, each corresponding to some 1-5 My. These are compared with the graptolite and conodom zonations. The greatest precision is achieved in the succession beginning with the conodont Zone of Amorphognathus tvaerensis, and ending with the lop of the Ordovician, where chitinozoan stratigraphic evolution surpassed that of olher taunal elements. Important associated chitinozoan species in each zone and subzone are discussed.


New taxa described

RankTaxon nameBelongs to
SpeciesAngochitina curvata Nõlvak et Grahn, 1993Angochitina
SpeciesArmoricochitina granulifera Nõlvak et Grahn, 1993Armoricochitina
SpeciesCyathochitina angusta Nõlvak et Grahn, 1993Cyathochitina

Sections studied or mentioned

Localitypgs.Figs.Remarks
Eikla 508 borehole
Hagudi borehole
Hullo 385 borehole
Kuusiku 7017 borehole
Laeva 13 borehole
Moe H-50 borehole
Rapla borehole
Suhkrumägi outcrop
Udriku 3329 borehole

Photos

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<i></i><br />Koksvere 107 borehole, 365.00 m, Kukruse Stage (359-2) <i></i><br />Koksvere 107 borehole, 365.00 m, Kukruse Stage (359-2) <i><i>Acanthochitina barbata</i></i><br />Hullo 385 borehole, 21.00 m, Vormsi Stage (306-1) <i><i>Acanthochitina barbata</i></i><br />Hullo 385 borehole, 21.00 m, Vormsi Stage (306-1) <i><i>Acanthochitina barbata</i></i><br />Hullo 385 borehole, 21.00 m, Vormsi Stage (306-1) <i><i>Acanthochitina barbata</i></i><br />Hullo 385 borehole, 21.00 m, Vormsi Stage (306-1) <i><i>Acanthochitina barbata</i></i><br />Hullo 385 borehole, 21.00 m, Vormsi Stage (306-1) <i><i>Angochitina curvata</i></i><br />Udriku 3329 borehole, 63.70 m, Idavere Substage (359-1) <i><i>Angochitina curvata</i></i><br />Udriku 3329 borehole, 63.70 m, Idavere Substage (359-1) <i><i>Angochitina curvata</i></i><br />Udriku 3329 borehole, 63.70 m, Idavere Substage (359-1) <i><i>Angochitina curvata</i></i><br />Udriku 3329 borehole, 63.70 m, Idavere Substage (359-1) <i><i>Angochitina curvata</i></i><br />Udriku 3329 borehole, 63.70 m, Idavere Substage (359-1) <i><i>Angochitina curvata</i></i><br />Udriku 3329 borehole, 63.70 m, Idavere Substage (359-1) <i><i>Angochitina curvata</i></i><br />Udriku 3329 borehole, 63.70 m, Idavere Substage (359-1) <i><i>Angochitina multiplex</i></i><br />Laeva 13 borehole, 237.00 m, Keila Stage (359-6) <i><i>Armoricochitina granulifera</i></i><br />Imavere 73T borehole, 215.70 m, Idavere Substage (190-15) <i><i>Baltochitina nolvaki</i></i><br />Rapla borehole, 179.20 m, Lasnamägi Stage (190-19) <i><i>Baltochitina nolvaki</i></i><br />Rapla borehole, 179.20 m, Lasnamägi Stage (190-19) <i><i>Baltochitina nolvaki</i></i><br />Rapla borehole, 179.20 m, Lasnamägi Stage (190-19) <i><i>Belonechitina hirsuta</i></i><br />Kuusiku 7017 borehole, 43.00 m, Idavere Substage (359-13) <i><i>Belonechitina hirsuta</i></i><br />Kuusiku 7017 borehole, 43.00 m, Idavere Substage (359-13) <i><i>Conochitina cucumis</i></i><br />Suhkrumägi outcrop, m, Volkhov Stage (357-10) <i><i>Conochitina cucumis</i></i><br />Suhkrumägi outcrop, m, Volkhov Stage (357-10) <i><i>Conochitina rugata</i></i><br />Hagudi borehole, 24.30 m, Pirgu Stage (306-4) <i><i>Conochitina scabra</i></i><br />Kardla 570 borehole, 167.50 m, Porkuni Stage (359-9) <i><i>Conochitina tuberculata</i></i><br />Rapla borehole, 170.00 m, Uhaku Stage (359-12) <i><i>Cyathochitina angusta</i></i><br />Eikla 508 borehole, 290.20 m, Nabala Stage (359-3) <i><i>Eisenackitina rhenana</i></i><br />Viljandi 91 borehole, 365.00 m, Kukruse Stage (359-4) <i><i>Eisenackitina rhenana</i></i><br />Viljandi 91 borehole, 365.00 m, Kukruse Stage (359-4) <i><i>Eremochitina</i> | Eremochitina sp.</i><br />Suhkrumägi outcrop, m, Hunneberg Stage (359-11) <i><i>Eremochitina</i> | Eremochitina sp.</i><br />Suhkrumägi outcrop, m, Hunneberg Stage (359-11) <i><i>Eremochitina</i> | Eremochitina sp.</i><br />Suhkrumägi outcrop, m, Hunneberg Stage (359-11) <i><i>Saharochitina fungiformis</i> | Fungochitina fungiformis (Eisenack, 1931)</i><br />Kaugatuma 509 borehole, 411.00 m, Nabala Stage (359-8) <i><i>Saharochitina fungiformis</i> | Fungochitina fungiformis (Eisenack, 1931)</i><br />Kaugatuma 509 borehole, 411.00 m, Nabala Stage (359-8) <i><i>Saharochitina fungiformis</i> | Fungochitina fungiformis (Eisenack, 1931)</i><br />Kaugatuma 509 borehole, 411.00 m, Nabala Stage (359-8) <i><i>Linochitina</i> | Linochitina sp.</i><br />Rapla borehole, 182.60 m, Kunda Stage (190-25) <i><i>Linochitina</i> | Linochitina sp.</i><br />Rapla borehole, 182.60 m, Kunda Stage (190-25) <i><i>Spinachitina cervicornis</i></i><br />Rapla borehole, 142.70 m, Keila Stage (359-5) <i><i>Spinachitina taugourdeaui</i></i><br />Tartu 554 drillcore, 191.50 m, Pirgu Stage (359-10) <i><i>Tanuchitina bergstroemi</i></i><br />Moe H-50 borehole, 11.90 m, Pirgu Stage (359-7) <i><i>Tanuchitina bergstroemi</i></i><br />Moe H-50 borehole, 11.90 m, Pirgu Stage (359-7) <i><i>Tanuchitina bergstroemi</i></i><br />Moe H-50 borehole, 11.90 m, Pirgu Stage (359-7)