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Nestor, V., 1998a

Nestor, V. 1998. Chitinozoan biofacies of late early Llandovery (Coronograptus cyphus) age in the East Baltic. Proceedings of the Estonian Academy of Sciences. Geology 47 (4), 219-228. PDF | DOI | DETAILS

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ID1052
ReferenceNestor, V., 1998a
AuthorNestor, V.
Year1998
TitleChitinozoan biofacies of late early Llandovery (Coronograptus cyphus) age in the East Baltic
JournalProceedings of the Estonian Academy of Sciences. Geology
Volume47
Number4
pgs.219-228
Source typearticle in journal
LanguageEnglish
Remarks2 fototahvlit
DOI10.3176/geol.1998.4.01
Abstract

Four lateral chitinozoan biofacies, mainly defined by the distribution of Cyathochitina species, are recognized from the uppermost lower Llandovery strata (Coronograptus cyphus age) in 18 eastern Baltic sections. Cyathochitina kuckersiana (Eisenack, 1934) seems to have preferred shallow-water near-shore conditions and C. calix (Eisenack, 1931) deeper parts of the shelf, whereas C. campanulaeformis (Eisenack, 1931) is more widespread. Representatives of the genus Cyathochitina appear to be absent in most of the near-shore environment. However, these chitinozoan biofacies are probably of only regional significance and occur where calcareous muds (which formed calcitulites) were deposited.


Sections studied or mentioned

Localitypgs.Figs.Remarks
Martna 1 boreholeMartna puurauk
Ohesaare borehole2222
Puikule 42 borehole2233
Ventspils D-3 borehole
Viki borehole2222

Photos

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<i><i>Ancyrochitina ancyrea</i></i><br />Ohesaare borehole, 391.35 m, Raikküla Stage (272-35) <i><i>Ancyrochitina bifurcaspina</i></i><br />Ohesaare borehole, 391.35 m, Raikküla Stage (272-12) <i><i>Ancyrochitina bifurcaspina</i></i><br />Ohesaare borehole, 391.35 m, Raikküla Stage (272-12) <i><i>Ancyrochitina ramosaspina</i></i><br />Ikla borehole, 480.40 m, Raikküla Stage (272-21) <i><i>Euconochitina electa</i> | Conochitina electa Nestor, 1980</i><br />Sõru 400 borehole, 41.20 m, Raikküla Stage (212-15) <i><i>Euconochitina electa</i> | Conochitina electa Nestor, 1980</i><br />Sõru 400 borehole, 41.30 m, Raikküla Stage (332-1) <i><i>Euconochitina electa</i> | Conochitina electa Nestor, 1980</i><br />Ventspils D-3 borehole, 867.00 m, Raikküla Stage (332-2) <i><i>Conochitina iklaensis</i></i><br />Ruhnu 500 borehole, 584.00 m, Raikküla Stage (213-6) <i><i>Conochitina iklaensis</i></i><br />Ruhnu 500 borehole, 584.00 m, Raikküla Stage (213-6) <i><i>Conochitina iklaensis</i></i><br />Ruhnu 500 borehole, 584.00 m, Raikküla Stage (332-3) <i><i>Spinachitina maennili</i> | Coronochitina maennili Nestor, 1980</i><br />Ruhnu 500 borehole, 573.30 m, Raikküla Stage (213-4) <i><i>Spinachitina maennili</i> | Coronochitina maennili Nestor, 1980</i><br />Ruhnu 500 borehole, 573.30 m, Raikküla Stage (213-4) <i><i>Cyathochitina calix</i></i><br />Ohesaare borehole, 399.00 m, Raikküla Stage (272-153) <i><i>Cyathochitina calix</i></i><br />Ruhnu 500 borehole, 576.20 m, Raikküla Stage (332-4) <i><i>Cyathochitina calix</i></i><br />Ruhnu 500 borehole, 576.20 m, Raikküla Stage (332-4) <i><i>Cyathochitina campanulaeformis</i></i><br />Seliste 173 borehole, 340.30 m, Juuru Stage (332-5) <i><i>Cyathochitina kuckersiana</i></i><br />Varbla 502 borehole, 189.85 m, Raikküla Stage (332-6) <i><i>Cyathochitina kuckersiana</i></i><br />Varbla 502 borehole, 189.85 m, Raikküla Stage (332-6) <i><i>Plectochitina</i> | Plectochitina cf. spongiosa (Achab, 1977)</i><br />Kolka 54 borehole, 640.80 m, Raikküla Stage (332-7) <i><i>Spinachitina maennili</i></i><br />Ikla borehole, 462.90 m, Raikküla Stage (213-3) <i><i>Spinachitina maennili</i></i><br />Ikla borehole, 462.90 m, Raikküla Stage (213-3)