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Tammekänd et al., 2010

Tammekänd, M., Hints, O., Nõlvak, J. 2010. Chitinozoan dynamics and biostratigraphy in the Väo Formation (Darriwilian) of the Uuga Cliff, Pakri Peninsula, NW Estonia. Estonian Journal of Earth Sciences 59 (1), 25-36. | PDF | DOI | DETAILS

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ID1405
ReferenceTammekänd et al., 2010
AuthorTammekänd, M., Hints, O., Nõlvak, J.
Year2010
TitleChitinozoan dynamics and biostratigraphy in the Väo Formation (Darriwilian) of the Uuga Cliff, Pakri Peninsula, NW Estonia
JournalEstonian Journal of Earth Sciences
Volume59
Number1
pgs.25-36
Source typearticle in journal
LanguageEnglish
DOI10.3176/earth.2010.1.02
Abstract

The distribution of chitinozoans in the Väo Formation (Lasnamägi and Uhaku regional stages, Darriwilian) of the Uuga Cliff, Pakri Peninsula, NW Estonia, was investigated from 62 samples. Chitinozoans are very common and assemblages are diverse, with a total of 36 species and up to 170 specimens per gram of rock. The assemblage is dominated by Belonechitina, Desmochitina, Cyathochitina, and Euconochitina. The relative and absolute frequency of particular taxa displays regular and possibly cyclic patterns, which are not directly reflected in lithology or geochemistry. Abrupt changes in chitinozoan abundance, coinciding with some of the discontinuity surfaces, suggest the presence of stratigraphical gaps. The diversity of chitinozoans is the highest in the lower part of the Väo Formation (Rebala Member), where up to 20 species were identified in one sample and the standing species diversity exceeded 25. Within the studied interval at least 11 biostratigraphical horizons can be distinguished, including the subzonal boundaries within the Laufeldochitina striata Zone. The disappearance of abundant Belonechitina pellifera can be used for tracing the lower boundary of the Uhaku Stage.


Sections studied or mentioned

Localitypgs.Figs.Remarks
Uuga Cliff 1, Parki peninsulaAseri to Uhaku Stage, chitinozoans and geochemistry

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<i><i>Belonechitina cactacea</i></i><br />Uuga Cliff 1, Parki peninsula, 1.30 m, Lasnamägi Stage ( 590-16) <i><i>Belonechitina crinita</i></i><br />Uuga Cliff 1, Parki peninsula, 0.90 m, Lasnamägi Stage ( 590-13) <i><i>Belonechitina micracantha</i></i><br />Uuga Cliff 1, Parki peninsula, 0.00 m, Lasnamägi Stage ( 590-10) <i><i>Belonechitina micracantha</i></i><br />Uuga Cliff 1, Parki peninsula, 1.83 m, Lasnamägi Stage ( 590-11) <i><i>Belonechitina micracantha</i></i><br />Uuga Cliff 1, Parki peninsula, 1.83 m, Lasnamägi Stage ( 590-12) <i><i>Belonechitina pellifera</i></i><br />Uuga Cliff 1, Parki peninsula, 1.30 m, Lasnamägi Stage ( 590-14) <i><i>Belonechitina pellifera</i></i><br />Uuga Cliff 1, Parki peninsula, 1.30 m, Lasnamägi Stage ( 590-15) <i><i>Belonechitina</i> | Belonechitina sp.</i><br />Uuga Cliff 1, Parki peninsula, 1.22 m, Lasnamägi Stage ( 590-17) <i><i>Conochitina clavaherculi</i></i><br />Uuga Cliff 1, Parki peninsula, 0.76 m, Lasnamägi Stage ( 590-18) <i><i>Conochitina clavaherculi</i></i><br />Uuga Cliff 1, Parki peninsula, 0.76 m, Lasnamägi Stage ( 590-19) <i><i>Conochitina</i> | Conochitina sp.</i><br />Uuga Cliff 1, Parki peninsula, 1.22 m, Lasnamägi Stage ( 590-20) <i><i>Conochitina tuberculata</i></i><br />Uuga Cliff 1, Parki peninsula, 5.04 m, Uhaku Stage ( 590-21) <i><i>Cyathochitina calix</i></i><br />Uuga Cliff 1, Parki peninsula, 4.30 m, Uhaku Stage ( 590-27) <i><i>Cyathochitina calix</i></i><br />Uuga Cliff 1, Parki peninsula, 0.41 m, Lasnamägi Stage ( 590-28) <i><i>Cyathochitina campanulaeformis</i></i><br />Uuga Cliff 1, Parki peninsula, -0.12 m, Aseri Formation ( 590-25) <i><i>Chitinozoa</i> | Cyathochitina cf. sebyensis Grahn, 1981</i><br />Uuga Cliff 1, Parki peninsula, 0.90 m, Lasnamägi Stage ( 590-30) <i><i>Cyathochitina kuckersiana</i></i><br />Uuga Cliff 1, Parki peninsula, 0.76 m, Lasnamägi Stage ( 590-29) <i><i>Cyathochitina sebyensis</i></i><br />Uuga Cliff 1, Parki peninsula, 0.00 m, Aseri Formation ( 590-26) <i><i>Desmochitina cocca</i></i><br />Uuga Cliff 1, Parki peninsula, 0.90 m, Lasnamägi Stage ( 590-7) <i><i>Desmochitina elongata</i></i><br />Uuga Cliff 1, Parki peninsula, 1.90 m, Lasnamägi Stage ( 590-1) <i><i>Desmochitina erinacea</i></i><br />Uuga Cliff 1, Parki peninsula, 0.90 m, Lasnamägi Stage ( 590-6) <i><i>Chitinozoa</i> | Desmochitina minor s. l. Eisenack</i><br />Uuga Cliff 1, Parki peninsula, 0.90 m, Lasnamägi Stage ( 590-5) <i><i>Desmochitina ovulum</i></i><br />Uuga Cliff 1, Parki peninsula, 0.90 m, Lasnamägi Stage ( 590-2) <i><i>Desmochitina piriformis</i></i><br />Uuga Cliff 1, Parki peninsula, 1.90 m, Lasnamägi Stage ( 590-4) <i><i>Desmochitina rugosa</i></i><br />Uuga Cliff 1, Parki peninsula, 0.90 m, Lasnamägi Stage ( 590-3) <i><i>Lagenochitina tumida</i></i><br />Uuga Cliff 1, Parki peninsula, 0.76 m, Lasnamägi Stage ( 590-31) <i><i>Lagenochitina tumida</i></i><br />Uuga Cliff 1, Parki peninsula, 0.76 m, Lasnamägi Stage ( 590-32) <i><i>Laufeldochitina striata</i></i><br />Uuga Cliff 1, Parki peninsula, 0.76 m, Lasnamägi Stage ( 590-23) <i><i>Laufeldochitina striata</i></i><br />Uuga Cliff 1, Parki peninsula, 0.76 m, Lasnamägi Stage ( 590-24) <i><i>Pterochitina retracta</i></i><br />Uuga Cliff 1, Parki peninsula, 0.14 m, Lasnamägi Stage ( 590-8) <i><i>Pterochitina retracta</i></i><br />Uuga Cliff 1, Parki peninsula, 1.90 m, Lasnamägi Stage ( 590-9) <i><i>Rhabdochitina magna</i></i><br />Uuga Cliff 1, Parki peninsula, 5.04 m, Uhaku Stage ( 590-22)