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Männik et al., 2014a

Männik, P., Põldvere, A., Nestor, V., Kallaste, T., Kiipli, T. & Martma, T. 2014. The Llandovery–Wenlock boundary interval in west-central continental Estonia: an example from the Suigu (S-3) core section. Estonian Journal of Earth Sciences 63 (1), 1-17. | PDF | DOI | DETAILS

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ID3601
ReferenceMännik et al., 2014a
AuthorMännik, P., Põldvere, A., Nestor, V., Kallaste, T., Kiipli, T. & Martma, T.
Year2014
TitleThe Llandovery–Wenlock boundary interval in west-central continental Estonia: an example from the Suigu (S-3) core section
JournalEstonian Journal of Earth Sciences
Volume63
Number1
pgs.1-17
Source typearticle in journal
LanguageEnglish
DOI10.3176/earth.2014.01
AbstractA gap corresponding to several conodont and chitinozoan zones occurs in the Llandovery–Wenlock boundary interval in some sections in the western coastal region of Estonia and on islands in the Muhu Strait. New data from the Suigu (S-3) core section demonstrate that the gap has geographically wider distribution in western continental Estonia. Detailed study of faunas from that section revealed that here the gap corresponds to at least four conodont zones (from below): the Lower and Upper Pseudooneotodus bicornis and Lower and Upper Pterospathodus pennatus procerus zones, but probably also the upper(most) Upper Pt. amorphognathoides amorphognathoides Subzone and the Lower Kockelella ranuliformis Zone (or part of it) are missing. In sense of chitinozoan biostratigraphy, the gap correlates with most of the Margachitina margaritana Zone. Only the uppermost part of this zone is represented in the section. However, although the gap in the Suigu (S-3) core section is distinct and well dated biostratigraphically, the d13C curve demonstrates no evidence of it. Causes of this controversy are still waiting to be revealed. Our data indicate that changes in sedimentation in the Llandovery–Wenlock boundary interval occurred earlier in the distal graptolite-bearing and later in the proximal environments. Most probably, sedimentation in the Baltic Palaeobasin in the late Telychian and early Sheinwoodian was strongly affected by tectonic evolution of the Baltoscandian foreland basin.

Sections studied or mentioned

Localitypgs.Figs.Remarks
Aispute 41 borehole7shown for comparison
Ohesaare borehole7shown for comparison
Paatsalu 527 borehole7shown for comparison
Suigu borehole1-17detailed description, conodonts, chitinozoans, geochemistry; 6.2-40.0 m
Viirelaid borehole7shown for comparison
Viki borehole7shown for comparison