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Nestor, H. & Nestor, V., 2002a

Nestor, H., Nestor, V. 2002. Upper Llandovery to middle Wenlock (Silurian) lithostratigraphy and chitinozoan biostratigraphy in southwestern Estonia and northermost Latvia. Proceedings of the Estonian Academy of Sciences. Geology 51 (2), 67-87. PDF | DOI | DETAILS

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ReferenceNestor, H. & Nestor, V., 2002a
AuthorNestor, H., Nestor, V.
TitleUpper Llandovery to middle Wenlock (Silurian) lithostratigraphy and chitinozoan biostratigraphy in southwestern Estonia and northermost Latvia
JournalProceedings of the Estonian Academy of Sciences. Geology
Source typearticle in journal
Remarks2 fototahvlit

The lithostratigraphy and chitinozoan biostratigraphy of the Adavere, Jaani, and Jaagarahu regional stages (upper Llandovery to middle Wenlock) in the Ikla (Estonia) and Staicelc (Latvia) drill cores were studied. Most of the upper Aeronian to lower Homerian local chitinozoan biozones are represented in these cores, except Interzone III, Angochitina longicollis, Conochitina proboscifera, and Margachitina margaritana biozones, partly corresponding to barren red beds of the Velise Formation, partly to a stratigraphical gap at the Llandovery-Wenlock transition. The presence of Stricklandia laevis shows that the Rumba Formation of the Adavere Stage belongs to the Telychian. The succeeding, Velise Formation has a reduced thickness and is represented only by its lower portion. Three stratigraphical gaps were established at the boundaries of the regional stages. The hiatuses at the junctions of the Raikküla-Adavere and Adavere-Jaani stages have a considerable areal extent and stratigraphical range. Probably, they reflect global glacio-eustatic falls of sea level at the end of the Aeronian and Telychian corresponding to the glaciations in South America. A gap at the base of the Jaagarahu Stage was recognized only in the Ikla core and has local significance

Sections studied or mentioned

Häädemeeste 172 borehole1,4
Ikla borehole1,3
Ristiküla 174 borehole1,4
Staicele 4 borehole701,2,4329.5-235m Saarde Formation-Jamaja Formation


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<i><i>Eisenackitina dolioliformis</i> | ?Eisenackitina dolioliformis Umnova, 1976</i><br />Staicele 4 borehole, 295.00 m, Adavere Stage ( 350-8) <i><i>Ancyrochitina paulaspina</i></i><br />Staicele 4 borehole, 270.10 m, Jaani Stage ( 350-18) <i><i>Ancyrochitina rumbaensis</i></i><br />Ikla borehole, 307.80 m, Adavere Stage ( 350-6) <i><i>Bursachitina</i> | Bursachitina sp. 2 Nestor et Nestor, 2002</i><br />Staicele 4 borehole, 247.80 m, Jaagarahu Stage ( 350-22) <i><i>Cingulochitina baltica</i></i><br />Staicele 4 borehole, 246.40 m, Jaagarahu Stage ( 350-25) <i><i>Cingulochitina cingulata</i></i><br />Staicele 4 borehole, 266.20 m, Jaagarahu Stage ( 350-20) <i><i>Cingulochitina crassa</i></i><br />Staicele 4 borehole, 252.30 m, Jaagarahu Stage ( 350-24) <i><i>Conochitina acuminata</i></i><br />Ikla borehole, 234.00 m, Jaagarahu Stage ( 350-26) <i><i>Conochitina</i> | Conochitina aff. armillata Taugourdeau et de Jekhowsky, 1960</i><br />Staicele 4 borehole, 274.50 m, Jaani Stage ( 350-19) <i><i>Conochitina alargada</i></i><br />Staicele 4 borehole, 321.00 m, Adavere Stage ( 350-1) <i><i>Conochitina</i> | Conochitina cf. argillophila Laufeld, 1974</i><br />Staicele 4 borehole, 253.30 m, Jaagarahu Stage ( 350-21) <i><i>Conochitina claviformis</i></i><br />Staicele 4 borehole, 288.50 m, Jaani Stage ( 350-14) <i><i>Conochitina cribrosa</i></i><br />Ikla borehole, 202.60 m, Jaagarahu Stage ( 350-31) <i><i>Conochitina fortis</i></i><br />Ikla borehole, 229.70 m, Jaagarahu Stage ( 350-30) <i><i>Conochitina iklaensis</i></i><br />Ikla borehole, 320.00 m, Adavere Stage ( 350-2) <i><i>Conochitina leptosoma</i></i><br />Staicele 4 borehole, 280.30 m, Jaani Stage ( 350-16) <i><i>Conochitina linearistriata</i></i><br />Ikla borehole, 209.50 m, Jaagarahu Stage ( 350-32) <i><i>Conochitina malleus</i> | Conochitina malleus (nomen nudum) Van Grootel, 1990</i><br />Staicele 4 borehole, 320.00 m, Raikküla Stage ( 350-3) <i><i>Conochitina mamilla</i></i><br />Staicele 4 borehole, 288.50 m, Jaani Stage ( 350-15) <i><i>Conochitina pachycephala</i></i><br />Ikla borehole, 234.00 m, Jaagarahu Stage ( 350-27) <i><i>Conochitina pachycephala</i></i><br />Ikla borehole, 229.70 m, Jaagarahu Stage ( 350-28) <i><i>Conochitina praeproboscifera</i></i><br />Staicele 4 borehole, 298.20 m, Adavere Stage ( 350-5) <i><i>Conochitina proboscifera</i></i><br />Ikla borehole, 287.50 m, Jaani Stage ( 350-12) <i><i>Conochitina subcyatha</i></i><br />Ikla borehole, 225.00 m, Jaagarahu Stage ( 350-29) <i><i>Conochitina tuba</i></i><br />Staicele 4 borehole, 274.50 m, Jaani Stage ( 350-17) <i><i>Chitinozoa</i> | Cyathochitina cf. campanulaeformis (Eisenack, 1931)</i><br />Ikla borehole, 310.60 m, Adavere Stage ( 350-4) <i><i>Eisenackitina causiata</i></i><br />Ikla borehole, 294.00 m, Jaani Stage ( 350-9) <i><i>Eisenackitina</i> | Eisenackitina sp.</i><br />Ikla borehole, 294.00 m, Jaani Stage ( 350-10) <i><i>Eisenackitina spongiosa</i></i><br />Staicele 4 borehole, 249.00 m, Jaagarahu Stage ( 350-23) <i><i>Margachitina margaritana</i></i><br />Staicele 4 borehole, 288.50 m, Jaani Stage ( 350-11) <i><i>Plectochitina pachyderma</i></i><br />Staicele 4 borehole, 256.40 m, Jaagarahu Stage ( 350-13) <i><i>Ramochitina</i> | Ramochitina sp.</i><br />Staicele 4 borehole, 296.00 m, Adavere Stage ( 350-7)