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Palynomorph assemblages from the Upper Ordovician in northern and central

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Stempień-Sałek M.

Annales Societatis Geologorum Poloniae

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2011

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tom Vol. 81, No 1

21-61

EN

Palynological studies have been done to compare the Upper Ordovician strata in various geological units of northern and central Poland (epi-Caledonian Platform, East European Platform, Małopolska Block and Holy Cross Mountains–Łysogóry Fold Zone and Kielce Fold Zone). Two distinct palynological assemblages have been distinguished in the studied material: the Caradoc assemblage I and the Ashgill assemblage II (with two sub-assemblages IIa and IIb), thus demonstrating usefulness of the Upper Ordovician palynomorphs for biostrati- graphy. Thermal maturity of organic matter was studied using the TAI method. The palynological analysis, palynostratigraphy, and estimates of thermal maturity were done with the aim at palynological characterization of three ancient units: the Avalonia, Baltica and the Małopolska Block, all now participating in structures of the present-day geological units of northern and central Poland.

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Miospore taxonomy and stratigraphy of Upper Devonian and lowersmost Carboniferous in Western Pomerania (NW Poland)

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Stempień-Sałek M.

Annales Societatis Geologorum Poloniae

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2002

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tom Vol. 72, No 2

163-190

EN

Five local miospore zones, six subzones and two assemblages are distinguished for the Frasnian to lower Tournaisian deposits in the Kołobrzeg region (western Pomerania): assemblage I, Membrabaculisporis radiatus-Tholisporites densus (RD), Membrabaculisporis radiatus-Cymbosporites boafeticus (RB), Lagenoisporites immensus-Diducites poljessicus (IP) Zone, assemblage II, Tumulispora rarituberculata (Ra) and Convolutispora major (Ma) Zone. The first three biozones and the two assemblages are new in this region. The local miospores zones distinguished in western Pomerania are correlated with the European standard miospore and conodont zonations. Two new miospore species and one new variety are described, two species is emended.

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Past Polish contribution in the Paleozoic palynology

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Oliwkiewicz-Miklasińska M. , Stempień-Sałek M.

Geological Quarterly

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2011

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tom Vol. 55, No. 2

81-84

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New data on the stratigraphy of the Ordovician at Pobroszyn, Holy Cross Mts., Central Poland

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Bednarczyk W. , Stempień-Sałek M.

Acta Geologica Polonica

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2011

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tom Vol. 61, no. 1

47-58

EN

New biostratigraphic and lithostratigraphic data are presented for the tectonically reduced Ordovician succession at Pobroszyn in the Łysogóry region of the Holy Cross Mountains, central Poland. Only some of the chronostratigraphic units known from the Łysogóry region can be recognized in this section. However, based on lingulate brachiopods, conodonts, acritarchs and chitinozoa, the units present may be referred to the Late Tremadoc, Late Arenig, Early Lanvirn, Late Lanvirn, Early Caradoc and to the Middle Caradoc and Ashgill. New lithostratigraphic units are established in the lower part of the Ordovician of the Pobroszyn section: the Opatówka Mudstone/Sandstone Formation (?Late Tremadoc) and the Pobroszyn Sandstone Formation (Late Arenig). Three species of lingulate brachiopods are described, of which two are new: Myotreta anitae and Eoconulus lilianae. The conodonts and acritarchs are illustrated and briefly discussed.

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Ordovician–Silurian boundary in the Bardo Syncline, Holy Cross Mountains, Poland—new data on fossil assemblages and sedimentary succession

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Masiak M. , Podhalańska T. , Stempień-Sałek M.

Geological Quarterly

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2003

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tom Vol. 47, No 4

311-–330

EN

A gradual transition from sandy through silty to clayey strata occurs near the Ordovician–Silurian (O/S) boundary in the southern part of Holy Cross Mountains, in the Bardo Syncline. Three graptolite biozones are distinguished for the O/S boundary interval deposits: ?persculptus, ascensus-acuminatus and vesiculosus. The first, rare graptolites appear below “graptolitic shales” in the ?persculptus Biozone. The diversity of the assemblage increases in the next two biozones. An analysis of acritarch frequency shows a decrease of acritarch frequency at the O/S boundary and then a gradual increase in the lower part of the ascensus-acuminatus biozone with a maximum in the vesiculosus Biozone. The taxonomic diversity of the acritarch assemblage shows a similar trend although the maximum of acritarch frequency observed in the vesiculosus Biozone do not coincide the maximum of acritarch taxonomic diversity.

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Chitinozoans and acritarchs from the Ordovician of the Skibno 1 borehole, Pomerania, Poland : implications for stratigraphy and palaeography

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Wrona R. , Bednarczyk W. , Stempień-Sałek M.

Acta Geologica Polonica

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2001

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tom Vol. 51, nr 4

317-331

EN

Biostratographical results of this palynological study agree with those of previous research on graptolites from the Ordovician of the Skibno 1 borehole in the Koszalin - Chojnice Structural Zone, Polish portion of the Pomerania Terrane. They indicate that the investigated core interval can be attributed to the uppermost Llanvirn (Landeilo) - lower Caradoc, and correspond to the teretiusculus and gracilis through the multidens graptolite biozones. Recovered chitinozoan species, including Belonechitina robusta, Conochitina chydaea, C. dolosa, Lagenochitina aff. capax, Spinachitina bulmani, and the index species Laufeldochitina stentor are restricted to the upper Llanvirn - lower Caradoc, the latter species delimits the stentor chitinozoan biozone (upper Uhaku and Kukruse stages). The following identified acritarchs are regarded as biosratigraphically significant: Goniosphaeridium splendens, Ordovicidum elegantulum, O. heteromorphicum, O. nanofurcatum, O. nudum, and are characteristic for the Caradoc. The presence of conodont Scabbardella altipes and ichnofossil Alcyonidiopsis pharmaceus, both characteristic of high palaeolatitudes, as well as lithological similarities between the investigated strata and their equivalents from Rugen indicate that Pomerania could have been situated at relatively high latitudes during the upper Llanvirn to lower Caradoc. These observations together with palynological results support a hypothesis that Pomerania was a terrane derived from Avalonia and accreted to the margin of the East European Craton.