Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: chitinozoans

Sortuj według:

Ogranicz wyniki do:

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

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

Acta Geologica Polonica

2001

Vol. 51, nr 4

317-331

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.

Chitinozoa-bearing Horizons in the Ordovican of Northern Poland in the Light of Conodont Stratigraphy

Bednarczyk W. S.

Bulletin of the Polish Academy of Sciences. Earth Sciences

1999

Vol. 47, nr 1

1-13

Some Caradiocian and Arenigian species of Chitinozoa have been previously described from the western part of the Baltic Syneclise (the Łeba area), and from the Holy Cross Mts and, lastly, from Pomerania. In the Sokolica 1 and in the Klewno 1 boreholes, situated in the Kętrzyn region (eastern part of the Baltic Syneclise), 14 species from 8 genera have been recorded from the Arenigian to the Lower Ashgillian strata. The Chitinozoa are compared with those from Scandinavian and Baltic (mainly Estonia) countries. The assemblages of Chitinazoa are presented against a background of Conodont stratigraphy.