Szczegóły publikacji
Opis bibliograficzny
The Eocene Hieroglyphic Beds of the Silesian Nappe in the Western Polish Carpathians - their development and foraminiferal record / Anna WAŚKOWSKA // Geological Quarterly ; ISSN 1641-7291. — 2015 — vol. 59 no. 2, s. 271–299. — Bibliogr. s. 293–299. — Publikacja dostępna online od: 2015-01-22
Autor
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 89757 |
|---|---|
| Data dodania do BaDAP | 2015-06-29 |
| Tekst źródłowy | URL |
| DOI | 10.7306/gq.1213 |
| Rok publikacji | 2015 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Geological Quarterly |
Abstract
The sedimentation of Hieroglyphic Beds of the Silesian Nappe took place from the Early Eocene up to Late Eocene within the Carpathian Silesian Basin. These beds are dominated by thin-bedded flysch containing - at various stratigraphic positions - thick sandstone-free complexes with variegated shales or bentonite laminae developed during a limited supply of material from the land. Their variability and boundary sequences are presented. In general, their lithological heterogeneity is connected by the ratio of sandstones and shales, thickness of layers and occurrence of different type of shales. The Hieroglyphic Beds are underlain by the Ciezkowice Sandstone or directly by the Istebna Beds and overlain by the Globigerina Marls or directly by the Menilite Beds. In the Ypresian, during the sedimentation of Hieroglyphic Beds, foraminiferal associations with numerous small-sized Trochammina developed in the Silesian Basin after the PETM crisis. Since the Lutetian, more diverse associations occurred in slightly more favourable conditions, with Reticulophragmium amplectens (Grzybowski), Dolgenia latus (Grzybowski), and Reticulophragmium gerochi Neagu et al., which preferred cool waters, and are index fossils for stratigraphy. The Hieroglyphic Beds developed during a period of gradually cooling global climate. The gradual decrease in temperature stimulated the transfer of species. The thermophilous forms, whose optimum development took place in the Late Cretaceous-Paleocene, disappear during Lower and Middle Eocene and new species that preferred cold boreal waters commonly occur in Middle and Late Ecocene. A profound restructuring of foraminiferal assemblages took place in the Priabonian, when massive numbers of calcareous benthic and planktonic forms were deposited.
