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Wyświetlanie 1-3 z 3
Tytuł:
Eratyki przewodnie w glinach morenowych Polski
Fennoscandian indicator erratics in glacial tills of Poland
Autorzy:
Czubla, P.
Gałązka, D.
Górska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2074440.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
plejstocen
litostratygrafia
eratyk przewodni
osad glacjalny
indicator erratics
glacial deposit
Pleistocene
lithostratigraphy
Polska
Opis:
Erratics analysis is one of the principal methods used to study glacial sediments. Usually, simplified petrography of gravel fraction is employed, whereas more advanced techniques, based on interpreting certain rock types of Fennoscandian provenience, are still rarely used in Poland. This is mainly due to the lack of training in classifying erratic rocks, what in turn is at least partly a consequence of the lack of appropriate Polish language atlases. We are willing to bridge this gap, presenting the 33 descriptions of the indicator rock types found in the Pleistocene sediments in Poland. Most descriptions have been illustrated with colour photographs, showing either the specimens from Poland, or the ones collected during our expeditions to Sweden, Denmark and Finland.We present the most important features, which allow to both identify a sample unambiguously and to tie it to a specific outcrop in Fennoscandia. Additionally, we include the geographic coordinates of the central points of source outcrops, used to define the theoretical pebble centres position (Lüttig 1958).
Źródło:
Przegląd Geologiczny; 2006, 54, 4; 352-362
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eratyki przewodnie w glinach morenowych Polski
Fennoscandian indicator erratics in glacial tills of Poland
Autorzy:
Czubla, P.
Gałązka, D.
Górska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2074467.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
skała narzutowa
eratyk
osad polodowcowy
plejstocen
indicator erratics
glacial deposit
Pleistocene
lithostratigraphy
Polska
Opis:
Erratics analysis is one of the principal methods used to study glacial sediments. Usually, simplified petrography of gravel fraction is employed, whereas more advanced techniques, based on interpreting certain rock types of Fennoscandian provenience, are still rarely used in Poland. This is mainly due to the lack of training in classifying erratic rocks, what in turn is at least partly a consequence of the lack of appropriate Polish language atlases. We are willing to bridge this gap, presenting the 33 descriptions of the indicator rock types found in the Pleistocene sediments in Poland. Most descriptions have been illustrated with colour photographs, showing either the specimens from Poland, or the ones collected during our expeditions to Sweden, Denmark and Finland.We present the most important features, which allow to both identify a sample unambiguously and to tie it to a specific outcrop in Fennoscandia. Additionally, we include the geographic coordinates of the central points of source outcrops, used to define the theoretical pebble centres position
Źródło:
Przegląd Geologiczny; 2006, 54, 3; 245-255
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The erratic rocks of the Upper Cretaceous Chalk of England: how did they get there, ice transport or other means?
Autorzy:
Jeans, Christopher V.
Platten, Ian M.
Powiązania:
https://bibliotekanauki.pl/articles/1835594.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cretaceous
chalk
erratics
gastroliths
fast ice
palaeogeography
NW Europe
kreda
eratyk
stały lód brzegowy
paleogeografia
Europa północno-zachodnia
Opis:
Rare erratic clasts - extraneous rock types - occur in the Upper Cretaceous Chalk, including a local basal facies, the Cambridge Greensand. The underlying Upper Albian Gault Clay and the Hunstanton Red Chalk Formations have also yielded erratics. The discovery of these erratics, their description and the development of hypotheses to explain their origins and significance are reviewed. They became the subject of scientific interest with the interpretation of a particularly large example “The Purley Boulder” by Godwin-Austen (1858) as having been transported to its depositional site in the Chalk Sea by drifting coastal ice. Thin section petrography (1930–1951) extended knowledge of their diverse provenance. At the same time the Chalk Sea had become interpreted as warm, so drifting ice was considered out of context, and the preferred agents of transport were entanglement in the roots of drifting trees, as holdfasts of floating marine algae, or as stomach stones of marine reptiles or large fish. Reconsideration of their occurrence, variable nature and sedimentary setting suggests that there are three zones in the English Chalk where erratics may be less rare (1) near the base of the Cenomanian in the Cambridge area, (2) the Upper Cenomanian-Middle Turonian in Surrey, and (3) the Upper Coniacian and Lower Santonian of Kent. The assemblage from each level and their sedimentary setting is subtly different. Present evidence suggests that the erratics found in the Upper Albian-Lower Cenomanian and the Upper Cenomanian-Middle Turonian zones represent shallow water and shoreline rocks that were transported into the Chalk Sea by coastal ice (fast-ice) that enclosed coastal marine sediments as it froze. The Upper Coniacian and Lower Santonian erratics from Rochester and Gravesend in Kent are gastroliths.
Źródło:
Acta Geologica Polonica; 2021, 71, 3; 287-304
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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