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Wyszukujesz frazę "acritarcha" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Late Proterozoic to Early Palaeozoic platform deposits of Southern Moravia (Czech Republic)
Autorzy:
Mikuláš, R.
Gilíková, H.
Vavrdová M.
Powiązania:
https://bibliotekanauki.pl/articles/2059091.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Brunovistulicum
Cambrian
facies analysis
ichnology
acritarcha
Opis:
Integrated sedimentological and palaeontological study of borehole cores through plat orm siliciclastic deposits of the southernmost part of Brunovistulicum (S Moravia) shows convincing evidence for the Cambrian age of a considerable portion organic-walled microfossils of Late Proterozoic (Ediacaran) age have been found in a sample from the Menín-1 borehole. Thirty genera characteristic of the Ediacaran have been recognized. Part, though, of the siliciclastic succession of S Brunovistulicum is Devonian in age. The platform deposits studied are consid red to have the same source area but the degree of maturity of the Devonian clastics rocks is generally higher than that of the older strata. Facies analysis indicates a predominance of deltaic settings (braided and fan del tas); similar sedimentary environments are suggested for both the Ediacaran/Cambrian and Devonian successions.
Źródło:
Geological Quarterly; 2008, 52, 4; 335-335
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The oldest rocks of the Holy Cross Mountains, Poland – biostratigraphy of the Cambrian Czarna Shale Formation in the vicinity of Kotuszów
Autorzy:
Szczepanik, Z.
Żylińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/138942.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cambrian
Fortunian
Terreneuvian
Holy Cross Mountains
Kotuszów
acritarcha
biostratigraphy
kambr
fortun
terenew
Góry Świętokrzyskie
Acritarcha
biostratygrafia
Opis:
Three lower Cambrian acritarch assemblages recognized in four outcrops in the vicinity of Kotuszów in the southernmost part of the Palaeozoic inlier of the Holy Cross Mountains span a stratigraphic interval from the uppermost part of the Asteridium tornatum–Comasphaeridium velvetum Assemblage Zone to the Skiagia ornata–Fimbriaglomerella membranacea Assemblage Zone (most probably its lower part). According to current views (Moczydłowska and Yin 2012), this interval corresponds to the upper part of the Fortunian and to Stage 2 of the Terreneuvian Series. The strata yielding the oldest assemblage are thus the oldest precisely documented rocks in the Palaeozoic succession of the Holy Cross Mountains, and the oldest Cambrian rocks exposed on the surface in Poland. The current biostratigraphic scheme for the pre-trilobitic part of the Cambrian System in the Holy Cross Mountains should be modified so that it is based on local acritarch interval subzones.
Źródło:
Acta Geologica Polonica; 2016, 66, 3; 267-280
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terreneuvian acritarch assemblages of the Holy Cross Mountains : a new approach
Autorzy:
Szczepanik, Zbigniew
Żylińska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2059610.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Cambrian
Terreneuvian
Holy Cross Mountains
Kotuszów
Acritarcha
biostratigraphy
Opis:
Rock samples from four boreholes and three exposures located in the southern peripheries of the Holy Cross Mountains in Poland, from strata representing the lower Cambrian Czarna Shale Formation have been studied palynologically. A relatively numerous and well-preserved lowermost Cambrian microfloral assemblage corresponds to coeval associations known from different palaeocontinents. Our new data enables reinterpretation of the biostratigraphy of the Czarna Formation, a thick rock unit basically devoid of macrofossils. The rocks analysed represent the Terreneuvian and comparison with other lower Cambrian successions indicates the middle and upper part of this oldest Cambrian series. The discovery of Variosphaeridium gen. nov. supplements information about the diversity of lowermost Cambrian microfloral assemblages. The Fimbriaglomerella membranacea–Globosphaeridium cerinum Assemblage Zone is introduced; it has a transitional character between the Asteridium tornatum–Comasphaeridium velvetum and Skiagia ornata–Fimbriaglomerella membranacea assemblage zones distinguished by Moczydłowska (1991) and identified on most Cambrian palaeocontinents.
Źródło:
Geological Quarterly; 2021, 65, 2; 65: 29
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Cambrian acritarch Lusatia: Taxonomy, palaeogeography, and biostratigraphic implications
Autorzy:
Albani, R.
Bagnoli, G.
Ribecai, C.
Raevskaya, E.
Powiązania:
https://bibliotekanauki.pl/articles/21158.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Acritarcha
Cambrian
Furongian
Late Cambrian
Lusatia
acritarch
biostratigraphy
marine phytoplankton
paleogeography
paleontology
taxonomy
phytoplankton
systematics
distribution
Opis:
Intraspecific variability of the herein emended diacrodian acritarch Lusatia dendroidea is described based on late Cambrian (Furongian) well preserved material from Spain, the High Arctic of Russia, and the East−European Platform. L. dendroidea, displays bipolar asymmetric morphology and, as originally defined, consists of three long major processes originating from the “corners” of its vesicle. Specimens with one, two and four major processes are considered to represent morphological variations of the most common three process form. Based on its narrow stratigraphic range, widespread palaeogeographic distribution, and distinctive morphology, L. dendroidea is an excellent guide fossil for the Furongian.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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