Temat: Conchostraca - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Ambiguities in conchostracan biostratigraphy : a case study of the Permian–Triassic boundary
Autorzy:: Becker, A.
Powiązania:: https://bibliotekanauki.pl/articles/191734.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: Conchostraca
stratigraphy
Permian–Triassic boundary
Opis:: In recent years, conchostracan biostratigraphy has become a popular tool for the recognition of the Permian–Triassic boundary and for the chronostratigraphic subdivision of the Triassic in intracontinental settings, including also the bone-bearing Keuper strata of Poland. The ambiguous nature of the new bio-chronostratigraphic approach was characterized in a case study of the Permian–Triassic boundary interval. The most important problems were: (1) the lack of documentation of the index species, (2) the indirect correlation with the conodont stratigraphy in marine reference sections through the sporomorph spectra, (3) the lack of definition and documen- tation of supporting palynologic zones, and (4) difficulties in reliable taxonomic determination of Conchostraca. Testing and, if necessary, revision of the zonation by several independent research groups is suggested.
Źródło:: Annales Societatis Geologorum Poloniae; 2015, 85, 4; 697-701
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Pstry piaskowiec w Górach Świętokrzyskich: chronostratygrafia i korelacja litostratygraficzna z basenem turyńskim
Buntsandstein in the Holy Cross Mountains: chronostratigraphy and lithostratigraphical correlation with the Thuringian Basin
Autorzy:: Ptaszyński, T.
Niedźwiedzki, G.
Powiązania:: https://bibliotekanauki.pl/articles/2074457.pdf
Data publikacji:: 2006
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: cechsztyn
pstry piaskowiec
chronostratygrafia
litostratygrafia
korelacja litostratygraficzna
basen turyński
Buntsandstein
Zechstein
chronostratigraphy
lithostratigraphy
Holy Cross Mountains
Thuringian Basin
correlation
Conchostraca
Opis:: The study was performed to attempt the lithostratigraphic correlation of the Buntsandstein in the margin of Holy Cross Mountains region with that of the Thuringian Basin, and simultaneously, to clarify its position in the chronostratigraphic scheme, basing on biostratigraphic data (microflora, conchostracans), and on the existence of regional discordances. The authors found strong analogies with other Buntsandstein sections of the Europe. On the other hand, because of the position of the studied area within the marginal part of the Central European Basin, Buntsandstein of the Holy Cross Mountains region is developed in different facies, more fluvial, instead of lacustrine ones. The common presence of Conchostraca representing the same species as in other parts of the Central European Basin (Thuringia), enables possible the correlation of the investigated area with the Thuringian Basin, and helps to locate stratigraphic gaps and discordances. The authors found that the lower boundary of the Buntsandstein and the boundary between the Lower and Middle Buntsandstein in the Polish study area are not equivalents of those in other areas. Also note worthy is the presence at the margin of the Holy Cross Mountains of youngest Permian terrigenous deposits not connected with the Zechstein salinar sedimentation, included to date to Zechstein or to Buntsandstein. The key for understanding the lithostratigraphic scheme of the Buntsandstein of Holy Cross Mountains region is an assumption, that the Zagnańsk Formation is mostly of fluvial, instead of lacustrine origin, consisting of equivalents of the whole Lower Buntsandstein, and that of the lower Volpriehausen Formation of the Middle Buntsandstein, with the Volpriehausen discordance present within. Authors also assume, that at least in this case, differences in the marginal part of the sedimentary basin, in comparison with its central part, depend on the presence of fluvial facies instead of lacustrine ones, and onthe presence of sedimentary gaps and discordances whose duration is progressively longer towards the basin margin enlarges in the direction to the basin margin.
Źródło:: Przegląd Geologiczny; 2006, 54, 6; 525-533
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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