Search Results

1 - 10 of 61 items :

Clear All
Vitrinite equivalent reflectance of Silurian black shales from the Holy Cross Mountains, Poland

. Kozłowski, W., Domańska-Siuda, J., & Nawrocki, J. (2014). Geochemistry and petrology of the Upper Silurian greywackes from the Holy Cross Mountains (central Poland): implications for the Caledonian history of the southern part of the Trans-European Suture Zone (TESZ). Geological Quarterly, 58 (2), 311-336. DOI: 10.7306/gq.1160. Malec, J. (2000). Wstępne dane o przeobrażeniach termicznych materii organicznej w szarogłazach górnego syluru Gór Świętokrzyskich. Posiedzenia Naukowe Państwowego Instytutu Geologicznego, 56 , 109-111. Malec, J. (2006). Sylur w

Open access
Plant Diversity of The Mid Silurian (Lower Wenlock, Sheinwoodian) Terrestrial Vegetation Preserved in Marine Sediments from The Barrandian Area, The Czech Republic

References Boyce, C. K. (2008): How green was Cooksonia? The importance of size in understanding the early evolution of physiology in the vascular plant lineage. - Paleobiology, 34: 179-194. https://doi.org/10.1666/0094-8373(2008)034[0179:HGWCTI]2.0.CO;2 Chlupáč, I. (1987): Ecostratigraphy of Silurian trilobite assemblages of the Barrandian area. - Newsletters on Stratigraphy, 17: 169-186. https://doi.org/10.1127/nos/17/1987/169 Chlupáč, I., Havlíček, V., Kukal, Z., Kříž, J., Štorch, P. (1998): Palaeozoic of the

Open access
The late Silurian–Middle Devonian long-term eustatic cycle as a possible control on the global generic diversity dynamics of bivalves and gastropods

fossil record and molecular phylogenetics. Palaeontology 50, 23-40. Blodgett, R.B., Rohr, D.M. & Boucot, A.J., 1990. Early and Middle Devonian gastropod biogeography. [In:] W.S. McKerrow & C.R. Scotese (Eds): Palaeozoic Palaeogeography and Biogeography . Geological Society Memoir 12, 277-284. Calner, M., 2005a. Silurian carbonate platforms and extinction events - ecosystem changes exemplified from Gotland, Sweden. Facies 51, 584-591. Calner, M., 2005b. A Late Silurian extinction event and anachronistic period

Open access
Graptolite turnover and δ13Corg excursion in the upper Wenlock shales (Silurian) of the Holy Cross Mountains (Poland)

References Bełka Z., Valverde-Vaquero P., Dörr W., Ahrendt H., Wemmer K., Franke W. & Schäfer J. 2002: Accretion of first Gondwana- derived terranes at the margin of Baltica. In: Winchester J.A., Pharaoh T.C. & Verniers J. (Eds.): Palaeozoic amalgamation of Central Europe. Geol. Soc. London, Spec. Publ. 201, 19–36. Bickert T., Pätzold J., Samtleben C. & Munnecke A. 1997: Paleoenvironmental changes in the Silurian indicated by stable isotopes in brachiopod shells from Gotland, Sweden. Geochim. Cosmochim. Acta 61, 2717–2730. Blain J.A., Ray D

Open access
Stratigraphic correlation potential of magnetic susceptibility and gamma-ray spectrometric variations in calciturbiditic facies (Silurian-Devonian boundary, Prague Synclinorium, Czech Republic)

References Bábek O., Přikryl T. & Hladil J. 2007: Progressive drowning of carbonate platform in the Moravo-Silesian Basin (Czech Republic) before the Frasnian/Famenian event: facies, compositional variations and gamma-ray spectrometry. Facies 53, 293-316. Brocke R., Wilde V., Fatka O. & Mann U. 2002: Chitinozoa and acritarchs at the Silurian/Devonian boundary: Examples from the Barrandian area. In: Brock G. A. & Talent J. (Eds.): 1 st International Palaeontological Congress. Abstracts , Sydney, 192

Open access
Do the Available Data Permit Clarifcation of the Possible Dependence of Palaeozoic Brachiopod Generic Diversity Dynamics on Global Sea-Level Changes? A Viewpoint

References Aldridge, R.J., Jeppson, L. & Dorning, K.J., 1993. Early Silurian oceanic episodes and events. Journal of the Geological Society, London 150, 501–513. Benton, M.J., Dunhill, A.M., Lloyd, G.T. & Marx, F.G., 2011. Assessing the quality of the fossil record: in sights from vertebrates. [In:] McGowan, A.J. & Smith, A.B. (Eds): Comparing the Geological and Fossil Records: Implications for Biodiversity Studies. Geological Society, London, Special Publications 358, 63–94. Birks, H.J.B., Lotter, A.F., Juggins, S. & Smol, J.P. (Eds), 2012

Open access
Palaeo-earthquake events during the late Early Palaeozoic in the central Tarim Basin (NW China): evidence from deep drilling cores

deformation of sediments. Chapman & Hall (London), 362 pp. Marco, S. & Agnon, A., 1995. Prehistoric earthquake deformations near Masada, Dead Sea graben. Geology 23, 695-698. McCalpin, J. (Ed.), 1996. Paleoseismology. Academic Press (New York), 382 pp. Miao, Q. & Fu, H., 2013. Sequence stratigraphy of the Silurian strata in the northern and central Tarim Basin. Sedimentary Geology and Tethyan Geology 33, 34-41 (in Chinese with English abstract). Mills, P.C., 1983. Genesis and diagnostic value of soft-sediment deformation structures - a review. Sedimentary

Open access
Schizocrania (Brachiopoda, Discinoidea): taxonomy, occurrence, ecology and history of the earliest epizoan lingulate brachiopod

References Barrett, S. T. (1878): Descriptions of new species of fossils from the Upper Silurian rocks of Port Jervis, N. Y., with notes on the occurrence of the Coralline Limestone at that locality. – Annals, New York Academy of Sciences 1(4): 121–124. Bassett, M. G. (1986): Brachiopodes inarticules. – In: Racheboeuf, P. R. (ed.), Le Groupe Liévin, Pridoli – Lochkovien de l’Artois (N. France). Biostratigraphie du Paléozoique, 3: 85–97. Bassett, M. G., Popov, L. E., Aldridge R. J., Gabbott, S. E., Theron, J. N. (2009): Brachiopoda from the Soom

Open access
The Kaali crater field and other geosites of Saaremaa Island (Estonia): the perspectives for a geopark

Kaali impact-site (Holocene, Estonia). Preliminary SEM investigation. Geochemical Journal 38, 211-219. Märss, T., Soesoo, A. & Nestor, H. (Compilers), 2007. Silurian cliffs on Saaremaa Island. Tallinn, MTÜ GEOGuide Baltoscandia, 32 pp. Meri, L., 1976. Hõbevalge [Silver white]. Tallinn, Eesti Raamat, 488 pp. Moora, T., Raukas, A. & Kestlane, Ü, 2008. Kaali meteoriidi peakraatri setetest [On deposits of the Kaali main crater]. [In:] Lang, V. (Ed.): Muinasaja teadus 17. Loodus, inimene ja

Open access
Origin of natural gases in the Paleozoic-Mesozoic basement of the Polish Carpathian Foredeep

Origin of natural gases in the Paleozoic-Mesozoic basement of the Polish Carpathian Foredeep

Hydrocarbon gases from Upper Devonian and Lower Carboniferous reservoirs in the Paleozoic basement of the Polish Carpathian Foredeep were generated mainly during low-temperature thermogenic processes ("oil window"). They contain only insignificant amounts of microbial methane and ethane. These gaseous hydrocarbons were generated from Lower Carboniferous and/or Middle Jurassic mixed Type III/II kerogen and from Ordovician-Silurian Type II kerogen, respectively. Methane, ethane and carbon dioxide of natural gas from the Middle Devonian reservoir contain a significant microbial component whereas their small thermogenic component is most probably genetically related to Ordovician-Silurian Type II kerogen. The gaseous hydrocarbons from the Upper Jurassic and the Upper Cretaceous reservoirs of the Mesozoic basement were generated both by microbial carbon dioxide reduction and thermogenic processes. The presence of microbial methane generated by carbon dioxide reduction suggests that in some deposits the traps had already been formed and sealed during the migration of microbial methane, presumably in the immature source rock environment. The traps were successively supplied with thermogenic methane and higher hydrocarbons generated at successively higher maturation stages of kerogen. The higher hydrocarbons of the majority of deposits were generated from mixed Type III/II kerogen deposited in the Middle Jurassic, Lower Carboniferous and/or Devonian strata. Type II or mixed Type II/III kerogen could be the source for hydrocarbons in both the Tarnów and Brzezówka deposits. In the Cenomanian sandstone reservoir of the Brzezowiec deposit and one Upper Jurassic carbonate block of the Lubaczów deposit microbial methane prevails. It migrated from the autochthonous Miocene strata.

Open access