Results 11 to 20 of about 3,539 (164)
The Depositional RecordEstablishing the biogenicity of sedimentary surface textures with unresolved microbial origin is critical to any environmental and geobiological interpretation of clastic settings.
J. Javier Álvaro +5 more
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The evolution of reproduction in Ediacaran-Cambrian metazoans. [PDF]
Biol Rev Camb Philos SocABSTRACT The evolution of reproductive style is a fundamental aspect of metazoan life history but has not been explored holistically through the Ediacaran–Cambrian rise of metazoans. Recent molecular clock analyses based on only unequivocal metazoan fossil calibrations suggest that Porifera were present by at least 590 million years ago (Ma), all major
Wood RA, Droser ML.
europepmc +2 more sources
Biostratigraphy and palaeoecology of marine microphytoplankton cysts from Member 4 of the Mila Formation, Mila Kuh, eastern Alborz [PDF]
Journal of Stratigraphy and Sedimentology Researches, 2019 Well preserved and diverse organic-walled marine microphytoplankton cysts (acritarchs sensu lato) occur in Member 4 (comprising mostly of fine-grained clastics with thin carbonate intercalations) of the Mila Formation at the type section, southwestern ...
Navid Navidi-Izad, Hossein Hashemi
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An effective palynological preparation procedure using hydrogen peroxide [PDF]
, 2007 Most pre-Quaternary palynology samples are currently prepared by demineralization of the sediment/sedimentary rock matrix using hydrochloric and hydrofluoric acids (HCl and HF respectively).
Kyffin-Hughes, Jane E. +2 more
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Microfossils in the Ordovician erratic boulders from Southwestern Finland [PDF]
Bulletin of the Geological Society of Finland, 1995 Chitinozoans, ostracods and acritarchs found in four glacially transported limestone boulders from the south-western coast of Finland have been studied in order to test the usefulness of these microfossil groups in age determinations. Also rare specimens
J. Nõlvak, T. Meidla, A. Uutela
doaj +1 more source
Acta Societatis Botanicorum Poloniae, 2022 All the palynological studies of the Polish Paleozoic were conducted during the last 100 years. The investigations regarded the oldest microflora remains, acritarchs reaching up to Precambrian, and spores, and pollen grains which appeared later. The main
Maria Barbacka, Grzegorz Pacyna
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The stratigraphy, correlation, provenance and palaeogeography of the Skiddaw Group (Ordovician) in the English Lake District [PDF]
, 1995 A new lithostratigraphy is presented for the Skiddaw Group (lower Ordovician) of the English Lake District. Two stratigraphical belts are described. Five formations are defined in the Northern Fells Belt, ranging in age from Tremadoc to early Llanvirn.
Cooper, A.H. +5 more
core +1 more source
Estudios Geologicos, 2019 An updated stratigraphic subdivision of the Ediacaran and Terreneuvian in the Alcudia valley and the Toledo Mountains, Central Iberian Zone, is documented here.
J. J. Álvaro +4 more
doaj +1 more source
Small carbonaceous fossils (SCFs) from the Terreneuvian (lower Cambrian) of Baltica [PDF]
, 2018 We describe a new assemblage of small carbonaceous fossils (SCFs) from diagenetically 9 minimally altered clays and siltstones of Terreneuvian age from the Lontova and Voosi formations of 10 Estonia, Lithuania and Russia.
Butterfield, Nicholas +2 more
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Palynomorphs from abra límite, zenta range, Eastern Cordillera, Northwestern Argentina [PDF]
, 2010 This study presents the first Devonian palynological record in the Zenta Range in Eastern Cordillera, Argentina. Two associations were recognized on the basis of differences in palynomorphs and palynofacies.
Di Pasquo Lartigue, Maria +1 more
core +1 more source