Results 11 to 20 of about 3,600 (212)
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
doaj +2 more sources
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
The Ordovician acritarch genus Coryphidium [PDF]
Revue de Micropaléontologie, 2008 The acritarch genus Coryphidium Vavrdova, 1972 is one of the most frequently recorded acritarch taxa in the Ordovician. The original diagnoses, stratigraphical ranges and geographical distribution of all Coryphidium species are critically evaluated in a review of published literature supplemented by studies of material from the British Isles, Belgium ...
Servais T +3 more
openaire +3 more sources
A latest Cretaceous to earliest Paleogene dinoflagellate cyst zonation of Antarctica, and implications for phytoprovincialism in the high southern latitudes [PDF]
, 2012 The thickest uppermost Cretaceous to lowermost Paleogene (Maastrichtian to Danian) sedimentary succession in the world is exposed on southern Seymour Island (65° South) in the James Ross Basin, Antarctic Peninsula.
Bowman, Vanessa C. +4 more
core +1 more source
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
doaj +1 more source
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
core +2 more sources
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
core +2 more sources