Results 1 to 10 of about 171 (156)
Dynamics of Silurian Plants as Response to Climate Changes [PDF]
Life, 2021 The most ancient macroscopic plants fossils are Early Silurian cooksonioid sporophytes from the volcanic islands of the peri-Gondwanan palaeoregion (the Barrandian area, Prague Basin, Czech Republic).
Josef Pšenička +5 more
doaj +2 more sources
Palaeogeographic implications of a new iocrinid crinoid (Disparida) from the Ordovician (Darriwillian) of Morocco [PDF]
PeerJ, 2015 Complete, articulated crinoids from the Ordovician peri-Gondwanan margin are rare. Here, we describe a new species, Iocrinus africanus sp. nov., from the Darriwilian-age Taddrist Formation of Morocco.
Samuel Zamora +2 more
doaj +3 more sources
A peri-Gondwanan arc in NW IberiaI: Isotopic and geochemical constraints on the origin of the arc—A sedimentary approach [PDF]
Gondwana Research, 2010 The arc-derived upper terrane in the NW Iberia Variscan belt contains a 3000 m thick turbiditic formation at its structural top. Most of the sandstones are feldspathic greywackes with a framework of quartz and weakly altered plagioclase. Rock fragments of vitric and microgranular texture are common in polymictic conglomerates and coarse-grained ...
Pedro Castiñeiras +2 more
exaly +3 more sources
About a peri-Gondwanan-North African enlarged acceptance of the Caledonian Orogeny
Studia Universitatis Babes-Bolyai, Geologia, 2011 The notion of "Caledonian Orogeny" is restricted by most authors to the Ordovician-Devonian thermotectonic events that are associated with the Laurentia-Baltica-Avalonia suturing. However, some views consider an orogeny as the sum of tectonic, metamorphic, and magmatic events accompanying an entire supercontinent assembly or Wilson cycle.
Constantin Balica, Ioan Balintoni
exaly +4 more sources
Frontiers in Ecology and EvolutionAs we continue to explore the early evolution of the Eumetazoa, important evidence is coming from the oldest Ediacaran biotas of Avalonia. Fundamental to understanding the ecology an evolution of the earliest soft-bodied complex animals is an ...
Duncan McIlroy
doaj +2 more sources
60 years of the Serbo-Macedonian Unit concept: From Cadomian towards alpine tectonic frameworks [PDF]
Geološki Anali Balkanskoga Poluostrva, 2020 The study represents a summary of the hitherto tectonic concepts revolving around a peri-Gondwanan fragment referred to as the Serbo- Macedonian Unit. The Serbo-Macedonian Unit as a gneiss-dominated basement segment is positioned in the proximity of the ...
Spahić Darko, Gaudenyi Tivadar
doaj +1 more source
Геодинамика и тектонофизика, 2023 U-Th-Pb isotope dating of grains of detrital zircon from quartzites of the Suvanyak metamorphic complex, which forms the Suvanyak tectonic unit that forms the western part of the Uraltau uplift, located in the east of the West Ural megazone in the ...
B. G. Golionko +7 more
doaj +1 more source
Geologica Acta, 2022 Despite the so-called exotic nature of the South Portuguese Zone relatively to the other major domains of the Iberian Massif of peri-Gondwanan affinity, Devonian detrital rocks of the oldest strata in the Iberian Pyrite Belt have a remarkable resemblance
João Lains Amaral +3 more
doaj +1 more source
Cadomian metabasites of the Eastern Pyrenees revisited
Geologica Acta, 2022 This study presents a new geochemical, petrological, and geochronological U–Pb dataset from Ediacaran metabasites of the Canigó and Cap de Creus massifs, Eastern Pyrenees.
Núria Pujol-Solà +7 more
doaj +1 more source
Geologica Acta, 2022 This work assessed the age distribution of Cadomian/Pan-African orogenic events (550-590 and 605-790Ma, respectively) in several zones of Iberian Massif by means of detrital and inherited zircon analysis compilation. Detrital zircon age spectra show that
Martim Chichorro +4 more
doaj +1 more source