نتایج جستجو برای: visean
تعداد نتایج: 87 فیلتر نتایج به سال:
A sample of late Visean limestone from the Wlodawa IG-4 borehole, east Lublin, Poland, yielded a piece tooth and few hundred well-preserved scales comparable to those “Ctenacanthus” costellatus Traquair, 1884 Glencartholm, Scotland, UK. Most are typical compound body ctenacanthid type. Their crowns composed several separate odontodes whose distal ends turned backwards bases characterised by con...
New megafossil and microfossil data indicate four episodes in the diversification of Silurian-Early Carboniferous land plants of South China, a relatively continuous regional record. Plant diversity increased throughout, but the rising curve was punctuated by three major falls. There were peaks of origination in the Ludlow-Pragian, Givetian, late Famennian and Visean and peaks of extinction in ...
Squaloraja is a genus of chimaeriform fishes known from the Early Jurassic. It has dorsoventrally flattened body and long median rostral cartilage. Males have lance-like tenaculum that articulates with central groove on dorsal face The only member family Squalorajidae, itself in suborder Squalorajoidei order Chimaeriformes. Phylogenetic analyses suggest divergence other Chimaeriformes Mississip...
Abstract The geomagnetic polarity pattern for the Carboniferous is incompletely known with best-resolved parts in Serpukhovian and Bashkirian. Hence, data from both igneous sedimentary units are also used an additional bias evaluation. In Tournaisian to mid Visean interval mainly derived palaeopole-type palaeomagnetic studies, allowing identification of chrons. Seven chrons exist Mississippian ...
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