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- W1995587617 abstract "An attempt is made to use palynomorphs to correlate the Ludlovian-Downtonian and the Silurian-Devonian boudaries in successions from the British Isles, Estonia, Podolia and north Africa. Miospores are found to be of most use for this purpose: (a) the micronatus-newportensis zone can be recognised in the Anglo-Welsh area, in Podolia and in north Africa, and the base of this zone indicates a level above, but close to, the Silurian-Devonian boundary; (b) the Ludlovian-Downtonian boundary is well-defined in the Anglo-Welsh area on the basis of miospores and can be determined approximately in north Africa and Estonia since several miospore species appear at or close to this boundary. The lack of stratigraphically important acritarch and miospore species in the Silurian-Devonian stratotype at Klonk (Czechoslovakia) underlines the importance of the Podolian sequence for the recognition of the Silurian-Devonian boundary in continental sequences. Recognition of the Ludlovian-Downtonian boundary in Podolia is difficult since the miospores below the Borschov Horizon have not been systematically described and are probably rare. Further, there are difficulties in using acritarchs for interregional correlation since they appear to be considerably influenced by provinciality and local environmental factors. From the palynological point of view therefore the Ludlovian-Downtonian boundary should be chosen from a sequence in which miospores are common, since one based on acritarchs would involve two stratotypes, one from the Deunffia-Domasia, and one from the carminae, realms. Finally, some features of current palinspastic continental plate reconstructions are discussed in the light of acritarch provinciality." @default.
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- W1995587617 date "1981-09-01" @default.
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- W1995587617 title "Acritarchs, miospores and correlation of the Ludlovian-Downtonian and Silurian-Devonian boundaries" @default.
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- W1995587617 doi "https://doi.org/10.1016/0034-6667(81)90039-7" @default.
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