Biostratigraphy of the Carboniferous sediments from the Wierzchowo area (Western Pomerania)
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Abstract:
The stratigraphy and correlation is here given of Lower Carboniferous sediments encountered in 12 borehole· profiles in the Wierzchowo area (Western Pomerania). The presence of the Tournaisian ( TnIa-Tn3 ) and of the Lower Visean ( VI ) has been observed on faunal evidence.Keywords:
Viséan
Tournaisian
Lithostratigraphy
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Początek dewonskiej sedymentacji w polnocno-zachodniej Polsce: przeslanki palinologiczne
Palynomorph assemblages of low taxonomic diversity are recorded from the basal Devonian strata in three boreholes in western Pomerania and Kujawy. The palynoflora is assigned to a younger, autochtonous assemblage, and an older, redeposited one. The composition of the younger assemblage suggests lower to middle Eifelian. The older palynomorphs are derived from (1) Upper Ordovician or Lower Silurian, and (2) probably from Upper Silurian deposits.
Devonian
Assemblage (archaeology)
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Westphalian sovereignty
Coal measures
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A short review of the literature on the stratigraphy of the Devonian and the Lower Carboniferous of the Cantabrian Mountains precedes the report of the author's stratigraphic and palaeontologic observations in Leon: the Rio Esla area (Gedinnian to Visean), the central Cantabrian area (Famennian to Visean), and the Gildar-Monto area (Eifelian to Visean); in Asturias: the coastal area (Frasnian to Visean); in Palencia: the Arauz-Polentinos area (Gedinnian to Givetian), the Carda\u0148o-Triollo area (Eifelian to Visean), and the San Martin-Valsurvio area (Givetian and Famennian to Visean); and in Santander: the Liebana area (Eifelian to Visean). Most of the conodont faunas, which were extracted from calcareous formations, could be arranged in the zonal succession established in Germany, and thus supplied new data about several formations in the Cantabrian Mountains. The presence of the transgressive Ermita Formation in Asturias and Palencia is demonstrated. The age of this unit ranges maximally from uppermost Famennian to lowermost Tournaisian. The Carda\u0148o Formation ranges from middle or upper Givetian to upper Frasnian. The Vidrieros Formation ranges from the upper part of the lower Famennian to the lowermost Tournaisian. A synthesis of the stratigraphic data delimits the Palentine facies area, which is clearly separated from the Asturo-Leonese facies area by positive areas. The following palaeogeographic units are distinguished: the Asturo-Leonese Basin, the Palentine Basin, and the Asturian Geanticline. The development of these units from the Middle Devonian to the Lower Carboniferous is demonstrated by eight facies-pattern maps. The sedimentation on the Asturian Geanticline was limited and probably incomplete. An epeirogenetic uplift of this geanticline took place in late Frasnian to early Famennian times. This uplift is correlated with the deposition of the quartzitic Murcia Formation in the sheltered Palentine Basin. The uplifted area was covered by the Ermita transgression in the late Famennian to early Tournaisian. After a break in the sedimentation, a local transgression resulted in the Vegamian Formation in the upper Tournaisian. In most of the area the Alba transgression began in the uppermost Tournaisian or lower Visean. In the Palentine Basin the deposition of the Alba Formation started in the upper Visean. The chapter on systematics deals mainly with the most important zonal guide forms of the conodonts. Three new elements are described: Icriodus eslaensis n.sp. from the middle to upper Givetian, Siphonodella? n.sp. a, probably from the upper Tournaisian, and n.gen. A n.sp. a, a simple compound conodont from the upper Gedinnian or lower Siegenian.
Tournaisian
Viséan
Devonian
Diachronous
Conodont
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Tournaisian
Viséan
Devonian
Sequence (biology)
Late Devonian extinction
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Devonian
Western europe
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The Middle Member of the Zorritas Formation in the Antofagasta region of northern Chile, yielded terrestrial and marine palynomorph assemblages which span the Devonian/Carboniferous boundary. The assemblages show a clear predominance of terrestrial palynomorphs with 70 miospore species, 18 marine phytoplankton species, two non-marine algae and one chitinozoan species, all coming from 15 productive levels. Palynomorphs are poorly preserved and most of them are reworked. Three palynological associations are recognized based on miospores. These are assigned to the Tournaisian–Visean, Tournaisian and probable latest Famennian. Age assignments are discussed in the frame of the spore zonal schemes established for Euramerica and western Gondwana. The stratigraphical distribution of spores allows the identification of the probable position of the Devonian/Carboniferous boundary within the Zorritas Formation. This system boundary is proposed for the first time in Palaeozoic sedimentary rocks of northern Chile. The presence of Gondwanan typical miospore species indicates affinities with this palaeocontinent even though the Tournaisian and Tournaisian–Visean miospore associations support the cosmopolitanism already suggested for the early Carboniferous flora. The significant number of reworked palynomorphs together with the sedimentological analysis of the studied sections, suggest that these deposits were severely impacted by the climatic change and major sea level fluctuations. Similar conditions were recorded in coeval western Gondwana basins.
Tournaisian
Viséan
Devonian
Late Devonian extinction
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Tournaisian
Outcrop
Devonian
Viséan
Late Devonian extinction
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Tournaisian
Westphalian sovereignty
Viséan
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The Lower Carboniferous observed in boreholes in the Chojnice region of Western Pomerania (NW Poland) is discussed. Strunian, Touraisian and Lower Visean deposits have been macrofaunistically determined.
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