Preliminary foraminiferal zonation of the Upper Devonian and Lower Carboniferous in Moravia
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Devonian
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Combined study of conodonts and foraminifers through the middle
Tournaisian-lower Visean in Moravia and a compilation of
conodont and foraminiferal data from Palaeotethyan, Siberian
and North American Realms enables worldwide correlation of
Lower Carboniferous foraminiferal zonations, discussion of the
interval about the Tournaisian-Visean boundary, and evaluation
of the biogeography of calcareous foraminifera.
Emigration-immigration events affecting foraminiferal faunas in
higher latitudes correlate with eustatic and isotopic events.
These are consistent with climatic forcing connected with
glaciation in Gondwana. The palaeobiogeograpic pattern of
foraminiferal faunas at the Godwana-Laurussia interface seems
to distinguish Eastern Avalonia on the southern Laurussian
shelf from Perigondwanan terranes to the south.
Tournaisian
Viséan
Conodont
Palaeogeography
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Conodonts have been extracted from calcareous units of the Devonian and Lower Carboniferous sequence from 3 areas in the S. part of the Cantabrian Mountains. There can be distinguished Emsian, Givetian, Frasnian, Famennian and Visean faunas.
Conodont
Viséan
Devonian
Tournaisian
Sequence (biology)
Late Devonian extinction
Westphalian sovereignty
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Conodont
Palaeogeography
Viséan
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Conodonts of Couvinian age are recorded from limestone beds incorporated in a sedimentary sequence which was previously considered to be Late Devonian or Early Carboniferous in age.
Conodont
Devonian
Late Devonian extinction
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Devonian
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The Yunzhug area is located in the Paleozoic Xainza basin, where Early Ordovician-Middle Permian successive marine sedimentary sequences are developed. The rock association of the Carboniferous Yunzhug Formation consists of fine quartzose sandstone, shale and siltstone with several bioclastic limestonebeds, which contain abundant fossils, mainly including brachiopods, bivalves, conodonts, corals,bryozoans,ammonites and trilobites. The conodont Gnathodus girtyi-Gnathodus texanus assemblage is a late Early Carboniferous assemblage; and the brachiopod Productus-Rhipidomella tibetena assemblage is also a late Early Carboniferous assemblage, the brachiopod Choristites- Spirigerella assemblage occurs in the lower part of the early Late Carboniferous and the brachiopod Trigonatreta cf. paucicostulata- Elivella baschkirica assemblage occurs in the upper part of the early Late Carboniferous. Uncinunellina is a typical cold-water brachiopod and Cyathaxonia is a typical cold-water coral, which indicates that the global Carboniferous glaciation had influenced the whole area then. It is confirmed that the age of the Yunzhug Formation is late Early Carboniferous to early Late Carboniferous, and that the boundary between the Early and Late Carboniferous is placed between bed 11 and bed 12.
Siltstone
Assemblage (archaeology)
Conodont
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Abstract This paper discusses contemporaneous knowledge of conodont, foraminiferal, stromatoporoid, tabulate and rugosan faunas through the Devonian carbonate platform of Moravia. In basal parts of the Moravian Devonian, upper Emsian to lowermost Eifelian is documented by conodonts in the Jeseniky Mts. Conodonts are rare in the Middle Devonian and the Middle/Upper Devonian boundary is not yet documented by conodonts. The most important change in the conodont assemblage lies in the upper part of the Pa. triangularis Zone in Moravia; for detailed zonation of Famennian, the system based on phylogeny of Palmatolepis is accepted. Five foraminiferal zones correlated with the standard conodont zonation are distinguished in the Upper Devonian. Several stromatoporoid assemblages were distinguished in the interval from Eifelian to Frasnian; stromatoporoids pass into the Famennian. Eight tabulate coral biozones are known at present, some of which are capable of more detailed division. Biostratigraphically significant tabulates range from Eifelian to the Famennian Pa. crepida Zone. Seven rugose coral biozones are described, ranging from Eifelian to the upper Frasnian Pa. gigas or Pa. triangularis Zones with a local fauna known from the Famennian Pa. crepida Zone. Stromatoporoid and coral faunas are correlated with standard conodont zonation of the Upper Devonian. Stromatoporoid and coral shallow water faunas locally pass from upper Frasnian to Famennian without pronounced systematic changes. However, both diversity and abundance of coral and stromatoporoid faunas decrease noticeably across the Frasnian/Famennian boundary beds.
Conodont
Devonian
Biozone
Tournaisian
Late Devonian extinction
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Seven stratigraphic chapters cover time slices from Precambrian to Neogene; also included are chapters covering tectonic framework, paleomagnetism, physiographic evolution, Quaternary glaciation, volcanic and plutonic regimes, metamorphism, structural styles, metallogeny, energy and ground resources, and natural hazards. A tectonic synthesis chapter and a summary of outstanding problems round out the volume. Accompanying plates include physiographic, tectonic assemblage, terrane and metamorphic maps, correlation charts, structural cross sections, and special maps showing distribution of Proterozoic and Miocene plutonic suites and the metallogeny of terranes.
Metallogeny
Devonian
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In Sardinia (Italy) two sections, located in the southeastern part of the island, expose the Devonian/Carboniferous Boundary: the Monte Taccu Section and the Bruncu Bullai section. Both expose limestones from the middle Famennian to the lower Tournaisian Siphonodella jii Zone. The limestone sequence is interrupted by a thin level of shales representing the Hangenberg Event. Data on conodont biostratigraphy and magnetic susceptibility across the Devonian/Carboniferous Boundary are here summarised and reviewed.
Tournaisian
Conodont
Devonian
Sequence (biology)
Section (typography)
Late Devonian extinction
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The conodont succession from the Moravian Karst reveals good correlation with other areas. All of the seven group of early siphonodellids sensu Kaiser-Corradini (2011) have been easily determined. The calciturbidite succession with more shallow water allochems yielded so far richest foraminiferal association at the Devonian-Carboniferous boundary. where the evolution of foraminiferal fauna is calibrated by conodont zonation.
Conodont
Tournaisian
Devonian
Viséan
Late Devonian extinction
Sequence (biology)
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