Conodont faunas from Portugal and southwestern Spain Part 1. A Middle Devonian fauna from near Montemor-o-Novo
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Abstract:
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.Keywords:
Conodont
Devonian
Late Devonian extinction
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Massif
Basement
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The brachiopod genus Zdimir is widely distributed in Southwest China and South Xinjiang. Its age ranges from late Early Devonian to early Middle Devonian. The present specimens were collected from the medium-thick, grey-black bioclastic limestone near the border of Simuhana of western Wuqia, western part of the Dongalaishan, South Tianshan, which was assigned as “Middle Devonian Tuogemaiti Formation” over the past years. However, research on the brachiopod Zdimir fauna and corals provide a late Early Devonian age for these beds. The lithological characters containing the Zdimir fauna are quite different from that of the real Middle Devonian Tuogemaiti Formation in the eastern part of the Dongalaishan to Kuokeshalei with Stringocephalus and Bornhardtina fauna, so a new formation should be established for these bioclastic limestone.
Devonian
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A Middle to Upper Bispathodus costatus Zone conodont fauna is described from the top of the Phyllite-Quartzite Group in the Iberian Pyrite Belt. The colour of the conodonts is in agreement with the very-low-grade regional metamorphism in the pumpellyite facies.
Conodont
Phyllite
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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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A Famennian conodont fauna is described. The possible relationship between Palmatodella cf. delicatula, Prioniodina? smithi and other forms in Famennian faunas is discussed.
Conodont
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Devonian Faunas and Major Depositional Events in the Southern Alexander Terrane, Southeastern Alaska
Abstract The Alexander Terrane of southeastern Alaska has the most complete Paleozoic stratigraphic sequences of any known Alaskan suspect terrane, and within these Paleozoic sequences those of Devonian age are particularly important. Early, Middle and Late Devonian fossils occur, principally on the western side of Prince of Wales Island and on smaller nearby islands. Good faunas of conodonts, brachiopods, corals and graptolites have been collected, with most of the shelly fossils coming from limestones. Limestones occur widely in early to late Pragian, middle to late Eifelian, middle Givetian, middle to late Frasnian and middle Famennian times. These limestones are occasionally interlayered with a variety of lava flows and pyroclastics, possibly indicating a volcanic arc origin. Infrequent graptolitic and plant-bearing shales of Early Devonian age may represent pelagic deposits. The earliest Lower Devonian limestone that forms the north end of Lulu Island has yielded early Lochkovian conodonts and brachiopods. Pragian brachiopods and conodonts have been recovered from several localities. Late Pragian to early Emsian graptolites occur on northeast Noyes Island and at Port St. Nicholas and Klakas Inlet on Prince of Wales Island. Emsian conodonts and brachiopods occur on Wadleigh and Kasaan Islands, just west and east of Prince of Wales Island, respectively. The earliest known Middle Devonian occurs on Alberto Island and also just north of Staney Creek on Prince of Wales Island. At both localities middle to late Eifelian conodonts, brachiopods and corals occur in the Wadleigh Limestone. Givetian conodonts and brachiopods are known from Coronados Island and the easternmost of the Alberto Islands. The earliest Late Devonian so far recognized consists of the upper parts of the Wadleigh Limestone. This has yielded good Frasnian conodonts, brachiopods and corals on Wadleigh Island and also on one of the Coronados Islands several kilometres to the south. A middle Famennian brachiopod fauna has been described from the Port Refugio Formation on Suemez Island. In general the Alexander terrane faunas have most affinity with coeval faunas in Nevada, East-central Alaska, and the Northwest Territories (Canada).
Devonian
Late Devonian extinction
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Upper Devonian conodonts from two localities in the Tindouf basin of northern Spanish Sahara are placed in 18 genera and 35 species. These conodonts occur in greater abundance and diversity of species than the other Devonian occurrences previously reported from northern Africa but appear to be of the same age. Collectively the fauna compares closely to those of classic areas in central Europe and serves to establish the age of the enclosing strata as Frasnian. No conodonts were obtained from various limestones containing ammonoids of middle Devonian age. Silurian conodonts from four localities in northern and central Spanish Sahara are comparable to faunas from central Europe and southern Spain. Spathognathodus dubius n.sp. is included among the forms systematically described.
Devonian
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A Frasnian conodont fauna is described. The possible composition of the multielement conodont apparatus of Polygnathus decorosus Stauffer, 1938 is discussed.
Conodont
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The Late Devonian Gumusali formation of the eastern Taurides is a terrigenous-carbonate rock sequence about 600 m thick, consisting mainly of quartz sandstone, quartz siltstone, shale, and carbonate rocks. Palaeontologic and sedimentologic data mainly indicate a shallow subtidal depositional environment. This sequence generally represents the shallow-water polygnathid-icriodid biofacies, and contains conodont faunas that range from the Upper falsiovalis Zone into the Upper praesulcata Zone. However, they do not correlate well to the Late Devonian standard conodont zonation because of the lack of zonally diagnostic species and the irregular vertical distributions of the present taxa. Herein, 54 taxa belonging to nine genera are described and illustrated from the studied section. Icriodus adanaensis, Icriodus fekeensis, and Polygnathus antecompressus are the newly described species.
Conodont
Devonian
Siltstone
Terrigenous sediment
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