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    Wyświetlanie 1-3 z 3
    Tytuł:
    Revision of latest Givetian-Frasnian Atrypida [Brachiopoda] from central North America
    Autorzy:
    Day, J
    Copper, P
    Powiązania:
    https://bibliotekanauki.pl/articles/20627.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Late Frasnian
    fauna
    brachiopod fauna
    Frasnian
    Late Devonian
    Devonian
    Atrypida
    taxonomy
    North America
    Givetian
    Brachiopoda
    paleontology
    Opis:
    The brachiopod fauna of the Middle-Late Devonian cratonic carbonate platform deposits of the Iowa Basin, central North America, contains twenty species of the order Atrypida, some of which are types for widespread genera common in Middle and Late Devonian faunas. The latest Givetian-early Frasnian deposits yield a diverse fauna consisting of ten species (two new) included in Desquamatia (Independatrypa), D. (Seratrypa), Pseudoatrypa, Radiatrypa, Spinatrypa (Spinatrypa) and Spinatrypina (Exatrypa). Many of these forms occur in, or are closely similar to species known from, coeval faunas of central and western Canada. Middle Frasnian deposits of northern Iowa contain two species included in Spinatrypa (S.) and Pseudoatrypa, both of which are new. Late Frasnian strata of the Iowa Basin yield eight species included in Costatrypa, Iowatrypa, Pseudoatrypa, and Spinatrypa (Spinatrypa), some of which are widespread in other subtropical and tropical faunas of the western US and western Canada. The taxa Pseudoatrypa witzkei sp. n., Spinatrypa (S.) bunkeri sp. n., Spinatrypa (S.) thompsoni sp. n., and Spinatrypina (Exatrypa) johnsoni sp. n. are proposed. Pseudoatrypa? sp. from the very late Frasnian of southern New Mexico is also illustrated.
    Źródło:
    Acta Palaeontologica Polonica; 1998, 43, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Post-extinction survivor fauna from the lowermost Famennian of Eastern North America
    Autorzy:
    Day, J
    Over, D.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/21376.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Famennian
    brachiopod fauna
    conodont fauna
    stratigraphy
    fauna
    Frasnian
    Conodonta
    extinction
    survivor fauna
    Brachiopoda
    North America
    paleontology
    Opis:
    An earliest Famennian (Late Devonian) shell bed was discovered in the Hanover Shale Member of the Java Formation 1.4 meters above the Frasnian–Famennian (F–F) boundary in western New York. The invertebrate shelly fauna of the shell bed (Lower Palmatolepis triangularis conodont Zone), provides information on taxonomy of an outer shelf benthic association during the survival interval of recovery in the Appalachian foreland basin soon after the terminal Upper Kellwasser event marking the F–F mass extinction. Shelly invertebrates are extremely rare in the upper Hanover immediately above and below the shell bed. Abundance of brachiopod valves and remains of other groups in the shell bed reach 80–100 valves/100 cm2. Elongate valves of the linguloid brachiopod Barroisella cf. B. campbelli have preferred alignments roughly parallel to direction of down−slope flow in the deep−water foreland basin depositional setting. The brachiopod fauna is dominated by the representatives of Retichonetes, Barroisella, Cyrtospirifer, Tylothyris, and Praewaagenoconcha. Rare elements include species of Thiemella, Schizophoria, Ripidiorhynchus?, Chapinella?, an indeterminate rhynchonellid, Ambocoelia, and extremely rare Orbiculoidea. Forms including Cyrtospirifer hornellensis, Tylothyris mesacostalis, Praewaagenoconcha speciosa, and few others are late Frasnian carryovers. The range inception of Thiemella leonensis is just above the F–F boundary (Upper Kellwasser horizon) in the upper Hanover Shale shell bed in the western Appalachian foreland basin.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of latest Givetian-Frasnian Atrypida [Brachiopoda] in central and western North America
    Autorzy:
    Day, J
    Powiązania:
    https://bibliotekanauki.pl/articles/22776.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    brachiopod fauna
    fauna
    Atrypida
    mass extinction
    Brachiopoda
    Givetian
    Frasnian
    Devonian
    biogeography
    biostratigraphy
    distribution
    North America
    paleontology
    Opis:
    Diverse atrypid brachiopod faunas characterize very late Givetian-early Frasnian deposits of Devonian Transgressive-Regressive (T-R) cycle IIb in North America which feature species of Desquamatia (Seratrypa), Desquamatia (Independatrypa), Pseudoatrypa, Radiatrypa, Spinatrypina (S.), S. (Exatrypa), Spinatrypa (S.), Davidsonia, and possibly Iowatrypa Middle Frasnian faunas are not well documented in much of North America. Middle Frasnian deposits of T-R cycle IIc in the Great Basin, Iowa, and the southern Northwest Territories and Mackenzie shelf feature species of Neatrypa, Pseudoatrypa, Radiatrypa, D. (Seratrypa), Spinatrypa, and possibly Costatrypa. Radiatrypa does not carry over into late Frasnian rocks of T-R cycle IId in North America. Genera common to late Frasnian deposits of T-R cycle IId-1 in central and western North America include widespread species of Pseudoatrypa, Spinatrypa, Costatrypa, Iowatrypa. D. (Seratrypa) and Neatrypa were restricted to the tropical platforms of western Canada at that time. Very late Frasnian brachiopod faunas of T-R cycle IId-2 yield species of Pseudoatrypa, Spinatrypa, Iowatrypa, and Pseudoatrypa? (southwest US only). Available data on Late Frasnian brachiopod records in North American subtropical platforms (New Mexico and Iowa) indicate that two successive stepped late Frasnian extinction events affected those faunas, coinciding with the Lower Kellwasser Event and the Frasnian-Famennian (F-F) Event. Over half of the atrypid genera represented in late Frasnian North American faunas survived the first wave of extinctions (Lower Kellwasser Event). The surviving species, recorded in very late Frasnian deposits of Devonian T-R cycle IId-2, became extinct during the final crisis associated with the F-F Event.
    Źródło:
    Acta Palaeontologica Polonica; 1998, 43, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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