Results 131 to 140 of about 325 (174)

Devonian (Givetian) Hyolitha from the Kersadiou Formation, Massif Amoricain, France

Journal of Paleontology, 2010
Among hyoliths from the Givetian Kersadiou Formation in northwestern France one form is assigned to Hyolithes triliratus Hall, 1879, which is used as the basis for Brittanella new genus. The occurrence of this species in France supports affinity for fauna in that region to the Eastern Americas Realm. Other hyoliths from this unit include one species of
Malinky, John M., Racheboeuf, Patrick R.
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Devonian (Givetian) miospores from the Walls Group, Shetland

Geological Society, London, Special Publications, 2000
Abstract Miospores demonstrate that the Walls Group of West Shetland is of early and possibly in part late Givetian age (Late Mid-Devonian age). This is both substantially younger in age and of a shorter duration than previously estimated. The correlative rocks of the Walls Group are those of southeast Shetland, Fair Isle, the Eday Group of ...
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Devonian (Emsian, Givetian) blastoids and crinoids from the Tafilalt, Morocco

Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, 2018
Two Emsian species of crinoids, Kroppocrinus garamdouaraensis n. sp. and Elicrinus? weyeri, and two species of blastoids, Pentremitidea pailleti (Emsian) and Hyperoblastus clavatus (Givetian), are described herein from the Tafilalt of Morocco. The crinoid records expand the sparse record of Devonian crinoids within Morocco; the blastoids represent the ...
Waters, Johnny A, Klug, Christian
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Devonian precessional and other signatures for establishing a Givetian timescale

Geological Society, London, Special Publications, 1995
Abstract Palaeozoic radiometric dates are so isolated and crude as to offer little numerical precision in stratigraphy. In a Givetian sequence of pelagic micrites in the Montagne Noire of southern France there is a succession of small-scale microrhythms which appear to represent precessional signatures.
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Earliest vertebrate embryos in the fossil record (Middle Devonian, Givetian)

Palaeontology, 2020
AbstractSerial sectioning of a nodule encapsulating an adult specimen of the arthrodire placoderm Watsonosteus fletti from the Eday Flagstone Formation (Givetian) in the Orcadian Basin of northern Scotland has revealed the presence of a number of embryos within the adult. This specimen represents the oldest known record of fossilized vertebrate embryos.
Michael J. Newman, Jan den Blaauwen, Carole Burrow, Roger Jones   +3 more
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Givetian

2006
Dejonghe, Léon (Ed.).
Casier, Jean-Georges, Préat, Alain
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Givetian (Middle Devonian) historical bio- and chronostratigraphical subdivision based on conodonts

Lethaia, 2017
The conodont record supports the intended threefold subdivision of the Givetian as envisaged by the International Subcommision on Devonian Stratigraphy into Lower, Middle and Upper Givetian substages. The lower boundary of the Lower Givetian Stage coincides with the lower boundary of the Givetian and it is recognized with the entry of Polygnathus ...
Liao, Jau-Chyn, Valenzuela Ríos, José Ignacio   +1 more
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Ostracods and rock facies of the Eifelian/Givetian and Givetian/Frasnian boundary stratotypes

2006
info:eu-repo/semantics ...
Casier, Jean-Georges, El Hassani, A., Préat, Alain   +2 more
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Devonian (Givetian–Frasnian) stromatoporoids from the subsurface of Saskatchewan, Canada

Canadian Journal of Earth Sciences, 1990
Samples from the Duperow, Souris River, and Dawson Bay formations collected from a mine shaft near Esterhazy, Saskatchewan, contain the stromatoporoids that are described in this paper. The lower beds of the Duperow Formation, corresponding to members 1 and 2, contain a stromatoporoid fauna of 11 species, most of which occur in the Upper Cairn and ...
Colin W. Stearn, Dasharathlal H. Shah
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Wenlock to Givetian deformation in the British Isles and the Canadian Appalachians

Geological Society, London, Special Publications, 1988
SummaryA combination of stratigraphic evidence and dates on igneous rocks suggests that the climax of Caledonian deformation in the British Isles and of Acadian deformation in the Canadian Appalachians both occurred during the middle to late Emsian stage, or about 397 to 390 Ma ago.
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