The Downtonian and Devonian vertebrates of Spitsbergen. XV. New Heterostracans from the Lower Devonian Red Bay Group, northern Spitsbergen

Ilyes, Robert R.; Ohta, Y.; Guddingsmo, Jonny

doi:10.1111/j.1751-8369.1995.tb00708.x

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…The Wulffberget and Erikbreen areas on the northern coast of Liefdefjorden, west of the Hannabreen Fault (SBH), comprise a 4 km wide zone of east verging thrust duplexes consisting of marbles, with a 0.5 km thick package of phyllite and schists in the middle (Ilys et al 1995;Ohta et al 1995). These marbles extend south across Liefdefjorden and form the western limb of a major anticline structure of the SBH.…”

Section: Biscayarfonna Complexmentioning

confidence: 99%

Single-grain zircon dating of the metamorphic and granitic rocks from the Biscayarhalvøya-Holtedahlfonna zone, north-west Spitsbergen

Ohta

Ларионов

Tebenkov³

2003

Polar Research

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The Biscayarhalvøya-Holtedahlfonna zone (BHZ) in north-western Spitsbergen is a north-south trending, narrow horst, with crystalline basement rocks exposed under a Devonian unconformity. Previous K-Ar, 40 Ar/ 39 Ar and Rb-Sr analyses have confi rmed the occurrence of Caledonian thermal events, and Grenvillian ages have been obtained by conventional zircon U-Pb and single-zircon Pb evaporation methods. A total of 55 zircon grains from three samples (an augen metagranite, a micaceous schist and a granitic neosome of migmatite) have been analysed by the single-zircon Pb evaporation method. The grains with the age range of ca. 950 -1100 My (million years) are the major component in all three samples, suggesting tectono-thermal activity in that period. The detrital versus resorption orgin of the rounded shapes of these grains from the granitic neosome is not clear yet. Therefore, the ages of the migmatization and of the sedimentary protoliths are not concluded. The youngest presumed detrital grain from the granitic neosome is 1060 My old. The metagranite, cutting the Richarddalen unit, yielded grains with an age of ca. 950 Mya. A granite dyke with an age range of 955 -968 My cuts the Biscayarhuken unit in the northern Liefdefjorden area. These indicate the sedimentary protoliths of the Richarddalen and Biscayarhuken units are pre-Neoproterozoic. The youngest detrital zircon ages of ca. 940 My indicate Neoproterozoic sedimentary protoliths of the Solanderfjellet micaceous schists. A signifi cant population of zircon grains with an age range of 1600 -1900 My in all three samples suggests a wide exposure of these rocks in the source areas during Meso-and Neoproterozoic times. Several Archean ages have also been obtained. The results are generally conformable with those obtained from north-western Spitsbergen.

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Section: Biscayarfonna Complexmentioning

confidence: 99%

Single-grain zircon dating of the metamorphic and granitic rocks from the Biscayarhalvøya-Holtedahlfonna zone, north-west Spitsbergen

Ohta

Ларионов

Tebenkov³

2003

Polar Research

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“…The Fraenkelryggen Formation of the Red Bay Group was initially believed to be the lowermost unit yielding vertebrate fossils, but material is now known from the lowest Andre Âebreen Sandstone Formation (Gjelsvik and Ilyes 1991) and the lower Red Bay Conglomerate Formation (Ilyes et al 1995). There are six fossil-bearing horizons within the Fraenkelryggen Formation, but two of these did not yield any thelodont taxa (Text-®g.…”

Section: Fraenkelryggen Formationmentioning

confidence: 99%

Thelodont Scales from the Lower Devonian Red Bay Group, Spitsbergen

Blom¹,

Goujet²

2002

Palaeontology

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ABSTRACT. Scales of nine thelodont taxa are described from the Red Bay Group of Spitsbergen, also characterized by its assemblage of other typical Early Devonian vertebrates. The four thelodont-bearing horizons of the lower Fraenkelryggen Formation yield typical Lochkovian thelodont assemblages, containing Boreania minima, Canonia grossi, Nikolivia depressa sp. nov., Nikolivia elongata, Nikolivia gutta and Turinia pagei. One horizon from the younger Ben Nevis Formation has a similar thelodont assemblage, except for two new taxa; Apalolepis angelica sp. nov. and Turinia barentsia sp. nov. The appearance of Turinia polita and the disappearance of Boreania minima is also characteristic for this assemblage. Comparison with similar faunas from the Northern Hemisphere supports this faunal change and allows further elaboration of Early Devonian thelodont biostratigraphy.

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Traquairaspididae and Cyathaspididae (Heterostraci) from the Lower Devonian of Poland

Dec

2020

Annales de Paléontologie

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The Downtonian and Devonian vertebrates of Spitsbergen. XV. New Heterostracans from the Lower Devonian Red Bay Group, northern Spitsbergen

Cited by 5 publications

References 9 publications

Single-grain zircon dating of the metamorphic and granitic rocks from the Biscayarhalvøya-Holtedahlfonna zone, north-west Spitsbergen

Single-grain zircon dating of the metamorphic and granitic rocks from the Biscayarhalvøya-Holtedahlfonna zone, north-west Spitsbergen

Thelodont Scales from the Lower Devonian Red Bay Group, Spitsbergen

Traquairaspididae and Cyathaspididae (Heterostraci) from the Lower Devonian of Poland

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