The Janusfjellet Subgroup (Bathonian to Hauterivian) on central Spitsbergen: a revised lithostratigraphy

Dypvik, Henning; Eikeland, Tor Arne; Backer‐Owe, K.; Andresen, Arild; JOHANEN, H; Elverhøi, Anders; Nagy, Jenő; Haremo, Pål; Biærke, T.

doi:10.1111/j.1751-8369.1991.tb00400.x

Cited by 50 publications

(70 citation statements)

References 9 publications

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“…The Agardhfjellet Formation is separated from the overlying Lower Cretaceous Rurikfjellet Formation by a regionally recognizable layer known as the Myklegardfjellet Bed (Dypvik et al, 1991) (Fig. 1).…”

Section: Geological Settingmentioning

confidence: 99%

Osteology and relationships ofColymbosaurusSeeley, 1874, based on new material ofC. svalbardensisfrom the Slottsmøya Member, Agardhfjellet Formation of central Spitsbergen

Roberts

Druckenmiller

Delsett

et al. 2017

Journal of Vertebrate Paleontology

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ABSTRACT-Colymbosaurus is a genus of long-necked plesiosaurian represented by two valid species: C. megadeirus from the Upper Kimmeridge Clay Formation (Kimmeridgian-Tithonian) of the United Kingdom and C. svalbardensis from the Slottsmøya Member of the Agardhfjellet Formation (Tithonian-Berriasian) of Svalbard, Norway. Due to the lack of complete and articulated skeletons and a near absence of cranial material, Colymbosaurus has been problematic to characterize morphologically. Here, we describe and conduct a phylogenetic analysis on an informative new specimen referable to C. svalbardensis from the Slottsmøya Member, preserving a large portion of the axial and appendicular skeleton. The new material contributes important new osteological data for the species and together with an extensive examination of congeners in British museums, clarifies the diagnostic characters of the genus. We provide two new diagnostic characters of the epipodials for the genus and reevaluate the utility of an anteroposteriorly oriented bisecting ridge on the distal end of the propodials. We also present two new diagnostic features for C. svalbardensis regarding the neural canal and femoral morphology. A phylogenetic analysis recovers a monophyletic and well-supported Colymbosaurus. The new specimen of C. svalbardensis confirms that this species is not synonymous with other described Slottsmøya Member plesiosauroids, demonstrating considerable diversity of the clade at high latitudes close to the Jurassic-Cretaceous boundary.

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Section: Geological Settingmentioning

confidence: 99%

Osteology and relationships ofColymbosaurusSeeley, 1874, based on new material ofC. svalbardensisfrom the Slottsmøya Member, Agardhfjellet Formation of central Spitsbergen

Roberts

Druckenmiller

Delsett

et al. 2017

Journal of Vertebrate Paleontology

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“…profile. This part of the Knorringfjellet profile generally consists of coarser material, and a higher energy regime has been suggested (Dypvik et al, 1991a(Dypvik et al, , 1991b.…”

Section: Comparisons Between the Palynofacies (Palynodebris Assemblages)mentioning

confidence: 99%

Organic-walled microfossils and palynodebris in cold seep carbonate deposits: The Upper Jurassic–Lower Cretaceous Agardhfjellet Formation on Svalbard (Arctic Norway)

Dalseg¹,

Nakrem²,

Smelror³

2016

NJG

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This study gives the first detailed report of palynomorphs from Mesozoic cold hydrocarbon seep deposits. The organic-walled microfossils and palynodebris comprise ex situ fossil material in the seep deposits of the Upper Jurassic-Lower Cretaceous Agardhfjellet Formation, and consist of both specimens that originated during the time of deposition and a few fossils reworked from older strata. The palynomorphs from the Agardh fjellet Formation carbonate seep deposits in Central Spitsbergen, Svalbard, are better preserved than the palynological material in the shale deposits in the same formation. This is due to early authigenic precipitation of carbonate, which led to a relatively rapid cementation of the sediments, preventing flattening of the fossils. The Non-metric Multidimensional Scaling (NMDS) of the dinoflagellate cyst assemblages in the studied succession shows an age-specific trend, rather than being environmentally controlled, while the NMDS of the palynofacies shows that the content of palynodebris in the samples is more environmental-specific than age-specific.

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“…The Adventdalen Group is subdivided into four formations (Mørk et al 1999). The Bathonian-Valanginian Agardhfjellet Formation, like its offshore counterparts in the Barents Sea, the Fuglen and Hekkingen formations, was deposited under conditions with a low sediment supply and periodic high organic production in an inner-to outer-shelf environment (Dypvik et al 1991). The overlying Valanginian-Hauterivian Rurikfjellet Formation consists of inner-shelf mudstone passing upwards into prodelta/lower shoreface/distal delta-front environments and defines a large-scale regressive unit (Gjelberg & Steel 1995).…”

Section: Geological Settingmentioning

confidence: 99%

The theropod that wasn't: an ornithopod tracksite from the Helvetiafjellet Formation (Lower Cretaceous) of Boltodden, Svalbard

Hurum

Druckenmiller

Hammer

et al. 2016

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Abstract:We re-examine a Lower Cretaceous dinosaur tracksite at Boltodden in the Kvalvågen area, on the east coast of Spitsbergen, Svalbard. The tracks are preserved in the Helvetiafjellet Formation (Barremian). A sedimentological characterization of the site indicates that the tracks formed on a beach/margin of a lake or interdistributary bay, and were preserved by flooding. In addition to the two imprints already known from the site, we describe at least 34 additional, previously unrecognized pes and manus prints, including one trackway. Two pes morphotypes and one manus morphotype are recognized. Given the range of morphological variation and the presence of manus tracks, we reinterpret all the prints as being from an ornithopod rather than a theropod, as previously described. We assign the smaller (morphotype A, pes; morphotype B, manus) to Caririchnium billsarjeanti. The larger (morphotype C, pes) track is assigned to Caririchnium sp., differing in size and interdigital angle from the two described ichnospecies C. burreyi and C. billsarjeanti. The occurrence of a quadrupedal, small to medium-sized ornithopod in Svalbard is puzzling, considering the current palaeogeographical reconstructions and that such dinosaur tracks have mainly been described from Europe but not North America.Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.

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The Janusfjellet Subgroup (Bathonian to Hauterivian) on central Spitsbergen: a revised lithostratigraphy

Cited by 50 publications

References 9 publications

Osteology and relationships ofColymbosaurusSeeley, 1874, based on new material ofC. svalbardensisfrom the Slottsmøya Member, Agardhfjellet Formation of central Spitsbergen

Osteology and relationships ofColymbosaurusSeeley, 1874, based on new material ofC. svalbardensisfrom the Slottsmøya Member, Agardhfjellet Formation of central Spitsbergen

Organic-walled microfossils and palynodebris in cold seep carbonate deposits: The Upper Jurassic–Lower Cretaceous Agardhfjellet Formation on Svalbard (Arctic Norway)

The theropod that wasn't: an ornithopod tracksite from the Helvetiafjellet Formation (Lower Cretaceous) of Boltodden, Svalbard

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