Marmierfjellet, Flowerdalen (Grippia niveau bonebed) (Triassic of Svalbard and Jan Mayen)

Where: Svalbard and Jan Mayen (78.3° N, 16.6° E: paleocoordinates 41.7° N, 8.8° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Vendomdalen Member (Vikinghøgda Formation), Spathian (251.3 - 247.2 Ma)

• The thickness of the bed varies due to uneven compaction of the surrounding shale. The maximum thickness is about 5 cm but generally the deposit is thinner. The Bajarunia euomphala Zone and the Parasibirites grambergi Zone are equally likely whereas placement in the Keyserlingites subrobustus Zone is very unlikely though it cannot be completely excluded. The Bajarunia euomphala Zone is of early Spathian age while the Parasibirites grambergi Zone is of early to middle Spathian age.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, nodular shale

• Grey to black coloured shale matrix with yellow dolomite nodules, bones, teeth and coprolites scattered throughout.

Size class: macrofossils

Collected by Spitsbergen Mesozoic Research Group in 2015

• Repository: Natural History Museum, University of Oslo

Primary reference: J. Bratvold, L. L. Delsett, and J. H. Hurum. 2018. Chondrichthyans from the Grippia bonebed (Early Triassic) of Marmierfjellet, Spitsbergen. Norwegian Journal of Geology 98:189-217 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 196857: authorized by Matthew Clapham, entered by Matthew Clapham on 10.10.2018, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Ichthyopterygia -
 Ichthyosauria - Omphalosauridae
Omphalosaurus sp. Merriam 1906 ichthyosaur
Chondrichthyes
 Euselachii -
Synechodontiformes "indet. 1" Duffin and Ward 1993 elasmobranch
Synechodontiformes "indet. 2" Duffin and Ward 1993 elasmobranch
 Synechodontiformes - Palaeospinacidae
Nemacanthus sp. Agassiz 1836 elasmobranch
 Hybodontiformes -
Hybodontoidea "indet. cephalic spine" Agassiz 1834 elasmobranch
Hybodontoidea "indet. fin spine" Agassiz 1834 elasmobranch
Lissodus angulatus Stensiö 1921 elasmobranch
 Hybodontiformes - Acrodontidae
Acrodus sp. Agassiz 1834 elasmobranch
Acrodus oppenheimeri Stensiö 1921 elasmobranch
Acrodus scaber Stensiö 1921 elasmobranch
Acrodus gaillardoti Agassiz 1834 elasmobranch
Acrodus spitzbergensis Hulke 1873 elasmobranch
Acrodus lateralis Agassiz 1839 elasmobranch
Palaeobates polaris Stensiö 1921 elasmobranch
 Hybodontiformes - Hybodontidae
Hybodus rapax Stensiö 1921 elasmobranch
Hybodus ? microdus Stensiö 1921 elasmobranch
Hybodus sasseniensis Stensiö 1921 elasmobranch
 Hybodontiformes - Polyacrodontidae
Polyacrodus sp. Jaekel 1889 elasmobranch