Where: Spitsbergen, Norway (78.3° N, 16.2° E: paleocoordinates 69.5° N, 15.7° E)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Dorsoplanites ilovaiskyi–Dorsoplanites maximus ammonoid zone, Slottsmøya Member (Agardhfjellet Formation), Tithonian (152.1 - 145.0 Ma)
• Approximately 30 metres below the Myklegardfjellet Bed, Slottsmøya Member, Agardhfjellet Formation. Dorsoplanites ilovaiskyi to Dorsoplanites maximus ammonite zones, Middle Volgian (Tithonian; Nagy & Basov, 1998; Collignon & Hammer, 2012; Gradstein et al. in press).
•To further quantify the stratigraphic occurrence of the vertebrate remains, a laterally continuous, sideritic horizon rich in ammonites (especially Dorsoplanites sp.) and bivalves, and a yellow silt bed were used as upper and lower marker beds, respectively, against which the stratigraphic position of each skeleton was measured. The yellow silt bed was set as 0 m. The Dorsoplanites marker bed occurs 27 m above this yellow layer and 21 m below the top of the Slottsmøya Member (Myklegardfjellet Bed; see Hammer et al., 2012), and occurs in the Middle Volgian D. maximus or D. ilovaiskyi zone. The vertical position of each vertebrate specimen was recorded with a Leica TCR 110 total station with <1 cm error at 100 metre distance and later corrected with respect to dip. Both specimens described here (PMO 214.135 and PMO 214.136) occur at almost exactly the same stratigraphic level within the member, at approximately 14 metres below the Dorsoplanites bed, and 14 metres above the yellow silt layer (Hurum et al. 2012, table 1).
Environment/lithology: deep-water; concretionary, sideritic, black, gray, silty mudstone and dolomite
Size class: macrofossils
Collected by PMO expedition in 2008
Collection methods: surface (in situ),
• PMO, Natural History Museum, University of Oslo collection
Primary reference: E. M. Knutsen, P. S. Druckenmiller, and J. H. Hurum. 2012. A new species of Pliosaurus (Sauropterygia: Plesiosauria) from the Middle Volgian of central Spitsbergen, Norway. Norwegian Journal of Geology 92:235-258 [R. Benson/R. Benson]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 134743: authorized by Roger Benson, entered by Roger Benson on 15.10.2012
Creative Commons license: CC BY (attribution)