Where: Spitsbergen, Norway (78.3° N, 15.8° E: paleocoordinates 69.5° N, 15.5° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Dorsoplanites ilovaiskyi–Dorsoplanites maximus ammonoid zone, Slottsmøya Member (Agardhfjellet Formation), Tithonian (152.1 - 145.0 Ma)

• 2.5 metres above the Dorsoplanites Bed, Slottsmøya Member, Agardhfjellet Formation, Janusfjellet. 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 similarly continuous, yellow silt bed were used as marker beds 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 Collignon & Hammer, 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. The specimen described (SVB 1450) here was found 9 metres below the Dorsoplanites bed and 11.8 metres above the yellow silt layer (Hurum et al. 2012, table 1).

Environment/lithology: deep-water; concretionary, sideritic, black, gray, silty mudstone

Size class: macrofossils

Collected by PMO expedition in 2004

Collection methods: surface (in situ),

• SVB, Svalbard Museum, Longyearbyen, Norway

Primary reference: E. M. Knutsen, P. S. Druckenmiller, and J. H. Hurum. 2012. Two new species of long-necked plesiosaurians (Reptilia: Sauropterygia) from the Upper Jurassic (Middle Volgian) Agardhfjellet Formation of central Spitsbergen. Norwegian Journal of Geology 92:187-212 [R. Benson/R. Benson]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 134762: authorized by Roger Benson, entered by Roger Benson on 16.10.2012, edited by Jonathan Tennant

Creative Commons license: CC BY (attribution)