East slope of Konusdalen, southeast of Deltaneset (Jurassic of Norway)

Where: Spitsbergen, Norway (78.3° N, 15.9° E: paleocoordinates 69.6° N, 15.6° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Slottsmøya Member (Agardhfjellet Formation), Tithonian (152.1 - 145.0 Ma)

• Upper part of the Slottsmøya Member, Agardhfjellet Formation, Janusfjellet, Middle Volgian (Tithonian; Nagy & Basov, 1998; Collignon & Hammer 2012; Gradstein et al. in press).

•From either the Dorsoplanites maximus or D. ilovaiskyi zone, corresponding to the Middle Volgian

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

• The Slottsmøya Member was deposited in an open marine environment under oxygen-deficient settings (Nagy et al., 1988; Dypvik et al., 1991b). Paleogeographic reconstructions for Svalbard during the Kimmeridgian to Valanginian interval place paleoshorelines several hundred kilometres to the north and west (Dypvik et al., 2002).
• The Slottsmøya Member, which ranges from 70 to 100 metres in thickness in the study area, consists of dark grey to black silty mudstone, often weathering to paper shale, discontinuous silty beds, with local occurrences of red to yellowish sideritic concretions as well as siderite and dolomite interbeds (Dypvik et al., 1991a; Hammer et al., 2011; Collignon & Hammer, this volume).

Size class: macrofossils

Collected by American medical doctors studying the occurrence of the common flu in 1930-31

Collection methods: surface (in situ),

• PMO, Natural History Museum, University of Oslo collection

Primary reference: E. M. Knutsen, P. S. Druckenmiller, and J. Hurum. 2012. Redescription and taxonomic clarification of ‘Tricleidus’ svalbardensis based on new material from the Agardhfjellet Formation (Middle Volgian). Norwegian Journal of Geology 92:175-186 [R. Benson/R. Benson]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 134739: authorized by Roger Benson, entered by Roger Benson on 15.10.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

 Sauropterygia - Cryptoclididae
"Tricleidus svalbardensis n. sp." = Colymbosaurus svalbardensis
"Tricleidus svalbardensis n. sp." = Colymbosaurus svalbardensis Persson 1962 plesiosaur
PMO A 27745, partial postcranial skeleton