Skirsnemunė (beds with Rhynchonella octoplicata) (Cretaceous of Lithuania)

Where: Lithuania (55.1° N, 22.9° E: paleocoordinates 45.0° N, 19.9° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Labguva Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)

• Levels with the brachiopod Rhynchonella octoplicata and those with the belemnite Actinocamax (=Praeactinocamax) plenus which underlie the former, were considered to be Turonian on the basis of both invertebrate taxa (Dalinkevičius, 1934) and shark teeth records such as that of Ptychodus mammillaris Agassiz, 1839. The latter, however, is now known to range from the upper Cenomanian to Coniacian in the Northern Hemisphere (Welton and Farish, 1993; Williamson et al., 1993; Cicimurri, 1998; Shimada and Everhart, 2003; Everhart and Darnell, 2004). The 'gray marls with Rhynchonella octoplicata' in fact appear to be slightly older than anticipated (on foraminiferal evidence; Grigelis and Kisnérius, 1982) and are now dated as late Cenomanian and assigned to the Labguva Formation (see Grigelis and

•Suveizdis, 1993).

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; phosphatic, gray, cherty/siliceous marl

• "relatively deep basin... depth ca. 200 m"
• "light gray marls with flints and phosphate nodules"

Size class: mesofossils

Collected by J.A. Dalinkevičius

• Repository: Vilnius University (COLL-VU)

Primary reference: J. A. Dalinkevičius. 1935. On the fossil fishes of the Lithuanian Chalk. I. Selachii. Vytauto Didžiojo Universiteto Matematikos-Gamtos Fakulteto Darbai 9:243-305 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 213719: authorized by Matthew Clapham, entered by Matthew Clapham on 08.09.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Hybodontiformes - Ptychodontidae
Ptychodus mammillaris Agassiz 1835 elasmobranch
Ptychodus decurrens Agassiz 1838 elasmobranch
 Synechodontiformes - Palaeospinacidae
Synechodus nitidus Woodward 1912 elasmobranch
 Squaliformes - Dalatiidae
Squaliodalatias sp. Adnet et al. 2006 shark
Part of Centrophorus balticus Dalinkevičius 1935
 Squaliformes - Squalidae
Squalus sp. Linnaeus 1758 dogfish shark
Part of Centrophorus balticus Dalinkevičius 1935
"Centrophorus balticus n. sp." = Protocentrophorus balticus Dalinkevičius 1935 dogfish shark
Protosqualus glickmani Averianov 1997 dogfish shark
 Hexanchiformes - Hexanchidae
"Notidanus microdon" = Hexanchus microdon
"Notidanus microdon" = Hexanchus microdon Agassiz 1835 sixgill shark
 Lamniformes - Odontaspididae
"Odontaspis (Synodontaspis) striatula" = Eostriatolamia striatula, "Odontaspis gigas" = Hispidaspis gigas
"Odontaspis (Synodontaspis) striatula" = Eostriatolamia striatula Dalinkevičius 1935 sand tiger shark
"Odontaspis gigas" = Hispidaspis gigas Woodward 1889 sand tiger shark
 Lamniformes - Anacoracidae
"Corax falcatus" = Squalicorax falcatus
"Corax falcatus" = Squalicorax falcatus Agassiz 1843 crow shark
 Lamniformes - Mitsukurinidae
"Scapanorhynchus raphiodon" = Scapanorhynchus rhaphiodon
"Scapanorhynchus raphiodon" = Scapanorhynchus rhaphiodon Agassiz 1843 goblin shark
 Lamniformes - Eoptolamnidae
"Odontaspis macrorhiza" = Leptostyrax macrorhiza
"Odontaspis macrorhiza" = Leptostyrax macrorhiza Cope 1875 mackerel shark