Railroad bridge between Rya and Katslösa (Jurassic of Sweden)

Where: Scania, Sweden (56.0° N, 12.8° E: paleocoordinates 45.4° N, 16.7° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Rydebäck Member (Rya Formation), Late/Upper Pliensbachian (189.6 - 183.0 Ma)

• late Pliensbachian based on a "well-preserved foraminiferal fauna"

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, bioturbated, shelly/skeletal, gray, argillaceous siltstone

• "quiet marine environments below the wave base"
• "poorly lithified, dark grey silts and claystones" that are "completely bioturbated" and include "minor concentrations of shell debris and occasional coal lens"

Size class: macrofossils

Collected by J. Rees, J. Lindgren in 1997

Collection methods: bulk, salvage, acetic, sieve,

• "Bulk samples of sediment were collected in November 1997 during construction of the railroad bridge" including 171 kg of "shell debris concentrations" and 388 kg of "the less fossiliferous silt and clay"; they were "dried and washed" and then frozen, and "Shell debris was dissolved in buffered acetic acid"

Primary reference: J. Rees. 2000. A new Pliensbachian (Early Jurassic) neoselachian shark fauna from southern Sweden. Acta Palaeontologica Polonica 45(4):407-424 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 90692: authorized by John Alroy, entered by John Alroy on 12.08.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• invertebrates (not described) include "frequent belemnites, gastropods, bivalves, echinoderms, and ostracods"
Chondrichthyes
 Hybodontiformes - Hybodontidae
Hybodus reticulatus Agassiz 1837 elasmobranch
 Hexanchiformes - Hexanchidae
Hexanchidae indet. Gray 1851 cow shark
 Euselachii - Agaleidae
Agaleus dorsetensis Duffin and Ward 1983 elasmobranch
 Synechodontiformes - Orthacodontidae
Sphenodus sp. Agassiz 1843 elasmobranch
 Synechodontiformes - Paleospinacidae
Paraorthacodus sp., "Synechodus enniskilleni" = Palidiplospinax enniskilleni, "Synechodus occultidens" = Palidiplospinax occultidens, "Synechodus" sp.
Paraorthacodus sp. Glikman 1957 elasmobranch
"Synechodus enniskilleni" = Palidiplospinax enniskilleni Duffin and Ward 1993 elasmobranch
"Synechodus occultidens" = Palidiplospinax occultidens Duffin and Ward 1993 elasmobranch
"Synechodus" sp. Woodward 1888 elasmobranch
possibly a new species