Calmoutiers, chailles siliceuses (Jurassic of France)

Where: France (47.7° N, 6.3° E: paleocoordinates 38.6° N, 15.4° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Terrain à Chailles Formation, Early/Lower Oxfordian (161.2 - 155.7 Ma)

• Decapod-bearing siliceous nodules are Lower Oxfordian, according to Charbonnier et al. (2012), containing ammonites indicating the Early Oxfordian Cordatum biozone (Enay 1966; Cariou et al. 1997).

• group of beds-level stratigraphic resolution

Environment/lithology: offshore ramp; lithified, nodular, cherty/siliceous limestone

• Evidence from depositional environment, comparisons with others Jurassic crustaceans and modern analogues indicate that the crustacean fauna from the Terrain à Chailles Formation probably inhabited a moderately deep water setting most probably about 100-150 m (lower circalittoral zone)

Size class: macrofossils

Primary reference: A. Étallon. 1859. Description des crustacés fossiles de la Haute-Saône et du Haut-Jura. Bulletin de la Société Géologique de France 16:169-205 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 226086: authorized by Matthew Clapham, entered by Matthew Clapham on 16.06.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Malacostraca
 Decapoda - Eryonidae
Eryon perroni n. sp.
Eryon perroni n. sp. Étallon 1859 decapod
 Decapoda - Portunidae
? Portunus jurensis n. sp.
? Portunus jurensis n. sp. Étallon 1859 swimming crab
 Decapoda - Glypheidae
Glyphea regleyana, "Glyphea udressieri" = Glyphea dressieri, "Glyphea rostrata" = Trachysoma rostrata
Glyphea regleyana Desmarest 1822 decapod
"Glyphea udressieri" = Glyphea dressieri Meyer 1837 decapod
"Glyphea rostrata" = Trachysoma rostrata Phillips 1829 decapod