lamellibranche: Plicatula
Here a specimen preserved well and of beautiful size of Plicatula radiola. That represented on the photograph comes from the career of Courcelles. It was discovered on the level of the layer of the Bench "B". It is not very rare, but not very running either. I never found some in the level immediately above (level than annahoplites planus), but my research in this upper part was less assiduous; thus not of hasty conclusions.
Opposite the specimen represented in its real face. It is a little close the maximum size that one can find
below some enlargings
My bibliogaphic references below

FOSSILS Of the GAULT of the AUBE by Geological Association Auboise. 1982

Plicatula radiola Lamarck x1,5 Le Gaty

in d'Orbigny,Pal.F.T.cré., III, pl463, fig1-7

in Gillet, Lamell. néocomiens, fig35 du texte

ALBIAN of AUBE Vol.5 . Editions du C.N.R.S. 1979

Plicatula radiola LK. forme gurgitis P. et ROUX x1. Albien moyen. niv P6. Wissant.