Rare Silurian age fossil bivalvia - Leiopteria contraria positive & negative !

Description

Specimen:
Nice positive & negative
of
Leiopteria contraria
Barrande 1881
Silurian
Bivalvia fossil !!!
Locality:
Poland, Holy Cross Mountains, Kielce area.
Stratigraphy:
Upper Silurian ( Ludlowian / Pridolian )
Matrix dimensions:
ca 5,5 x 5,5 x 1,0 cm