Petrostoma goldfussi SOLD
System: Cretaceous.
Series: Superior.
Floor: Cenomanian.
Formation: Essener Grünsand (Cenomanian geological formation, from 90-100 million years ago, very characteristic of the Ruhr River basin. It is distinguished by its greenish color thanks to its high content of glauconite, a mineral rich in iron, mixed with marls and calcareous sandstones.).
Origin: Essen, North Rhine-Westphalia, Germany.
Measurements: 2.3 cm x 1.1 cm
Petrostoma is a genre of marine calcareous sponges, belonging to the calls "hypercalcified sponges", a fascinating group within the Minchinellidae family. They are characterized by their hard texture and calcified skeleton, formed by spicules welded together by calcareous cement. Petrostoma presents digitated (finger-shaped) processes that arise from a common base and It develops a rigid basal skeleton where the triaxial and quadradiate spicules are fused laterally by calcite cement.
