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Piece of Nummulitic Limestone from the Pyrenees, showing Nummulites laid open by fracture through the median plane; 2, vertical section of Nummulite; 3, Orbitoides.

The recess was formed in nummulitic limestone.

The most important feature is the great development of nummulitic limestone with thin marls and nummulitic sandstones.

Besides being a widespread formation the nummulitic limestone is locally several thousand feet thick.

The next geological formation which is represented is the Eocene, consisting of nummulitic limestone, sandstone and schist.