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1.2.9. Pesche Formation - PES

Authors: Maillieux, 1910; Asselberghs & Maillieux, 1938; Godefroid, 1979.
Description: Grey or blue grey (greenish or brownish by weathering) shales and siltstones with lenses en layers of sandstones, sometimes containing shells.  The sandstones can also be argillaceous or with a carbonate cement and become limonitic by weathering.
Stratotype: Couvin, Pèrnelle pond, old railway tram trench.
Area: S and SE sides of the Dinant Synclinorium, up to the area between the Ourthe valley and Villers-Ste-Gertrude.
Thickness: 160 m in the Meuse valley, ±190 m in the Couvin area, ±375 m in the Lesse valley, ±400 m S of Grupont, ±400 m in the Ourthe valley; 700-800 m in the Hodister area.
Age: On the base of three species of Brachyspirifer, the Siegenian (@Pragian) - Emsian boundary was defined in the lower part of the Pesche Fm.  Caudicriodus celtibericus was also identified at the base of this formation.  In Spain, this conodont species is associated to Polygnathus dehiscens indicating a Lower Emsian age.