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5.10. Orient Formation – ORI

 

Authors: de Dorlodot, 1909; Camerman, 1944; Mortelmans, 1969; Hennebert & Doremus, 1997a, 1997b.

Description: Dark grey calcareous shales, with crinoidal and fossiliferous limestone beds, sometimes sandy. The formation overlies the Landelies Fm.

Stratotype: Not exposed at present.

Area: Western HSA (Tournai area).

Thickness: 60 m in the Tournai borehole and 58 m in the Leuze borehole.

Age: Latest Hastarian (based on the macrofauna, Paproth et al., 1983).