2.1.4. Harchies Formation - HAR

Authors:Marlière (1936b).

Description: Alternation of "spongolites", phosphatic conglomerates and glauconitic sands. Marine fauna is very poorly preserved.

Stratotype: Harchies pit (see Marlière, 1936b, 1939).

Area: Western part of the Mons Basin.

Thickness: 52 m in the Harchies pit.

Age: In the basal part of the Formation, Actinoceramus concentricus and A. sulcatus co-occur, which are characteristic of the base of the Late Albian.