Lonzée Member

The information on this page is a summary description.
The full formal description is available here: Lonzée Member

Abbreviation LON
Parent unit Chalk group
Child unit
Lithological description From bottom to top:
– basal grey to green clay-silt, overlying Silurian bedrock, with many moulds of bivalves and gastropods;
– grey-green glauconitic clay-silt, with planar bedding; no macrofossils;
– blue clay with numerous bivalves, belemnites, shark teeth, teleosts, mosasaurs (thickness: up to 60 cm);
– fine grey sand with large blocks of glauconitic sandstone with many bivalves, belemnites, microfauna etc.(thickness: 145 cm);
– glauconitic, dark green-blue clays, with many bivalves, belemnites, shark teeth, fish vertebrae (thickness: 20 cm);
– indurated calcarenite and sand (thickness 15 cm);
– yellowish green or brown, glauconitic, very sandy clay, with numerous silicified shell fragments (thickness: 30 cm)
Age ? Coniacian – Santonian – ? basal Campanian:
Cephalopods: Actinocamax verus, Gonioteuthis westfalica westfalica, G. westfalicagranulata, G. granulata, ? G. granulataquadrata. Inoceramids: Inoceramus (Heroceramus) cf.hercules, I. (Volviceramus) cf.koeneni
Thickness About 3 m (unpublished section drawn by M. Glibert in 1936).
Area of occurrence Known occurrence of this member is restricted to the area around Lonzée near Gembloux (Namur).
Type locality No stratotype fixed; at present there are no outcrops in the succession.
Alternative names
Authors Robaszynski, F., Dhondt, A.V. & Jagt, J.W.M.
Date 01/01/2001
Cite as Robaszynski, F., Dhondt, A.V. & Jagt, J.W.M., 2001. The Lonzée Member, 01/01/2001. National Commission for Stratigraphy Belgium. http://ncs.naturalsciences.be/lithostratigraphy/Lonzee-Member

Lithostratigraphic units

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