The information on this page is a summary description.
The full formal description is available here: Jonquoi Formation
Abbreviation
JON
Parent unit
Child units
Lithological description
Unfossiliferous homogeneous unit of green shale (Michot, 1954); mudstone and green shale with rare thin clayey micaceous siltstone or fine sandstone beds (Martin, 1969a); olive green shale with intercalated grey-blue, green or grey-brown finely laminated shale, sometimes sandy, and a rare calcareous decimetric nodule level (Maes et al., 1978).
Age
At Haute-Calange the Cyrtograptus rigidus graptolite biozone was found (Michot, 1954); in the park of Neuville-sousHuy two levels from the C. rigidus or C. lundgreni graptolite biozones and 700 m east of Neuville-sous-Huy the C. linnarsoni (= C. rigidus) biozone were recognised (late Sheinwoodian or early Homerian, mid or late Wenlock) (Rickards in Maes et al., 1978).
Thickness
± 300 m (Michot, 1957).
Area of occurrence
Condroz inlier.
Type locality
Not clearly defined; area around the hamlet of Jonquoi, near the city of Fosses (Martin, 1969).
Alternative names
Authors
Verniers, J., Herbosch, A., Vanguestaine, M., Geukes, F., Delcambre, B., Pingot, J.-L., Belanger, I., Hennebert, M., Debacker, T., Sintubin, M. & De Vos, W.
Date
01/01/2001
Cite as
Verniers, J., Herbosch, A., Vanguestaine, M., Geukes, F., Delcambre, B., Pingot, J.-L., Belanger, I., Hennebert, M., Debacker, T., Sintubin, M. & De Vos, W., 2001. The Jonquoi Formation, 01/01/2001. National Commission for Stratigraphy Belgium. https://ncs.naturalsciences.be/lithostratigraphy/Jonquoi-Formation
