Oud-Turnhout Facies

The information on this page is a summary description.
The full formal description is available here: Oud-Turnhout Facies

Abbreviation KlOu
Parent unit Lichtaart Member
Child units
Lithological description The Oud-Turnhout Facies is a glauconite-rich facies of the Lichtaart Member (Kasterlee Formation). It’s high glauconite content (30%) makes it distinct from the Hoge Berg Facies (4-5% glauconite). Other sedimentological characteristics of both facies are similar.
Age Dinoflagellate cyst biozone DN10 was identified in the Oud-Turnhout Facies (Rees borehole, 017E0399; kb8d17e-B495), attributing a late Tortonian to Messinian Miocene age to this facies.
Thickness In the boreholes of the Turnhout area, Gierle (017W0158/kb8d17w-B14), Rees (017E0399/kb8d17e-B495), Oud-Turnhout (017E 0401;kb817e-B497) and Turnhout (017E0398; kb8d17e-B294), the Oud-Turnhout Facies of the Lichtaart Member occurs underneath the Poederlee Sand and the thickness is 8 to 11 m.
Area of occurrence The Oud-Turnhout Facies is known from boreholes in the Turnhout area and occurs north of the Hoge Berg Facies in the Lichtaart-Kasterlee hill ridge.
Type locality Several boreholes in the Turnhout area contain reference data on the Lichtaart Member, where the northern glauconite-rich Oud-Turnhout Facies is present. The reference section selected for the Lichtaart Member is in the Rees borehole (017E0399; kb8d17e-B495). The full section described as Kasterlee Formation between 25 and 33,5 m is interpreted as the Lichtaart Member. Cores, sediment analyses and dinoflagellate cyst analyses are available in this interval (Buffel et al., 2001; Vandenberghe et al., 2020). The Kasterlee Formation in the Gierle borehole (017W0158 ; Kb8d17w-B14) between 26 and 34 m is also identified as the Lichtaart Member and has detailed grain-size analyses (Gullentops and Huyghebaert, 1999). Although the base of the Lichtaart Member is not reached in the Oud-Turnhout borehole (017E 0401;kb817e-B497), a section of about 11 m of the Lichtaart Member between 39 and 50 m with sediment analyses is juxtaposed to a gamma-ray log of the similar interval in the nearby Turnhout borehole (017E0398; kb8d17e-B294) in Louwye et al. (2020 fig. 4).
Alternative names
Authors Verhaegen, J. & Vandenberghe, N.
Date 01/09/2023
Cite as Verhaegen, J. & Vandenberghe, N., 2023. The Oud-Turnhout Facies, 01/09/2023. National Commission for Stratigraphy Belgium. http://ncs.naturalsciences.be/lithostratigraphy/Oud-Turnhout-Facies
We are using cookies to give you the best experience. You can find out more about which cookies we are using or switch them off in privacy settings.
AcceptPrivacy Settings