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 |
