Back
Upper Cretaceous Chalk Group stratigraphy near the isle of Texel, the Netherlands (a multidisciplinary approach).
| Herngreen, G.F.W., Eillebrecht, A.T.J.M., Gortemaker, R.E., Remmelts, G., Schuurma | |
| 1996 | |
| Mededelingen Rijks Geologische Dienst, nr. 56Mededelingen Rijks Geologische Dienst, nr. 56 | |
| Upper Cretaceous Chalk Group stratigraphy near the isle of Texel, the Netherlands (a multidisciplinary approach). |
Herngreen, G.F.W., Eillebrecht, A.T.J.M., Gortemaker, R.E., Remmelts, G., Schuurman, H.A.H.M. and Verbeek, J.W., 1996. Upper Cretaceous Chalk Group stratigraphy near the isle of Texel, the Netherlands (a multidisciplinary approach). Mededelingen Rijks Geologische Dienst, nr. 56 Abstract The present paper approaches the stratigraphy of Upper Cretaceous Chalk Group sediments in the NW Netherlands from four different angles. Samples from three wells, i.e. Den Burg- 1, De Cocksdorp- 1 and Franeker- 1, were investigated biostratigraphically. The well logs were correlated and a seismic analysis performed. Core samples from well Den Burg- 1 were subjected to a sedimentological examination. Cretaceous strata in well Den Burg- 1 overlie Carboniferous sediments. In the nearby well De Cocksdorp- 1 Cretaceous sediments unconformably overlie the Upper Permian. Upper Cretaceous Chalk sediments were deposited in about 50-150 m deep water. The stratigraphical study indicates the presence of several unconformities. Major hiatuses are found: (1) between the Ommelanden Formation and the overlying Lower Tertiary North Sea Group where a considerable part of the Maastrichtian is missing (this gap corresponds to the Laramide tectonic phase), (2) between the Albian Upper Holland Marl and the Middle Holland Shale/Lower Holland Marl succession where the Upper Aptian and Lower Albian are absent and (3) between the base of the Holland Formation and the top of the underlying Vlieland Shale Formation where the Upper Barremian is missing. Minor hiatuses are thought to be present within the Ommelanden Formation. The Lower Cretaceous infra- and intraformational unconformities reflect the onlapping nature of a very incomplete sequence overlying the Texel-lJsselmeer High. A total thinning of over 300 metres in the Upper Cretaceous between wells Den Burg- 1 and De Cocksdorp- 1 - the reduction in thickness can be demonstrated for each stage - indicates Late Cretaceous Subhercynian inversion movements. The truncation of the Maastrichtian reflects the earliest Tertiary Laramide tectonic phase.