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1. Introduction The 302 m deep Maaseik borehole (BGD 49W0220, DOV kb18d49w-B220), located in the Roer Valley Graben (RVG) affecting part of northeast Limburg, was drilled in 1980 as a reconnaissance borehole at the initiative of the Geological Survey of Belgium (Fig. 1). A stratigraphic interpretation of this core was published by Vandenberghe et al. (2005). Lithologically the pre-Quaternary section can be subdivided in two main parts: above 198 m depth mainly pale-colored and quartz-rich sand with clays and brown coal or lignite towards its top and below 198 m depth occurs green glauconite-rich sand. The basal part of the pale-colored sand between 192.7 m and 198 m depth is singled out because of its finer grain size (modal size between 128 and 174 µm), high mica content, faint lamination, a few percentages of glauconite pellets and high natural gamma ray (GR) signature. This basal part of the pale-colored sand above 198 m was interpreted as a shallow marine deposit. Its position in the regional lithostratigraphy was unknown and therefore it was given the name unit X by Vandenberghe et al. (2005). The overlying fluviatile quartz-rich sand and the clays and brown coal above 192.7 m depth was recognized as the Kieseloolite Formation while the glauconite sand below 198 m was recognized as the marine Breda Formation. Figure 1. Location of the study area in northern Belgium. The fault pattern is part of the western border of the Roer Valley Graben (modified after Vandenberghe e

A reappraisal of the stratigraphy of the upper Miocene unit X in the Maaseik core, eastern Campine area (northern Belgium)