Pey Bed

The information on this page is a summary description.
The full formal description is available here: Pey Bed

Abbreviation KzPe
Parent unit Brunssum Member
Child units
Lithological description A fine to medium sized pale grey to white sand intercalated between the two Brunssum clay Beds named upper or I and lower or II. Clay laminae, lignitic levels and clay clasts are present. A 2-3 m thick clay layer in the middle of the sand is reported in the explanatory notes of the geological map 18-10 Maaseik + Beverbeek (Sels et al., 2001). On the geophysical log pattern of the Maaseik (049W0220) the sediments are arranged in a few cycles (Vandenberghe et al., 2005, figs 2 & 10) but in general the log signatures in other boreholes can be quite different. Still the Pey Sand Bed is an important regional hydrogeological layer.
Age The palynological interpretation by Vanhoorne reported in Vandenberghe et al. (2005) is not contradicting a Brunssumian age as given in Wong et al. (2007). Also in the Maaseik borehole according to Vanhoorne, the Brunssum Clay Bed I, just above the Pey Sand, and the about 20 m above it, have a pollen spectrum (‘upper part of palynozone A’) comparable to the spectrum in the Maat Lignite Bed of the Mol Formation.
Thickness Thickness of the Pey Bed between 2 Brunssum Clay Member units varies between about 3 and 30 m (Vandenberghe et al., 2005, fig.10).
Area of occurrence The Pey Bed can only be identified where 2 Brunssum Clay Beds can be distinguished in the Belgian part of the Roer Valley Graben (RVG).
Type locality The Pey Bed sand reference is the interval 88-120,2 m in the Maaseik (049W0220) cored borehole where the bed has its thickest development in the Belgian part of the RVG and of which analyses and geophysical logs are available (Vandenberghe et al., 2005).
Alternative names The sand unit named Pey sand in this LIS is unnamed in the H30-project but labelled as Ki-z-3 between Ki-k-2 and Ki-k-3 (Dusar et al., 2014) or just undifferentiated ki-z in Vernes et al. (2018).
Authors Vandenberghe, N., & Dusar, M.
Date 01/09/2023
Cite as Vandenberghe, N., & Dusar, M., 2023. The Pey Bed, 01/09/2023. National Commission for Stratigraphy Belgium.
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