Echinoids are the commonest fossils found in the eluvial flint deposits on top of the Late Maastrichtian Lixhe and Lanaye Members of the Gulpen Formation and the basal part of the Maastricht Formation at the Sint Pietersberg (Montagne Saint-Pierre) near Flallembaye (NE Belgium). Topographical and stratigraphical details of this flint eluvium ('vuursteeneluvium') are given (Fig. 1,2), and a historical review of echinoid records from localities near Flallembaye is presented (Table 1). To date, 28 species have been recorded, seven of which belong to four orders of regulars and 21 to three orders of irregulars. All species are illustrated. The cassidulid Oolopygus pyriformis and the holasterid Cardiaster granulosus are the commonest, while three species are represented by single specimens only. Several species which are rare elsewhere (Cardiaster rutoti, Cardiaster sp., Hemipneustes oculatus en Leymeriaster eluvialis), are relatively common in the flint eluvium near Hallembaye. The stratigraphical provenance of most species is now roughly known (Table 2); future research should provide more detailed data. Comparison of the Hallembaye eluvium with the wellknown eluvium in the southeastern part of Southeren Limburg shows that it is both richer in echinoids species (28 versus 20 species) and slightly younger.