<p>An elongate flint concretion from the Maastrichtian chalk of Rügen Island is described. It conforms to a large firmground burrow, in which lithoclasts (i.e., fossiliferous chalk) and bioclasts (i.e., isolated fossils) are preserved in a chalky matrix in form of a debris-flow deposit. This tubular debrite (new term) became the locus for preferential silicification. The trapped sediment infill evidence bypass of sediment related to redeposition due to slope failure probably caused by bottom-current induced erosional processes. The new finding is interpreted and discussed in relation to the regional tectonic development, hydrodynamic effects and redeposition phenomena. Accordingly, and in conjunction with the geological context, it is assumed that a significant submarine high was formed as a result of tectonic uplift. The uplifted area was exposed to both light as indicated by traces of algal rhizoids and sediment winnowing by bottom currents. This submarine elevation is identified as source area for debris flows. The flint fabric preserves the earliest known redeposition event within the chalk succession of Rügen.</p>