Pre-core Pleistocene, Late Palaeolithic (Alleröd - Younger Dryas, GI-1a - GS-1)
Flint from Spiennes : 3D documentation Maastrichtian
Flint from Spiennes : 2D documentation Maastrichtian
Gray white-spotted flint : 3D documentation Turonian
Gray white-spotted flint : 2D documentation Turonian