Cretaceous flint from Rijckholt-St.Geertruid mine : 2D documentation Upper Cretaceous (Maastrichtian)
Cretaceaous flint from Brzoza village : 3D documentation Upper Cretaceous
Cretaceaous flint from Brzoza village : 2D documentation Upper Cretaceous
Cretaceous flint from Rijckholt-St.Geertruid mine : 3D documentation Upper Cretaceous (Maastrichtian)