Tabular chert of the Baiersdorf-type : 2D documentation Tithonian/Upper Jura
Tabular chert of the Baiersdorf-type : 3D documentation Tithonian/Upper Jura
Abilly la Claisière : 2D documentation Turonian
Chocolate' flint : 3D documentation Upper Jurassic
Chocolate' flint : 2D documentation Upper Jurassic
Abilly la Claisière : 3D documentation Turonian