Świeciechów flint : 3D documentation Turonian
Świeciechów flint : 2D documentation Turonian
Siliceous hypertrophy : 2D documentation Upper Jurassic
Świeciechów flint : 3D documentation Turonian
Chocolate' flint : 2D documentation Upper Jurassic
Banded flint : 3D documentation Upper Jurassic (Oxfordian/Kimmeridgian)