The Petřkovice Member (Ostrava Formation, Mississippian) of the Upper Silesian Basin (Czech Republic and Poland)

► Complete determinations of Petřkovice Member and Sarnów Beds ► First complete maps of thickness, sand content and coal bearing capacity ► Thickness 50 to 770 m, sand content 23 to > 90% ► Total coal bearing capacity locally over 25 m ► 3 zones of different basin's bedrock mobility were detected.