BAUSTOFFE SCHOLLBERG AG (Trübbach)

Where once there was a sea About 135 to 160 million years ago, the area of today's Schollberg Quarry was covered by a sea that had a depth of about 1000 meters. On the bottom of the sea, excess lime from the water and shells of small marine animals accumulated in the form of mud over a long period of time.

Due to the overburdening with sediments - thickness 1000 to 1500 meters - the lime mud was solidified into limestone in the course of time. The original horizontal deposition has been preserved in the stratification of the rock to this day. During the alpine mountain building about 10 to 35 million years ago, the consolidated layers broke into large clasts, were pushed over each other, compressed and folded. The Schollberg belongs to the Gonzen-Axen-Decke and forms an uplift fold. In the south, towards the quarry area, the rock layers slope down towards the Rhine valley.

Today, high-percentage limestone is extracted in the underground mining of the Schollberg quarry. In the hand specimen, the very homogeneous and fine-grained formation of the limestone can be recognized. The grain size of the crystals is at most about one five-thousandth of a millimeter. The white veins, which penetrate the rock, consist of calcite. This has healed the cracks that occurred during the formation of the mountains. The sedimentation conditions in the sea at that time, which remained constant for a very long time, resulted in a very homogeneous, fine-grained sediment. The Schollberg owes the large-scale high and constant quality of its rock to this circumstance.