1. The fault zones are marked by a zone of sheared rocks characterized by mylonite . 2. Mylonite development, biotitization, chloritization and microgranulation are found associated with these surfaces.3. They contain pumices of various colours and lithic fragments, including mylonite and schist. 4. At depth, the angular breccias transit into a ductile shear texture and into mylonite zones. 5. Cataclasites or pseudotachylite breccias with mylonite clasts are common, as are ductily deformed cataclasites and pseudotachylites. 6. Here, deformation forms mylonite , with dynamothermal metamorphism observed rarely as the growth of porphyroblasts in mylonite zones. 7. Here, deformation forms mylonite, with dynamothermal metamorphism observed rarely as the growth of porphyroblasts in mylonite zones. 8. Isotopic dating of shale mylonite in Pennsylvania reveals a K-Ar age of 372 + /-8 Ma. 9. To the north follows a 10 centimeter wide band of white, powdery mylonite very rich in pyromorphite and crocoite. 10. Gneissic texture may occur nearby, if not then mylonite zones, foliations and ductile behaviour, including stretching lineations may occur.
