Knowledge Bank

A ground-derived total intensity magnetic map of the Suffield fault, a western extension of the Transylvania fault zone, suggests a fault with a southwest dip of 80° or greater. Displacement history is uncertain, but may involve significant right-lateral wrenching at the time of early fault development. Subsequent movements may include normal faulting. Although principal fault movement is Permo- Pennsylvanian, displacement at the level of the Precambrian surface, inferred from the magnetic map, suggests significant Cambro-Ordovician faulting. Subsurface distribution patterns of Silurian to Mississippian units define minor syndepositional fault movements during accumulation of the Silurian Salina salts and again during deposition of the Mississippian Berea sands.