The wonder of the Bamu overturning northeast of Shiraz, Iran

Document Type: Original Article


1 Department of Geology, Zahedan Branch, Islamic Azad University, Zahedan, Iran

2 Department of Geology, Faculty of Science, Islamic Azad University - Shiraz Branch, Shiraz, Iran

3 Department of Geology, Faculty of Basic Science, Shiraz University, Shiraz, Iran


It has been amazing that the Bamu anticline located to the north of Shiraz city and in the simply folded belt of the Zagros mountain ranges, displays overturning layers, so that the oldest outcropped layer, i.e. the Tarbur Formation, lies on the top of other younger formations. According to Haynes and McQuillan, (1976), the imbricate zone of the Zagros mountain ranges includes the Bamu anticline. This is not true, because the Rahmat anticline, located 36 km to the north of the Bamu anticline, shows no overturning. The latest models for overturning or thrusting do not satisfy the local requirements. Investigations show another local condition responsible for this phenomenon, namely the displacement of the Sofia anticline, due to a dextral fault.