1. Department of Geology, Faculty of Science, Aswan University, Aswan 81528, Egypt
2. Department of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, TX 78712, USA
3. Department of Geology, Faculty of Science, Benha University, Benha 13518, Egypt
4. Institute of Geosciences, University of Kiel, Ludewig-Meyn Str. 10, 24118 Kiel, Germany