Contents Volume 4 Exposed sedimentary bedrocks in pyramids... Another study in Environmental Geoegyptology Soliman M. Soliman Ore minerals in Nile (Alluvial) placer gold, Aswan High Dam reservoir, Egypt Mahmoud M. Hassaan, M. ElDardir, A.M. Sanad, I. ElKashif and M.Y. Hassaan Diagenetic trends in Quaternary coral reef terraces, Ras Mohammed-Sharm ElSheikh Coast, Southern Sinai, Egypt Hesham M. ELAsmar and G.M. Attia Talus Pleistocene red breccia. Occurrence and origin, Sohag area, Egypt Ramadan K. Bekir Sedimentary and chemical nature of Recent sabkhas, central part of Red Sea coastal zone, Egypt Mahmoud M. Hassaan, I Hassanein, A. Abu ElEzz and A. Mousa Sedimentary and technologic characteristics of bentonitic clays from Gebel Hamza, NE Cairo, Egypt Gamal M. Attia Neogene clayey deposits. Minerals and sedimentary implications, Red Sea, Egypt Ramadan K. Bekir and Abdulla M. Hassan Hammam Faraun carbonate sedimentation, Shoab Ali field, Egypt: Isotopic and petrographic study Oussama M. El Badry and Omar E. Aiuob Contact zone between Miocene carbonate and anhydrite beds, Gemsa borehole No. 1, Gulf of Suez, Egypt Gamal M. Attia Paragenesis in carbonate intercalations within Phosphorite sequence, Kharga-Dakhla Oases, Egypt Samir A. Awad and H. H. AlOtaib