El Samra area in southeastern Sinai is occupied by Dokhan volcanic and Hammamat sediments. The Dokhan volcanic separated into (a) older Dokhan volcanic of intermediate compositions, and (b) younger Dokhan volcanic of rhyolitic composition. The two subunits are separated by a time interval of considerable magnitude during which deposition of the Hammamat sediments. The volcanic-sedimentary succession intruded by high level ... Read more