Somalia also well established, with many local "jama'a" ("zawiya") or congregations of the various "tariiqa" or Sufi orders. The constitution of Somalia likewise defines Islam as the state religion of the Federal Republic of Somalia, and Islamic sharia as the basic source for national legislation. It also stipulates that no law that is inconsistent with the basic tenets of Shari'a can be enacted. Islam entered the region very early on, as a group of persecuted Muslims had sought refuge across the Red Sea in the Horn of Africa at the urging of the Islamic prophet Muhammad. Islam may thus have been
Geology of Somalia and island arcs. In the Early Jurassic, the supercontinent Gondwana, which included Africa, began to break apart. The marine transgression of the Tethys Ocean flooded large parts of East Africa and Arabia and new sedimentary rock units were deposited. In the west of Somalia, the Cretaceous at the end of the Mesozoic brought crustal upwarping, which is preserved in the Yesomma Sandstone. Two major sedimentary basins began to form in Somalia during the Mesozoic, the Somali Coastal Basin and the Luuq-Mandera Basin, both filled with up to five kilometers of sedimentary rock. The basins formed due to the movements of