he ur ▁Tour ▁- ▁Live ▁à ▁Ber cy ▁ ▁Notes ▁ ▁Category : 2 0 1 2 ▁albums ▁Category : M . ▁Pok ora ▁albums <0x0A> </s> ▁The ▁Bah ari ya ▁Form ation ▁( also ▁trans cribed ▁as ▁Bah ar ija ▁Form ation ) ▁is ▁a ▁foss il ifer ous ▁ge olog ic ▁formation ▁d ating ▁back ▁to ▁the ▁early ▁C en oman ian , ▁which ▁out cro ps ▁within ▁the ▁Bah ari ya ▁de pression ▁in ▁Egypt , ▁and ▁is ▁known ▁from ▁oil ▁expl oration ▁dr illing ▁across ▁much ▁of ▁the ▁Western ▁Des ert ▁where ▁it ▁forms ▁an ▁important ▁oil ▁res er voir . ▁ ▁Ext ent ▁ ▁The ▁Bah ari ya ▁Form ation ▁forms ▁the ▁base ▁of ▁the ▁de pression , ▁the ▁lower ▁part ▁of ▁the ▁en clos ing ▁esc arp ment ▁ ▁and ▁all ▁of ▁the ▁small ▁hills ▁within . ▁The ▁type ▁section ▁for ▁the ▁formation ▁is ▁found ▁at ▁Geb el ▁El - Dist , ▁a ▁hill ▁at ▁the ▁northern ▁end ▁of ▁the ▁Bah ari ya ▁de pression . ▁ ▁Str at ig raph y ▁and ▁sed iment ology ▁ ▁Four ▁depos itional ▁sequences ▁have ▁been ▁recogn ised ▁in ▁the ▁Bah ari ya ▁Form ation ▁in ▁the ▁Bah ari ya ▁de pression , ▁separated ▁by ▁three ▁sub - a er ial ▁un con form ities . ▁The ▁formation ▁was ▁depos ited ▁during ▁a ▁period ▁of ▁relative ▁rise ▁in ▁sea ▁level , ▁with ▁each ▁un con form ity ▁representing ▁a ▁relative ▁fall ▁in ▁sea ▁level . ▁Each ▁of ▁the ▁individual ▁sequences