▁ab rupt ▁s lop es . ▁The ▁whole ▁area ▁is ▁incl ined ▁south ▁toward ▁and ▁beyond ▁the ▁Columbia ▁River . ▁There ▁may ▁have ▁been ▁a ▁c inder ▁cone ▁between ▁Green leaf ▁Pe ak ▁and ▁Table ▁Mountain ▁which ▁col lapsed ▁during ▁the ▁B onne ville ▁S lide . ▁ ▁The ▁prop ens ity ▁of ▁the ▁area ▁south ▁of ▁Green leaf ▁Pe ak ▁and ▁Table ▁Mountain ▁to ▁collapse ▁in ▁land sl ides ▁is ▁due ▁to ▁the ▁E agle ▁Creek ▁formation . ▁The ▁rocks ▁of ▁the ▁formation ▁cover ▁approximately ▁ ▁of ▁the ▁Columbia ▁River ▁G orge ▁east ▁of ▁Cape ▁Horn ▁and ▁consist ▁of ▁a ▁mixture ▁of ▁past ▁land sl ides , ▁vol can ic ▁mud ▁flows ▁and ▁ash ▁falls . ▁The ▁formation ▁is ▁to pped ▁with ▁bas alt . ▁Water ▁can ▁per col ate ▁through ▁the ▁bas alt ▁and ▁s atur ate ▁the ▁E agle ▁Creek ▁formation . ▁In ▁places ▁where ▁the ▁formation ▁is ▁relatively ▁close ▁to ▁the ▁surface ▁and ▁incl ined ▁down s lo pe , ▁such ▁as ▁near ▁Green leaf ▁Pe ak ▁and ▁Table ▁Mountain , ▁water ▁s atur ation ▁can ▁cause ▁the ▁formation ' s ▁material ▁to ▁slide ▁away , ▁carrying ▁the ▁over lying ▁bas alt ▁with ▁it . ▁ ▁Between ▁Green leaf ▁Pe ak ▁and ▁Table ▁Mountain , ▁and ▁above ▁the ▁Red ▁Bl uff s , ▁lies ▁Green leaf ▁Bas in . ▁The ▁bas in ▁aver ages ▁ ▁in ▁elev ation ▁and ▁is ▁covered ▁with ▁for ested ▁wet lands . ▁Green leaf ▁Creek ▁flows ▁south ▁through ▁the ▁bas in ▁before ▁pl ung