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SIMPLIFIED STRATIG RAPHIC COLUMN <br />FORMATION MEMBER THICK DEPTH AQUITARD <br />N 10 B R A R A <br />FORMATION <br />Upper C retace0us <br />:;,?Q::,:::;6:2::t;,V <br />10, <br />10, <br />40 <br />50' <br />S H A L E <br />U p p e r Cretaceous <br />6 <br />56' <br />____ ___ ___ ____ ______l = =k =_ ____ __ -__ _ =_ =___= __= <br />_ ______ _______ _____ _____ _____ ___ <br />7 5 ' <br />1 3 1 ' <br />------------------------------- - - - - -- <br />-------------------------------------- <br />------------------------------------- <br />-------------------------------------- <br />------------------------------------- <br />-------------------------------------- <br />------------------------------------- <br />-------------------------------------- <br />------------------------------------- <br />-------------------------------------- <br />7 5 ' <br />2 0 6 ' <br />G R E E N H O R N <br />L I M E S T O N E <br />U p p e r C r e t a c e o u s <br />50' <br />256' <br />W. <br />bill <br />__ __ _ _ <br />=_ = =d = = -= A = = =`_ - -= _______= = == <br />2 0' <br />2 7 6' <br />40' <br />316' <br />G R A N E R O S <br />S H A L E <br />U p p e r Cretaceous <br />-------------------------------------- <br />-------------------------------------- <br />-------------------------------------- <br />-------------------------------------- <br />-------------------------------------- <br />-------------------------------------- <br />-------------------------------------- <br />-------------------------------------- <br />-------------------------------------- <br />_ = =_ = =C __JAC== i�f = =_ =# <br />______ ________________ <br />1 4 0' <br />4 5 6' <br />D A K O T A <br />S A N D S T O N E <br />Lower Cretaceous <br />....... ............................... <br />....... ............................... <br />....... ............................... <br />...... ............................... <br />....... ............................... <br />....... ............................... <br />...... ............................... <br />.. P:..— <br />S ANDS <T.O N E rr <br />1 00' <br />556' <br />OR::a:`.:�RE,�K <br />S::A.:N.'D:S::T.0. N :E '! <br />>Lt tt ER SS <br />20' <br />