antiformai stacks frprf'Sf'nts an inVf'fSion of prf'-f"xistent f"xtensionai faults whi('h formt'd half-~rabpn ~t'onH'lries. Thp basenlPnl ro('ks im olwd in thp structurI' rI'prt'st'nl short-culs fornwd in th!' foolwall of Iht' t'xlpnsional faults. All thrusts of La Carrotxa I:lrf'a branch with thp UppPf Garrotxa thrust. Thl' mort-' complex structure of La Garrotxa area than the adjac('nt areas within thp Cadi unit. is duf' to the initial complf'x synst'dimentary ~f'omf'lry of the sedimentary pile, TIlt' Cadi unil ov!'rlips Ilw Sprral unil wilh a hanging"all ramp geomet~. This unil was d .. dll(,pd from Ihe Sprrat-1 well. drilled in 1 lIB,. Thp Sf'rrat unit is made lip or a \liddlr Eoernr p\l:lporiti(' s('qUf'n('f'l with altprnalin~ shall'S and anhydrilps and a 100 mt'lers Ihi('k salt layer dosp 10 Ihe 101'. Th., lotal Ihi('kness of this !'vaporiti(' Beuda sequ!'rH'" is 1 000 mel!'rs. Thl' Belula sl'quen('e clearl~ I'onlrolled the thrusI geomel~ of the ~ounJ!pr thrusts.
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