- fab ric ▁by ▁L ister ▁& ▁S no ke ▁( 1 9 8 4 ). ▁ ▁Form ation ▁of ▁the ▁structure ▁ ▁Ob lique ▁fol iation ▁is ▁a ▁fabric ▁that ▁has ▁achieved ▁a ▁steady ▁state , ▁but ▁does ▁not ▁represent ▁the ▁total ▁accum ulated ▁stra in . ▁▁ ▁The ▁structure ▁is ▁thought ▁to ▁result ▁from ▁the ▁inter play ▁of ▁pass ive ▁fl atten ing ▁and ▁rotation ▁of ▁gra ins ▁in ▁a ▁non - co ax ial ▁flow ▁field ▁on ▁one ▁hand ▁and ▁gra in ▁boundary ▁migration ▁destroy ing ▁the ▁developing ▁shape ▁fabric ▁at ▁the ▁same ▁time ▁on ▁the ▁other ▁hand . ▁The ▁she aring ▁de formation ▁therefore ▁is ▁responsible ▁for ▁align ing ▁the ▁gra ins ▁with ▁the ▁maximum ▁extension ▁direction ▁of ▁the ▁increment al ▁stra in ▁elli ps oid ▁( the ▁instant aneous ▁stretch ing ▁axes ▁or ▁I SA ), ▁whereas ▁the ▁process ▁of ▁dynamic ▁rec ry st all isation ▁oppos es ▁this ▁by ▁forming ▁new ▁equ id im ensional ▁gra ins ▁free ▁of ▁stra in ▁( by ▁gra in ▁boundary ▁migration ); ▁in ▁order ▁to ▁achieve ▁stra in - free ▁gra ins , ▁a ▁part ▁of ▁the ▁developing ▁shape ▁fabric ▁simultaneously ▁must ▁be ▁destroyed . ▁▁ ▁Hence , ▁during ▁progress ive ▁de formation , ▁the ▁fol iation ▁remains ▁relatively ▁station ary ▁in ▁orientation ▁with ▁respect ▁to ▁the ▁kin ematic ▁frame ▁of ▁reference . ▁Another ▁consequence ▁is ▁that ▁the ▁orient ations ▁of ▁an ▁ob lique ▁fol iation ▁generally ▁lag ▁behind ▁the ▁attitude ▁of ▁the ▁total ▁stra in ▁elli ps oid . ▁The