▁was ▁a ▁mic rop ale ont ologist ▁and ▁strat ig raph er ▁best ▁known ▁for ▁his ▁innov ative ▁work ▁on ▁the ▁application ▁of ▁pl ank ton ic ▁for amin if era ▁to ▁world wide ▁strat ig raph ic ▁correlation . ▁His ▁work ▁was ▁based ▁on ▁the ▁micro fa una ▁and ▁strat ig raph y ▁of ▁South ▁America , ▁especially ▁as ▁related ▁to ▁pet role um ▁ge ology . ▁▁ ▁Born ▁in ▁King ston - up on - H ull ▁in ▁East ▁York shire , ▁St ain for th ▁studied ▁at ▁the ▁Royal ▁School ▁of ▁M ines ▁in ▁London , ▁where ▁he ▁earned ▁a ▁‘ B ach elor ▁of ▁Science ▁in ▁the ▁Technology ▁of ▁O il ’ ▁in ▁ 1 9 3 8 . ▁Upon ▁gradu ation ▁he ▁was ▁offered ▁a ▁position ▁as ▁a ▁pale ont ologist ▁at ▁Po inte - à - Pierre ▁in ▁Tr in idad ▁working ▁for ▁Tr in idad ▁Le ase holds ▁Ltd . ▁Those ▁working ▁at ▁the ▁labor atory , ▁including ▁St ain for th , ▁had ▁a ▁great ▁influence ▁on ▁the ▁study ▁of ▁strat ig raph y ▁in ▁the ▁years ▁that ▁followed . ▁The ▁management ▁of ▁the ▁company , ▁encourag ed ▁by ▁Dr . ▁Hans ▁K ug ler ▁and ▁a ▁succession ▁of ▁Chief ▁Ge olog ists , ▁allowed ▁a ▁gener ous ▁publication ▁policy , ▁not ▁always ▁the ▁case ▁in ▁industry ▁but ▁und ou bt edly ▁good ▁for ▁the ▁adv ancement ▁of ▁science . ▁ ▁In ▁the ▁years ▁after ▁ 1 9 4 5 ▁St ain for th ▁worked