story: Dan was digging in his yard to put in an extension to his home. He wasn't very deep when his shovel thudded against Something hard. Suddenly a black stream spewed up into the air! Dan thought he'd struck oil! When he sniffed the air he realized he'd struck a sewage pipe.
 selected sentence: Dan thought he'd struck oil!
Dan thought he had struck oil >Causes/Enables> Dan sniffed the substance to find it's sewage 