▁due ▁to ▁this ▁high ▁depth , ▁it ▁would ▁be ▁extremely ▁difficult ▁to ▁collect ▁foss ils ▁from ▁there , ▁and ▁currently ▁the ▁only ▁known ▁foss ils ▁from ▁this ▁str ata ▁are ▁ost rac ods ▁collected ▁from ▁deep ▁well ▁cores . ▁ ▁C ret ace ous ▁For ▁intervals ▁of ▁time ▁during ▁the ▁C ret ace ous ▁the ▁state ▁was ▁once ▁more ▁sub mer ged ▁under ▁se aw ater . ▁Local ▁o yst ers ▁left ▁behind ▁remains ▁that ▁would ▁later ▁foss il ize . ▁Are as ▁of ▁the ▁state ▁not ▁sub mer ged ▁by ▁the ▁sea ▁were ▁home ▁to ▁din osa urs . ▁About ▁ 7 5 ▁million ▁years ▁ago , ▁during ▁the ▁C ret ace ous , ▁the ▁Black ▁Creek ▁Form ation ▁( more ▁properly ▁called ▁the ▁Don oh o ▁Creek ▁Form ation ) ▁was ▁being ▁laid ▁down ▁in ▁southern ▁North ▁Carolina . ▁The ▁area ▁was ▁most ▁likely ▁an ▁est u ar ine ▁environment , ▁jud ging ▁from ▁foss ils ▁found ▁there . ▁Din osa urs ▁were ▁part ▁of ▁the ▁state ' s ▁fa una ▁at ▁the ▁time . ▁In ▁fact , ▁this ▁unit ▁is ▁the ▁primary ▁source ▁of ▁the ▁state ' s ▁din osa ur ▁foss ils . ▁Din osa urs ▁found ▁in ▁the ▁state ▁include ▁the ▁orn ith om im id ▁Co el osa urus ▁anti qu us , ▁the ▁had ros aur ids ▁Hy ps ib ema ▁cr ass ica uda ▁and ▁( poss ibly ) ▁Had ros aur us , ▁an ▁ind et erm inate ▁ty ran nos au roid ▁(