9 ▁death s ▁Category : Pe ople ▁from ▁Pet ral ia ▁S ott ana ▁Category : Ital ian ▁racing ▁drivers ▁Category : World ▁Sport scar ▁Championship ▁drivers <0x0A> </s> ▁The ▁J avel ina ▁Form ation ▁is ▁a ▁ge ological ▁formation ▁in ▁Texas . ▁D ating ▁has ▁shown ▁that ▁the ▁str ata ▁date ▁to ▁the ▁Ma astr icht ian ▁stage ▁of ▁the ▁Late ▁C ret ace ous , ▁approximately ▁ 7 0 ▁to ▁ 6 6 . 5 ▁million ▁years ▁old . ▁The ▁middle ▁part ▁of ▁the ▁formation ▁has ▁been ▁dated ▁to ▁about ▁ 6 9 ▁million ▁years ▁ago ▁plus ▁or ▁minus ▁ 1 ▁Ma ▁and ▁the ▁top ▁situated ▁near ▁the ▁C ret ace ous – P ale ogene ▁boundary ▁( in ▁the ▁over lying ▁Black ▁Pe aks ▁Form ation ), ▁dated ▁to ▁ 6 6 ▁Ma ▁ago . ▁Din osa ur ▁remains ▁are ▁among ▁the ▁foss ils ▁that ▁have ▁been ▁recovered ▁from ▁the ▁formation . ▁ ▁Age ▁The ▁typical ▁age ▁range ▁of ▁the ▁J avel ina ▁Form ation ▁has ▁been ▁difficult ▁to ▁determine . ▁Only ▁one ▁ge ological ▁site ▁in ▁the ▁J avel ina ▁Form ation ▁has ▁thus ▁far ▁yield ed ▁the ▁correct ▁rock ▁types ▁for ▁radi ometric ▁d ating . ▁The ▁out c rop , ▁situated ▁in ▁the ▁middle ▁str ata ▁of ▁the ▁formation ▁about ▁ 9 0 ▁meters ▁below ▁the ▁K - P g ▁boundary ▁and ▁within ▁the ▁local ▁range ▁of ▁Al am osa urus ▁foss ils ▁and ▁below ▁two ▁sites ▁that ▁have ▁yield ed ▁Qu etz al co at lus