CACTUS CRATER ann XC-1 “a Keps ¥ fo2£8s f f — eS ono TG zt} Kees ¥ j = worn dt!” 50 _ a oe ene qe ee Gee ¥T "100 =~ ares wee ee ee 50 feet SO feet 150 Viewed - Looking Nosthesst 7 —————— Past-chot Crates ———— ~ True Crater (?) ---=——— Solution Unconformity FIGURE 5 Well logs of gamma radiation (expressed as K cps) from dritl holes XC-? and XC-2 beneath Cactus Crater (Ristvet 1980). The true crater may be defined by polnts. where Increased activities occur beneath the fallback materfal In the crater.