Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Kwave kune kuwanwa kuviri bedzi kwakanyorwa kwezvicherwa zveguruva romumadhaka. Mushakabvu J. Alan Holman, nyanzvi yezvinyorwa zvemhuka uye nyanzvi yezvinyorwa zvemhuka, ndiye akatanga kuzivisa zvisaririra zvepurasitiki zvepurasitiki muCumberland Cave, Maryland (pedyo neCorriganville), iyo iri yezera reIrvingtonian (kubva pamamiriyoni 1,8 kusvika kumakore mazana matatu ezviuru apfuura). Kuwana kwechipiri kwakanga kuri kwezvikamu zveRancholabrean (pakati pemakore 300 000 ne11 000 akapfuura) muGiant Cement Quarry muSouth Carolina (pedyo neHarleyville), naBentely naKnight muna 1998.  Mubvunzo: Alan Holman aiva nemazita api maviri?
nyanzvi yezvipembenene uye nyanzvi yezvipembenene