Koguna masu launin ruwan kasa

Bluefish Caves wuri ne na binciken kayan tarihi a Yukon, Kanada, yana  kudu maso yammacin al'ummar Vuntut Gwichin na Old Crow .  An ba da shawarar cewa aikin ɗan adam ya kasance zuwa shekaru 24,000 Kafin Zuwan (BP) dangane da yanayin radiyo na ragowar dabbobi,  amma waɗannan kwanakin suna hamayya saboda yanayin yanayin da ba a san shi ba na ragowar archaeological dangane da ragowar dabbar da aka haifa.   Akwai ƙananan kogo guda uku a yankin. 

 Magana 
Kogon Bluefish da farko an san shi ga ƙasashen farko na gida, amma wani balaguron kamun kifi ya shahara a shekarar 1976, daga baya kuma ta hanyar masu bincike. Wannan  yana da ƙananan kogo guda uku, daga    .  Kogon farko ya kunshi kasusuwan dabbobi iri-iri wadanda ake ganin mahara ne suka ja su zuwa wurin; binciken da aka yanke na iya nuna kasancewar mutum. 

Tsohon Crow Flats, wani yanki mai mahimmanci tare da kasancewar ɗan adam na farko, yana kusan 75 km arewa maso gabas na Bluefish Caves. 

 Dating 
Masanin ilimin kimiya na kayan tarihi Jacques Cinq-Mars ne ya tono wurin a tsakanin 1977 zuwa 1987, kuma farkon lokacin da aka fara aikin rediyo ya nuna shekaru 24,000 kafin yanzu (BP).  An yi la'akari da wannan rikice-rikice kamar yadda ya bambanta da ka'idar Clovis-First, wanda masana kimiyya suka yarda da su a lokacin, wanda yayi la'akari da kwanan wata yarjejeniya ta Arewacin Amirka a kusa da 13,000 BP.  Wani bita na shafin a cikin 2017 ya gano cewa yana da shekaru 24,000,  yana ba da tallafi ga ma'anar "tsayin Beringian" - cewa kakannin 'yan asalin ƙasar Amirka sun shafe lokaci mai tsawo a cikin mafaka na Beringian a lokacin Glacial Maximum na Ƙarshe kafin su mamaye Amurka.  Wani takarda daga baya ya yi tambaya game da jima'i (dangane da rikice-rikicen da'awar) da kuma al'adun faunal ya rage,  amma goyon bayan binciken 2017 ya sake maimaita ta marubucin wannan rahoto. 

 Manazarta