Ka taƙaita labarin:  Masana ilimin kimiyyar kayan tarihi sun gano kayan aikin dutse a Oregon wanda ke nuna cewa mutane sun mamaye yammacin Amurka da wuri fiye da yadda ake tsammani. An gano kayan aikin agate a karkashin wani kauri mai kauri na toka mai aman wuta wanda ya koma lokacin fashewar Dutsen St Helens shekaru 15,800 da suka gabata. Masana kimiyya sun yi imanin cewa wuka mai mahimmanci, wanda aka gano 12ft (3.6 mita) a ƙasa, an yi amfani dashi don yankan dabbobi, yankan nama, da kuma sassaƙa itace ta mutanen pre-Clovis. Masana ilimin kimiyyar kayan tarihi sun gano kayan aikin dutse a Oregon wanda ke nuna cewa mutane sun mamaye yammacin Amurka da wuri fiye da yadda ake tsammani. An gano kayan aikin agate ne a karkashin wani kauri na toka mai aman wuta wanda ya koma lokacin fashewar Dutsen St Helens shekaru 15,800 da suka gabata. Gano, a Rimrock Draw Rockshelter, an sanar da shi a yau ta Ofishin Gudanar da Ƙasa na Amurka, wanda ke kula da ƙasar da aka samo shafin. Masanin kimiyyar kayan tarihi Scott Thomas ya ce idan aka bincika shekarun wannan yankin, zai zama mafi tsufa kafin zamanin Clovis da aka samu a yammacin Dutsen Rocky. Zai kuma kasance ya girme wani wanda ya riga wanda ake kira al'adun Clovis, wanda a dā ana zaton mutane ne na farko da suka ƙaura daga Asiya zuwa Amirka ta Arewa. Abubuwa na dā na Clovis, da aka sani da duwatsu masu kyau, an rubuta su shekaru 13,000 da suka shige. Farfesa Patrick O'Grady daga Jami'ar Oregon ya kira wannan binciken'mai ban sha'awa.' Gano, a Rimrock Draw Rockshelter, an sanar da shi a yau ta Ofishin Gudanar da Ƙasa na Amurka, wanda ke kula da ƙasar da aka samo shafin. Masanin ilimin kimiyyar kayan tarihi Scott Thomas ya ce idan shekarun yankin ya tsaya ga bincike, zai zama mafi tsufa a yammacin Rocky Mountains. Amma ya kara da cewa suna son ci gaba da tono wannan bazara don ganin ko toka mai aman wuta ta rufe dukkan yankin. Donald Grayson, farfesan ilimin kimiyyar kayan tarihi a Jami'ar Washington, ya ce masana kimiyya za su kasance da shakka. An rubuta wurare biyu kafin zamanin Clovis da kyau kuma masana kimiyya sun yarda da su. Ɗaya shi ne Paisley Cave, wanda ke da nisan mil 60 a kudu maso yammacin wurin Rimrock. Na biyun kuma Monte Verde ne a Chile. Dukansu biyu...
An gano kayan aikin agate a karkashin wani nau'i mai yawa na ash ash. An yi amfani dashi don yankan fata, yankan nama, da sassaƙa itace. An samo shi ne a Rimrock Draw Rockshelter a kudu maso gabashin Oregon. Idan kwanan Rimrock ya tsaya, zai sanya mutane a shafin kimanin shekaru 1,500 da suka gabata da suka yi tunani, a ƙarshen zamanin Pleistocene.