Qhov kev paub ntxov tshaj plaws hauv North America tau pom. Paisley Tsib Mile Point Qhov tsua nyob rau yav qab teb Oregon, ze ntawm Fremont-Winema National Forest, tau raug muab tso rau hauv cov npe ntawm cov chaw qub txeeg qub teg tseem ceeb tshaj plaws hauv Tebchaws Meskas los ntawm United States Park Service nyob rau hauv txoj cai ntawm National Historic Preservation Act. ntawm 1966.
Txij li thaum xyoo 1938, lub qhov tsua tau ua qhov chaw tseem ceeb hauv archaeological, tab sis nrog kev tawg ntawm cov pa roj carbon monoxide thiab lwm yam thev naus laus zis, lub vev xaib txuas ntxiv muab cov kev tshawb pom tshiab.
Archaeologist Dr. Luther Cressman, hu ua "Leej Txiv ntawm Oregon Archaeology thiab Anthropology," tau pib ua haujlwm hauv Paisley Qhov tsua thaum xyoo 1930s thiab kav mus txog rau xyoo 1960, raws li Oregon Encyclopedia.
Nws tau pab tsim lub chaw saib xyuas kev noj qab haus huv ntawm University of Oregon thiab yog thawj tus thawj coj ntawm qhov yuav dhau los ua Oregon State Tsev khaws puav pheej ntawm Anthropology.
Ua ntej Cressman txoj haujlwm tseem ceeb tshaj plaws, cov kws tshawb fawb ntseeg tias cov neeg nyob hauv North America yog cov neeg Clovis uas txawv cov spearheads sau lawv qhov chaw nyob.
National Geographic hais tias thawj zaug ntseeg tias cov neeg nyob hauv North America thaum ub tau tsiv teb tsaws chaw los ntawm Asia txog kaum peb txhiab xyoo dhau los, tab sis raws li Michael Waters, tus thawj coj ntawm Lub Chaw rau Kev Kawm ntawm Thawj Neeg Asmeskas ntawm Texas A&M University, pov thawj ntawm tib neeg txoj hauj lwm ua ntej Clovis kab lis kev cai tau pom nyob rau hauv ntau qhov chaw.
Nyob rau hauv 2002, Dr. Dennis L. Jenkins, archaeologist thiab Field School Supervisor rau Oregon State Tsev khaws puav pheej ntawm Anthropology ntawm University of Oregon, thiab nws cov tub ntxhais kawm pib rov ntsuam xyuas lub qhov tsua tshawb los ntawm Cressman, thiab, nyob rau hauv 2008, qhia tias tib neeg DNA nyob rau hauv. coprolites (feces) hnub tim ntawm 14,000 thiab 15,000 xyoo dhau los tau pom ua rau lawv ntseeg tias tib neeg tau nyob hauv Asmeskas tsawg kawg ib txhiab xyoo ua ntej cov neeg Clovis thiab thawj cov tib neeg tuaj nyob rau sab qaum teb Asia es tsis yog Africa.
Pab neeg no tau sim cov av, pob zeb, thiab cov xuab zeb sib cais nrog rau obsidian thiab cov pob txha cov khoom tawg, cov hlua sage thiab nyom threads, txiav cov pob txha tsiaj, ntoo pegs, thiab cov khib nyiab pov tseg ntawm qhov hluav taws kub nrog rau Pleistocene tsiaj pob txha.
Tib neeg cov quav uas desiccated tau suav tias yog qhov tseem ceeb tshaj plaws nrhiav tau thiab raug xa mus rau Dr. Eske Willerslev, Tus Thawj Coj ntawm University of Copenhagen's Center of Excellence GeoGenetics.
Nws tau tshawb pom tias cov qauv no suav nrog tib neeg mitochondrial DNA los ntawm cov neeg yav dhau los paub tias tau tsiv los ntawm Asia mus rau Asmeskas, nrog rau ntau hnub xov tooj cua calibrated mus rau ntau tshaj kaum plaub txhiab xyoo dhau los, predating qhov qub Clovis qhov chaw tshaj li ib txhiab xyoo.
Lwm tus tau nug txog qhov raug cai ntawm qhov kev tshawb pom vim yog kev ua haujlwm ua ntej los ntawm Cressman thiab lwm tus tau ceeb toom tias cov deposits tsis tau pom nyob rau hauv situ (lawv qhov chaw qub) thiab tej zaum yuav kis tau kab mob.
Kev tshawb fawb ntxiv ua tiav xyoo 2009 pom cov cuab yeej pob txha serrated uas predated cov neeg Clovis, thiab kev soj ntsuam ntawm coprolites tau lees paub.
