Kukhazikika koyambirira kodziwika ku North America kwapezeka. Mapanga a Paisley Five Mile Point kum'mwera kwa Oregon, pafupi ndi nkhalango ya Fremont-Winema National Forest, awonjezedwa mwalamulo pamndandanda wamalo ofunikira kwambiri ofukula zinthu zakale ku United States ndi United States Park Service motsogozedwa ndi National Historic Preservation Act. cha 1966.
Kuyambira m'chaka cha 1938, mapangawa akhala malo otchuka kwambiri ofukula zinthu zakale, koma ndi kupambana kwa carbon dating ndi matekinoloje ena, malowa akupitirizabe kupereka zatsopano.
Katswiri wofukula mabwinja Dr. Luther Cressman, yemwe amadziwika kuti "Bambo wa Oregon Archaeology ndi Anthropology," anayamba kugwira ntchito ku Paisley Caves kumapeto kwa zaka za m'ma 1930 ndipo anakhalapo mpaka 1960s, malinga ndi The Oregon Encyclopedia.
Anathandizira kukhazikitsa dipatimenti ya anthropology ku yunivesite ya Oregon ndipo anali mtsogoleri woyamba wa zomwe zikanakhala Oregon State Museum of Anthropology.
Asanayambe ntchito yaikulu ya Cressman, asayansi ankakhulupirira kuti anthu oyambirira a ku North America anali a Clovis People omwe mitu yawo yosiyanitsa imalemba malo awo okhala.
National Geographic imanena kuti poyamba ankakhulupirira kuti anthu akale a ku North America anasamuka unyinji kuchokera ku Asia pafupifupi zaka zikwi khumi ndi zitatu zapitazo, koma malinga ndi kunena kwa Michael Waters, mkulu wa Center for the Study of the First Americans pa Texas A&M University, umboni wa zimenezi. kulanda anthu chikhalidwe cha Clovis chisanapezeke m'malo ambiri.
Mu 2002, Dr. Dennis L. Jenkins, akatswiri ofukula zinthu zakale ndi Field School Supervisor wa Oregon State Museum of Anthropology ku yunivesite ya Oregon, ndipo ophunzira ake anayamba kufufuzanso mapanga omwe adafufuzidwa ndi Cressman, ndipo, mu 2008, adanena kuti DNA yaumunthu mu coprolites (ndowe) za zaka zapakati pa 14,000 ndi 15,000 zapitazo zinapezedwa zikuwapangitsa kukhulupirira kuti anthu analipo ku America pafupifupi zaka chikwi anthu a Clovis asanabadwe ndi kuti anthu oyamba anachokera kumpoto chakum’maŵa kwa Asia osati Afirika.
Gululo linayesa dothi, miyala, ndi mchenga padera komanso zidutswa za zida za obsidian ndi fupa, chingwe cha sage ndi ulusi wa udzu, mafupa a nyama odulidwa, zikhomo zamatabwa, ndi zinyalala zomwe zinatsala ku maenje amoto pamodzi ndi mafupa a nyama a Pleistocene.
Zonyansidwa za anthu zochotsedwa zinkaonedwa kuti ndizofunikira kwambiri ndipo zinatumizidwa kwa Dr. Eske Willerslev, Mtsogoleri wa University of Copenhagen's Center of Excellence GeoGenetics.
Anapeza kuti zitsanzozo zinaphatikizapo DNA ya mitochondrial yaumunthu kuchokera kwa anthu omwe kale ankadziwika kuti adachoka ku Asia kupita ku America, komanso masiku angapo a radiocarbon omwe adawerengedwa zaka zoposa zikwi khumi ndi zinayi zapitazo, asanakhale malo akale kwambiri a Clovis zaka zoposa chikwi.
Ena amakayikira kuvomerezeka kwa zomwe anapezazo chifukwa cha ntchito yoyamba yomwe Cressman ndi ena adachita pozindikira kuti madipozitiwo sanapezeke mu situ (malo awo oyamba) ndipo mwina adayipitsidwa.
Kafukufuku wowonjezereka wochitidwa mu 2009 adapeza chida cha mafupa omwe adakhalapo kale anthu a Clovis, ndipo kusanthula kwa coprolites kunatsimikiziridwa.
