Mu July 1889, munthu wamng'ono anafukulidwa pa ntchito yoboola bwino ku Nampa, Idaho, yomwe inachititsa chidwi kwambiri sayansi m'zaka zapitazi.
Mosakayikira opangidwa ndi manja a anthu, adapezeka mozama (mozungulira 320ft) zomwe zingawoneke kuti zimayika zaka zake kutali ndi kuyembekezera kubwera kwa munthu m'dera lino la dziko lapansi, malinga ndi njira zovomerezeka zachibwenzi. Ngakhale kuti asayansi onse anaiwaliratu, umboniwo, utawonedwa popanda kukondera kwa chisinthiko, umamvekabe kukhala wokhutiritsa patatha zaka zana kuchokera pamene unapezedwa.
“Chidole” chaching’onocho (chotchedwa Nampa Image) chapangidwa ndi theka la dongo ndi theka la quartz, ndipo malinga ndi katswiri mmodzi, Pulofesa Albert A. Wright wa ku Oberlin College, sichinali chopangidwa ndi mwana wamng’ono kapena wosaphunzira, koma anapangidwa ndi wojambula weniweni.
Ngakhale kumenyedwa koyipa ndi nthawi, mawonekedwe a chidole akadali osiyana: ali ndi mutu wa bulbous, osawoneka bwino pakamwa ndi maso: mapewa otakata: manja amfupi, okhuthala: ndi miyendo yayitali, mwendo wakumanja wathyoledwa. Palinso zizindikiro zofooka za geometric pachithunzichi, zomwe zimayimira zovala kapena zodzikongoletsera - zimapezeka kwambiri pachifuwa pakhosi, m'manja ndi m'manja. Chidole ndi chithunzi cha munthu wotukuka kwambiri, wovala mwaluso.
Mosiyana ndi zinthu zakale zakale zaumunthu ndi mafupa omwe amapezeka m'miyala yokhala ndi golidi kumapiri a Sierra Nevada ku California m'zaka zapitazi (Gentet, 1991), Chithunzi cha Nampa chikhoza kukhala chidziwitso chokha cha chitukuko cha mbiri yakale yomwe tsopano yakwiriridwa kwambiri pansi pa nthaka.
Mwachiwonekere, nkovuta kunena kuti Nampa Image ndi umboni wabwino kwambiri wa chitukuko cha anthu akale ku North America. Komabe, umboni wosonyeza kuti Chifaniziro cha Nampa n’chofunika kwambiri. Mkhalidwe wa chojambulacho ukhoza kupereka zovuta kwambiri kwa munthu yemwe ali kumalire koyambirira. Ndipo mpope wamchenga, womwe unkagwira ntchito panthawi yomwe adapeza zinthuzo, samaphatikizapo kuikidwa kuchokera pamwamba panthawi yomwe ikugwira ntchito ndikupulumuka.
Pampu yamchenga yokhala ndi cholumikizira pamwamba ndi yopitilira mainchesi asanu muchipindacho. Pompo yamchenga yoyenera ndi mainchesi 4 1/2 kunja ndipo valavu ndi pafupifupi mainchesi 3 1/2 mkati. Chilichonse choikidwa pamwamba pake chikanayandama pamwamba pa madziwo n’kukhala ufa ndi pompo yamchenga. ― Kagawo ka makalata olembedwa ndi Mark A. Kurtz kwa G. Frederick Wright, a pa November 30, 1889.
Kuwonjezera apo, pamene wina angaganizire cholinga chachinyengo (ngakhale kuti lingaliro lachinyengo lolimbikitsa tawuni yatsopano ya malire silinatchulidwepo ndi wolemba wina aliyense, olembawo anafufuza), anthu okhudzidwa nthawi zonse ankafotokozedwa ngati nzika za msinkhu m'deralo. , ndipo anali okhulupirika kwambiri pa mawu awo.
Pali, komabe, nthawi zonse zotheka kuti zonse sizili monga zikuwonekera. Mwina sitidzadziwa motsimikiza, koma izi tikudziwa: ngati zomwe zapezedwazo zikanachokera kumalo osungiramo zinthu zakale omwe anthu amayembekezeredwa, pakanakhala mikangano yocheperapo. Chifukwa chake, nthanthi zaposachedwa za chisinthiko ndi nthawi yotambasulidwa ya geologic siziyenera kulepheretsa kuvomereza zinthu zopangidwa ndi anthu kapena mafupa opezeka mu stratum pomwe “nzeru” wamba imaletsa.
