Chemical kuongorora kweimwe matombo sedimentary sediment epasirese, akaitwa nechikwata chenyika dzepasi rose chakatungamirwa nemuongorori kubva kuCentre for Petrographic uye Geochemical Research, chakaita kuti zvikwanise kuwana dhata rekare kudarika pane mamiriro ekunze nyika.
Mhedzisiro yeiyi ongororo inoratidza kuti anopfuura makore zviuru zvina mazana mana apfuura, iko kuumbwa kwe mamiriro ekunze Yakanga yakafanana zvikuru neiyo yakavapo makore ane bhirioni gare gare, apo hunyanzvi hwekukura kwehutachiona hwakavapo pamusoro penyika pakutanga kwekusiyana kwepasi. upenyu izvo zvatinoziva nhasi.
Mhedzisiro ye kudzidza rakaburitswa munguva pfupi yapfuura mumagazini Pnas, raigona kubatsira vesaenzi kuti vanzwisise zvirinani mavambo nekushanduka kwehupenyu mu pasi. Kusvikira nguva pfupi yadarika, vaongorori vaingova nemhando dzakasiyana dzemakomputa emhando yekutanga maitiro eiyo mamiriro ekunze.
Ichi chidzidzo chitsva chinovakira pabasa kubva ku2008 chakange chakaratidza kuti matombo achitevedza mahombekombe eGungwa re Hudson kuchamhembe kweQuebec, zvakarongwa muchimiro che sediments anopfuura makore zviuru zvina mazana mana nemazana matatu apfuura, ndiko kuti makore mazana mashoma emamiriyoni chete mushure mekuumbwa kwe Pasi.