Mushure menguva yekuputika kwemakomo makore 1.1 bhiriyoni apfuura, geological basa reMinnesota rave rakadzikama, risina kuputika kwemakomo kana kugadzirwa kwemakomo, asi nekusavapo kwakadzokororwa kwegungwa, uko kwakasiya matanda akawanda emarara. Munguva pfupi yapfuura, chando chakakora chinenge kiromita imwe chakaparadza nyika uye chakavezwa nzvimbo yayo. Zvasara zveiri dombo re volcanic zvakaumba Canadian Shield kuchamhembe kwakadziva kumabvazuva kweMinnesota. Midzi yemakomo anoputika aya uye chiito chePrecambrian gungwa chakaumba Iron Range yekuchamhembe kweMinnesota.
kuchamhembe kwakadziva kumabvazuva kweMinnesota