Ndezvipi zvezvinhu zvinotevera izvo nyanzvi dzezvokuchera pasi dzisingaongorori: matombo, England, kana kuti makomo? Tichifunga nezvemubvunzo wapfuura, nyora mashoko akapoteredza mhinduro yacho. Inogona kuva mitsara 1 - 20. Mashoko akapoteredza:
Mepu yokutanga yeGeological yeU.S. yakabudiswa muna 1809 naWilliam Maclure. Muna 1807, Maclure akatanga basa raakazvisarudzira rokuongorora nzvimbo dzeUnited States. Akapfuura nokunyora mepu dzinenge dzenyika dzose dzaiva muUnited States, uye akapfuura nokuyambuka Allegheny Mountains kanenge ka50. Migumisiro yebasa rake risina kubatsirwa yakatumirwa kuAmerican Philosophical Society mubhuku rinonzi Observations on the Geology of the United States rinotsanangura Geological Map, uye rakabudiswa muSociety's Transactions, pamwe chete nemepu yekutanga yenyika. Izvi zvakatangira kare mepu yaWilliam Smith yeEngland nemakore matanhatu, kunyange zvazvo yakavakwa pachishandiswa mapoka akasiyana-siyana ematombo.