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Socials g9 geography

geologic time

name the 4 eras for geologic time? cenozoic, mesozoic, paleozoic and precambrian.
Explain the dates time and the 3 major events of the cenozoic era? 66 million years. ice sheets covered most of N. America continents take on present shape and the completion of the rocky mountains.
Explain the dates time and 3 major events of the mesozoic era? 66-245 million years. start of rocky mountain formation, innuation mountains formed and shallow seas in N. American interior.
Explain the dates time and the 2 major events of the paleozoic era? 245-570 million years. large portions of N. America covered by shallow seas and appalachians mountains formed.
Explain the dates time and the major event of the precambrian era? 570-4600 million years.precambrian shields formed(african shield and laurentian shield)
Created by: montykfb