How shallow seas appeared and disappeared throughout the Paleozoic Era.
Describes the transgression and regression movement of the seas during the Paleozoic and Mesozoic time periods.
Review how shallow seas appeared and disappeared throughout the Paleozoic Era and their effects on sedimentary deposits.
The Paleozoic rocks of the Grand Canyon show that shallow seas covered the land four times.
Orthoceras ruled the Ordovician seas and its fossils are widespread and abundant today. This cephalopod had a shell for protection, a siphuncle for transportation and a sea full of other life.