CK-12 Foundation
Ck 12: Earth Science: Paleozoic and Mesozoic Seas
[Free Registration/Login may be required to access all resource tools.] Reveals that during the Paleozoic and Mesozoic, six marine transgressions and regressions caused sea level to rise over the continents, leaving evidence in rocks in...
CK-12 Foundation
Ck 12: Earth Science: Paleozoic and Mesozoic Seas
[Free Registration/Login may be required to access all resource tools.] How shallow seas appeared and disappeared throughout the Paleozoic Era.