LectureCh.14 Mesozoic Earth STUDENTS

LectureCh.14 Mesozoic Earth STUDENTS - Ch. 14: Mesozoic...

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Ch. 14: Mesozoic Earth History Key Words - Breakup of Pangaea - Absaroka and Zuni sequences - Sonoma and Cordilleran  (Nevadan, Sevier, Laramide)  orogenies - Atlantic Ocean - Cretaceous Interior Seaway - Terranes The Mesozoic Era _ Middle Life - Cretaceous_ Period (146-66 m.y.) - Jurassic_ Period (200-146 m.y.) - Triassic_ Period (251-200 m.y.) The Breakup of Pangaea - 1 st : rifting between Laurasia and Gondwana o Triassic Period o By end Triassic: Atlantic separates N-America and Africa - 2 nd : rifting of N-America from S-America o Late Triassic/Early Jurassic - Water movement: o Tethys Sea to Atlantic o Pacific to Gulf of Mexico o Low tropical latitudes, restricted bays o Thick evaporite deposits - 3 rd : Antarctica and Australia (still together) separate from S-America and Africa;  India separates from Gondwana o Late Triassic and Jurassic - 4 th : S-America and Africa separate o Jurassic o Narrow basin: thick evaporite deposits - 5 th : Tethys Sea begins to close o Result of clockwise rotation of Laurasia and N-movement of Africa o Narrow seaway between Europe and Africa (Late Jurassic and  Cretaceous) o Today: Mediterranean Sea - 6 th : Antarctica and Australia separate, India near equator, Greenland  independent landmass, S-America and Africa widely separated o By End Cretaceous - 7 th : Global sea level rise o Cretaceous o Worldwide transgression 1
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o Cause: higher heat flow along oceanic ridges Increased rifting Expansion of oceanic crust - 8 th : final stage in Pangaea’s breakup
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LectureCh.14 Mesozoic Earth STUDENTS - Ch. 14: Mesozoic...

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