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1 Quiz 12 Bonus 2 (9:30-9:35 AM)
2 UNIVERSITY OF SOUTH ALABAMA GY 112: Earth History Lectures 32 and 33: Mesozoic Sedimentation Instructor: Dr. Douglas W. Haywick
3 Last Time Mesozoic Tectonics A) The Triassic B) The Jurassic C) The Cretaceous (web notes 31)
4 Mesozoic Tectonics Tectonics in North America during the Mesozoic was dominated by docking events involving terranes. Ultimately, continents grow bigger by scooping up geo-crap in their drift direction (Accretionary tectonics) Sonoman Orogeny
5 Mesozoic Tectonics Into the Triassic, many more terranes (mostly island arcs) began to be scooped up by North America as it drifted WNW Brooke Range Terrane (Alaska) Stikine Terrane (British Columbia) Sonoma Terrane (Nevada)
6 Mesozoic Tectonics In the Jurassic, we start to see terranes with mixed lithologies docking with North America (e.g., Klamath Terrane) Major (felsic) intrusions begin
7 Mesozoic Tectonics In the Cretaceous, more hits and more intrusions. More uplift Wrangellia Terrane docks
8 What s the Point? The Appalachians and Cordilleran Mountains were both formed via compressional tectonic events. Appalachians formed through collisions with other continents Cordilleran Mts. formed via accretionary tectonics
9 Today s Agenda Mesozoic Sedimentation A) Triassic Sedimentation (Breakup of Pangaea) B) Jurassic Sedimentation (Birth of the Atlantic Ocean) C) Cretaceous Sedimentation (Creation of the Coastal Plain Province) D) Mesozoic-Cenozoic climate (Greenhouse-Icehouse Earth Transition) (web notes 32)
10 Mesozoic Paleogeography
11 Mesozoic Sedimentation Triassic Initial opening of Gulf of Mexico
12 Mesozoic Sedimentation Triassic Initial opening of Gulf of Mexico
13 Mesozoic Sedimentation Triassic Initial opening of Gulf of Mexico
14 Mesozoic Sedimentation Triassic
15 Mesozoic Paleogeography
16 Mesozoic Sedimentation Early Jurassic Initial flooding of Gulf of Mexico and Northern Atlantic Ocean
17 Mesozoic Sedimentation Early Jurassic Initial flooding of Gulf of Mexico and Northern Atlantic Ocean
18 Mesozoic Sedimentation Late-Triassic/Early Jurassic
19 Mesozoic Sedimentation Late-Triassic/Early Jurassic
20 Alabama Mesozoic Stratigraphy
21 Alabama Mesozoic Stratigraphy Halite (evaporite basin) Great Salt Lake (evaporite basin)
22 Alabama Mesozoic Stratigraphy Quartz Arenite (beach/desert) Sand dunes in the Gobi Desert
23 Alabama Mesozoic Stratigraphy Fossil. Limestone & Dolostone (shallow marine with stromatolitic reefs) The Great Barrier Reef
24 Mesozoic Sedimentation Mid-Late Jurassic More widespread flooding of Gulf of Mexico and Atlantic Ocean and
25 Mesozoic Sedimentation Late Jurassic major transgression and flooding of the craton begins Sundance Sea
26 Mesozoic Sedimentation Late Jurassic major transgression and flooding of the craton begins Sundance Sea Clastic wedges
27 Mesozoic Sedimentation Sundance Sea Late Jurassic major transgression and flooding of the craton begins Sundance Sea Clastic wedges
28 Mesozoic Paleogeography
29 Mesozoic Sedimentation Cretaceous Southern rifting in the Atlantic Ocean Gulf of Mexico stops opening
30 Mesozoic Sedimentation Cretaceous Southern rifting in the Atlantic Ocean Gulf of Mexico stops opening AL Coastal Plain sedimentation
31 Mesozoic Sedimentation North South Only key formations are labeled (those discussed in GY 112)
32 Mesozoic Sedimentation North South Only key formations are labeled (those discussed in GY 112)
33 Mesozoic Climate High latitudes were warm 50 F / 10 C Dinosaurs near south pole
34 Mesozoic Climate Period of high sea level Associated with rapid sea floor spreading Long period without reversal Long Cretaceous Normal Chron
35 Mesozoic Climate Oceans stagnated Epicontinental black muds when seas spilled over Normally thin oxygen poor zone expanded This will change in the early Cenozoic (Late Eocene)
36 Cenozoic Climate Oxygen isotopes Late Eocene cooling Deep sea foraminifera
37 Cenozoic Climate Temperature inferred from leaf margins
38 Cenozoic Climate Paleocene-Middle Eocene: No circumpolar current Late Eocene-today: Circumpolar current Permitted development of glaciers on Antarctica
39 Cenozoic Climate
40 Today s Homework 1. Time Chart 3 due Thursday April 28 th 2. Study. Lab Final April 26 th 3. Study. Lecture Final May 4 th 4. Online class evaluation bonus opportunity soon Next Time 1. Cenozoic overview/tectonics
41 GY 112: Earth History Lectures 32, 33: Mesozoic Sedimentation Instructor: Dr. Doug Haywick This is a free open access lecture, but not for commercial purposes. For personal use only.
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