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Quiz 12 (bonus!) (9:30-9:35 AM)
Quiz 12 (bonus!) (9:30-9:35 AM) UNIVERSITY OF SOUTH ALABAMA GY 112: Earth History Mesozoic Geology: Sedimentation Instructor: Dr. Douglas W. Haywick Last Time Mesozoic Tectonics A) The Triassic B) The Jurassic C) The Cretaceous (web notes 31) Paleozoic Tectonics Speaking of which… … when the Antler Orogeny occurred, an island arc stuck onto the side of Laurentia. This clump of “new continent” is called a terrane (specifically the Antler Terrane) Paleozoic Tectonics When terranes hit a continent, they are called docking events. Ultimately, continents grow bigger by scooping up geo-crap in their drift direction (Accretionary tectonics) 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) Mesozoic Tectonics 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 Mesozoic Tectonics In the Cretaceous, more hits and more intrusions. More uplift •Wrangellia Terrane docks 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 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) (web notes 32 and 33) Mesozoic Paleogeography Mesozoic Sedimentation Triassic •Initial opening of Gulf of Mexico Mesozoic Sedimentation Triassic •Initial opening of Gulf of Mexico Mesozoic Sedimentation Triassic •Initial opening of Gulf of Mexico Mesozoic Sedimentation Triassic Mesozoic Paleogeography Mesozoic Sedimentation Early Jurassic •Initial flooding of Gulf of Mexico and Northern Atlantic Ocean Mesozoic Sedimentation Early Jurassic •Initial flooding of Gulf of Mexico and Northern Atlantic Ocean Mesozoic Sedimentation Late-Triassic/Early Jurassic Mesozoic Sedimentation Late-Triassic/Early Jurassic Alabama Mesozoic Stratigraphy Alabama Mesozoic Stratigraphy Halite (evaporite basin) Alabama Mesozoic Stratigraphy Great Salt Lake (evaporite basin) http://www.americansouthwest.net/utah/photographs700/salt.jpg Alabama Mesozoic Stratigraphy Quartz Arenite (beach/desert) Alabama Mesozoic Stratigraphy Sand dunes in the Gobi Desert Alabama Mesozoic Stratigraphy Fossil. Limestone & Dolostone (shallow marine with stromatolitic reefs) Alabama Mesozoic Stratigraphy The Great Barrier Reef http://www.anntorrence.com/blog/at-images/gbr_02.jpg Alabama Mesozoic Stratigraphy Fossil. Limestone & Dolostone (shallow marine with stromatolitic reefs) http://www.netl.doe.gov/technologies/oil-gas/Petroleum/projects/EP/images Mesozoic Sedimentation Mid-Late Jurassic •More widespread flooding of Gulf of Mexico and Atlantic Ocean and… Mesozoic Sedimentation Late Jurassic …major transgression and flooding of the craton begins Mesozoic Sedimentation Late Jurassic …major transgression and flooding of the craton begins •Sundance Sea Mesozoic Sedimentation Late Jurassic …major transgression and flooding of the craton begins •Sundance Sea •Clastic wedges Mesozoic Sedimentation Late Jurassic Sundance Sea …major transgression and flooding of the craton begins •Sundance Sea •Clastic wedges Mesozoic Sedimentation Late Jurassic …major transgression and flooding of the craton begins •Sundance Sea •Clastic wedges •Navajo Sandstone Mesozoic Paleogeography Mesozoic Sedimentation Cretaceous •Southern rifting in the Atlantic Ocean •Gulf of Mexico stops opening Mesozoic Sedimentation Cretaceous •Southern rifting in the Atlantic Ocean •Gulf of Mexico stops opening •AL Coastal Plain sedimentation Mesozoic Sedimentation North South Only key formations are labeled (those discussed in GY 112) Mesozoic Sedimentation North South Only key formations are labeled (those discussed in GY 112) Today’s Homework 1. Start Studying; finals are coming up 2. Do the online class survey (Bonus!) 3. $5.00 worth of school supplies donation (Bonus!) Next Time 1. The Cenozoic GY 112: Earth History Lectures 32, 33: Mesozoic Sedimentation Instructor: Dr. Doug Haywick dhaywick@southalabama.edu This is a free open access lecture, but not for commercial purposes. For personal use only.
