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26 Cards in this Set
- Front
- Back
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Breakup of Pangaea
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During mesozoic it dominates
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Paleogeography
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Mid-cont rift at sutures
Triassic:-Gondwana 1st to separate, then Laurasia -Laursia:Himalaya type mtns w/in continent PC basement remains-Opens Up N. Atlantic Ocean Jurassic:-India north -Gulf of Mex forms, vaporites Cretaceous:-S. Atlantic Ocean forms-Australia separates-India continues N |
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Oceanic Circulation
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Triassic: no E-W circulation, superdry interior
Cretaceous: E-W Circulation, complex and fast, wetter interior, rainfall patterns |
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Triassic Clastics and Sills
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rifts cause erosion of mtns
thick sediments w/ basalt sills E Coast only |
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Palisades Sill
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Basalt sills, vertical fractures from N Atlantic spreading
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Craton
-Precambrian basement |
remains intact w/ additions to the continent
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Mesozoic Additions
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NW N.A. microcontinents OC/OC subduction(Indonesia) forming volcanoes, become CC in N.A.
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Granitic Batholith
-Sierra Nevada Batholith -Yosemite NP |
Convergent boundary, subduction zone, Ig injected into Paleozoic sed rocks.
Largest amount of Gr rocks in the world Adds to West (currently Uplifted) |
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Accretionary Wedges
-San Francisco -Franciscan Complex |
Plaster and glue to W of N.A. continent
Alcatraz is exposed Acc wedge |
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Thrust Faulting
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Low angle reverse faulting
-older sediment shoved on top of younger sediment |
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Interior “Eastern” Deformation
-Shallow Subduction |
OC is melted further under continent to cause deformation further to the interior of the continent
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Triassic Chinle Fm
-Petrified Forest NP |
Tr Sed rock
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Jurassic Navajo SS
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Winddunes on barrier islands
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Jurassic Morrison FM
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Most dino bones in the world are found here. Largest formation of Dino bones. Swampy envoirnment. SH-STS vegetation. LS
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Sundance Sea
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Sea was from Cananda to TX through alot of Jurassic(80my)retreats to form swampy enviornment.
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Jurassic Paluxy River – Glen Rose, TX
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From waxing/waning of Sundance sea, swampy intertidal tropical climate. Lime Mud/Mudstone Jurssic.
Preserved dino prints in mud |
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Cretaceous Interior Seaway
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100's of ft deep, no ice caps, high temps, high sea levels
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Salt Domes
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Halite(evaporite) Gulf of Mexico
responsible for onshore/offshore oil/gas extration/storage, domes bouantly rise through sediment.(teardrops) |
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Mid-Ocean Ridge
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Higher sea level explaination. Increased development raises crust, spreads, cools slower, and pushes oceans up onto continents.
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K Austin Chalk
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Outcrop of LS (coccoliths) opean seaway chalk deposition.
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Oil, Gas, Minerals
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Spindletop, oil pools around salt domes in sediments
Stratigic oil reserves |
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Jurassic Louann Salt
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-Oil/Gas extraction
-Oil/Gas storage -Salt Extraction -Sulfur Extraction |
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Coccolith
-Chunnel -Normandy |
Same as Austin chalk, English Channel drilled trough from UK to France.
Cliffs of Normandy are K Austin chalk |
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Avery Island
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Salt extraction, on top of salt dome, honeyombed out, now chile is grown for tabasco
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Athabascan Tar Sands
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300B in oil reserves(Saudi is 192b) Stuck in tar, expensive to exract.
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Mesozoic Mineral Resources
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Largest amount forund in the Mesozoic
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