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CHAPTER 9

The Late Paleozoic

QuestionAnswer
What time period do we cover in chapter 9? The Late Paleozoic
Can you Name the 5 Major Events 1. Pangea Forms (end of Permian) 2. Lots of glaciation (transgression/regressions) 3. Mountain Buildings (orogenies) 4. Coal Formation! 5. Lots of Evaporites (salt and Gypsum)
What was the first sequence we covered here? Kaskaskian
When did the Kaskaskia Sequence take place? Middle Devonian- Middle Mississippian (happened FAST)
Middle Devonian... Kaskaskian transgression begins, clean, well sorted
What was the source are for sands during the Kaskaskian Sequence? - Middle Devonian - highlands of Appalachian mobile belts formed during Taconic Orogeny
The Usual Carbonates were deposited on top of the sands EXCEPT... Black Shale
Late Devonian- Early Mississippian... - Kaskaskia Sequence (still in session) - wide scale sedimentation, thinly bedded black shales
Thinly black shales are known as? - Chattanooga Shale
What is the strangest thing about this particular shale? - They're shallow water deposits!
Features essential for black shales formation: 1. undisturbed anaerobic (absence of free oxygen) sea bottom 2. Reduced supply of coarser clastic sediments (eroding from land) 3. High organic productivity in the overlying oxygenated waters (leads to shower of organic material that decomposes on seafl
Cool thing about this shale: Rich in Uranium
Not so cool about this shale? - Uranium produces RADON GAS (dangerous)
Middle Mississippian: -Highstand for Kaskaskian Sea - Carbonate deposition dominant (limestone, rich with fossils)
Late Mississippian: - Regression (lots of clastics, deposited on top of carbonates) - craton wide uncomformity resulted from exposure of Kaskaskian sedimentation
What is the second sequence we covered: Absaroka
When did Absaroka take place: -Latest Mississippian-Early Jurassic This extent of sequence (huge chunk of time)
Created by: alejandraB!
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