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12 Cards in this Set
- Front
- Back
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How is the cration defined in the early phanerozoic? |
3-4 fold thickening of strata of many successive systems around the margins of the continent Non orogonic Broad gentle warpings in respose to equilibrium with deeper lithospheric processes |
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What formations occur on the craton due to structural changes of the craton? |
Arches raised areas Basins depressed areas |
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What is the transcontinental arch? |
Extends fron az to lake superior Sides have uncnformity bw cambrian and pre cambrian basement rocks |
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What is the sauk transgression? |
3/4 of n am lowlands flooded Highest sea levels have ever been N america was at the equator and rotated 90 degrees Quartz sandstone is the dominant sediment on the craton |
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What is a mature sedimentary rock? Which one was the dominant sediment in during the cambrian? What doee that tell us about the landscape and how tectonics were working during this time? |
A mature sedimentary rock is well sorted and well rounded. The dominant sediment was quaryz sanstone that had been blown all across the cratonn by WIND, idicating low lands and little tectonic activity |
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Why did carbonites arrise? |
All sand deposited |
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What is an oolite? |
Limestone that b3haves like sand Clastic limestone |
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Why are oolites important? |
They shoe us intensr agitation. Huge storms |
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How deep was the sea during the sauk transgression? |
200 m deep |
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Why are stromatiles a good indecator of sea levels du4ing thr ordivician? What brings the demise of them? |
Stromatiles are present in shallow seas thus giving a ref point to sea level. Snails eat em as they evolved in the cambrian |
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How do we know the craton sea was shallow? |
Oolites, stromatiles, and flat pebble conglomerates |
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What are some modern analogs for the sauk sea? |
The florida peninsula Yukatan peninsula Bahamas All have abundent oolites, |
