Lecture 8 Notes

Lecture 8 Notes - Jurassic Period (~175 million years ago)...

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Unformatted text preview: Jurassic Period (~175 million years ago) The Sundance Sea The area around the Jurassic Sundance Sea could have looked something like this Throughout Earth’s history, sea level has risen and fallen dramatically. As it did, shallow seas repeatedly transgressed and regressed over the continents, creating sedimentary rocks. Review 07.12.a2 Typical Scenario of the land-sea environment Sand-sized sediments (later turns into sandstone) Clay-sized sediments (later turns into shale) Sea creatures create shells out of calcite (in tropical areas only) (later turns into limestone) Review Transgression – when sea level rises, and the seas advance over the continents. TIME 1 TIME 2 TIME 3 Sandstone Shale Limestone Review Regression – when sea level drops, and the seas retreat from the continents. TIME 1 TIME 2 TIME 3 Sandstone Shale Limestone Review 07.12.b5 Sandstone Shale Limestone Limestone Limestone Sandstone Sandstone Shale Shale Shale Shale Transgression (sea level rising) Regression (sea level falling) Transgression (sea level rising) Regression (sea level falling) Transgression (sea level rising) OLDER YOUNGER TIME Review Sedimentary Structures Sediments are deposited in layers – this is called bedding (also called stratification) The individual layers are called beds, bedding planes, or strata. These are all equivalent words. On the larger scale, bedding was originally horizontal, however, in detail, individual beds may be more complicated by sedimentary structures. You don’t have to know anything on this figure Golden, Colorado Beds These beds have been tilted by the formation of the Rockies. These beds have been tilted by the formation of the Rockies....
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This note was uploaded on 03/03/2010 for the course GEOLOGY glg 321 taught by Professor Na during the Spring '10 term at ASU.

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Lecture 8 Notes - Jurassic Period (~175 million years ago)...

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