Sedimentary Geology

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Sedimentary Geology
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Why learn about Sedimentary Rocks

• Source of building materials
• Source of fossil fuels (oil,coal,etc)
• Fresh water source
• Evidence of past surface conditions
• Fossils

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Sedimentary Rock Clastic - particles deposited,
cemented like sandstone, shale Chemical -
precipitation out of solution like salt,
gypsum, some limestone Organic - accumulation of
parts of plants and animals - swamps (coal),
shells (limestone)
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Sandstone
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Conglomerate
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Breccia
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Coquina (ko-KE-na)
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Chemical Sediments
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Sedimentary Structures
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Graded bedding
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Playa (dry basin salt flat)
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Salt mine
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Bonneville Salt Flats
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Q. Why is St. Louis covered with limestone and
other ocean-formed sedimentary rocks?
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Q. Why is St. Louis covered with limestone and
other ocean-formed sedimentary rocks? A. Many
reasons (need to talk about climate, plate
tectonics, continental development)
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