why learn about sedimentary rocks
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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. Sedimentary Rock: Clastic - particles deposited, cemented – like sandstone, shale - PowerPoint PPT PresentationTRANSCRIPT
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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 (kō-KĒ-na)
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Chemical Sediments
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Sedimentary Structures
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Graded bedding
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Kaibab Limestone - 250 million years old, forms the surface of the Colorado Plateaus.
Toroweap Formation - 255 million years old, mostly limestone.
Coconino Sandstone - 260 million years old, pure quartz sand, petrified sand dunes.
Hermit Shale - 265 million years old, soft, easily eroded shales
Supai Formation - 285 million years old, shale intermixed w/ limestone and sandstone. Fossilized muddy river delta that fed into an ancient sea.
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Unconformity
Redwall Limestone - 335 million years old ocean limestones.
Temple Butte Limestone - 350 million years old, freshwater limestone.
Unconformity
Muav Limestone - 515 million years old, limestone that is separated by beds of sandstone and shale.
Bright Angel Shale - 530 million years old, mudstone shale with thin layers of sandstone and sandy limestone.
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Tapeats Sandstone - 545 million years old; Ripple marks suggest formation in shallow seas.
Great Unconformity – almost 300 m.y. gap!
Chuar Group - 825 to 1,000 million years old, mixture of sandstone, limestone and shale.
Nankoweap Formation - 1,050 million years old, coarse-grained sandstone.
Unkar Group - 1,100 to 1,250 million years old, contains lava flows & sedimentary rx
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Unconformity – Gap from 1.25 to 1.7 b.y.
Vishnu Schist and Zoroaster Granite - 1,700 to 2,000 million years old. The Vishnu schist – used to be sandstone, limestone, and shale
This Vishnu Schist and Zoroaster Granite roots of an ancient mountain range, taller than Rockies.
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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?
A. Many reasons (need to talk about climate, plate tectonics, continental development)
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