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Geology of Southern Oklahoma
Group #6 Ronnie Miller Amy Miller Kim Scott Kristi Birdsong Hannah Benson Amy Benson Reina Womack Tammara Cook Brenda Wright Lee Vertrees
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Sedimentary Rocks of Bryan County
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Quaternary Period Alluvium 20-30 ft deep
Sediment that will eventually form conglomerate rocks 10,000 years –present Qt
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Cretaceous Period
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Dexter Sandstone 85-90 ft thick Kwd Shallow ocean formation
Natural Aquifer Yellow brown, iron containing sedimentary rock
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Bennington Limestone 7-13 feet thick Kb Deep Ocean Formation
Hard limestone w/fossil Blue-gray, very dense, fossilized limestone
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Fossilized Bennington Limestone
7-13 feet thick Kb Deep Ocean Formation Hard limestone w/fossil Blue-gray, very dense, fossilized limestone
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Pawpaw Sandstone 40-45 feet thick Kbp
Youngest of the Bokchito Formation
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Evidence of Sandstone Sandstone is permeable to water. Natural Aquifer
Plant Growth Willow Trees Mimosa Tres Cat tails Horse tail rush
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Soper Limestone 0-2 feet thick Kbs Deep Ocean Deposit
Gray, fossilized limestone
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Caddo Formation 150-160 feet thick Kc
Alternating layers of limestone and shale Cream colored limestone, gray colored shale
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Kiamichi Formation 30-40 feet thick Kk Deep Ocean Formation
Dark-gray to black limestone Fossilized with ammonites
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Geology of Johnston County
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Antlers Sandstone 250-600 feet thick Ka
Poorly cemented, unfossilized, white to yellow sandstone Used by Cardinal Glass in Durant Also used as frac sand by oil companies
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Wapanuka Formation Limestone and Shale interbedded
Shallow Ocean formation Calcium Carbonate from coral reefs Crinoids fossils abundant
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Springer Formation Limestone on the ground
Lichens tend to grow on limestone giving them a darker appearance Found at the edge of the Arbuckle-Simpson Aquifer
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Woodford Shale Dark colored shale Presence of phosphate nodules
Natural gas deposits are found in Woodford shale MDsw Deep Ocean Deposit million years
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Dolomite Thick deposit of Magnesium Carbonate Ocm
million years
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Granodiorite P€gr Medium-grained hornblende-biotite
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Troy Granite P€tr Medium-grained pink granite
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Tishomingo Granite 1.37 billion years P€ti
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Granitic Gneiss 1.39 billion years P€gg
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Trip Through the Arbuckles
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Anticlines Form when convergent forces in the earth fold rock layers upward. Causing the oldest layers at the core with younger layers progressing outward from the core
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Synclines Form when convergent forces in the earth fold rock layers downward. Causing the oldest layers at the core with younger layers progressing outward from the core
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Faults Occur where forces inside earth have caused layers to break and fall at different angles.
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Collins Ranch Conglomerate
IPcr 3000 ft thick est.
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Woodford Shale MDw Blake shale
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Viola Group Limestones that form steep resistant ridges Ov
684 feet thick
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Oil Creek Formation Basal Sandstone Ooc 747 ft thick
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Joins Formation Thin bedded, fossiliferous light gray limestone Oj
294 feet thick
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West Spring Creek Limestone
284 ft thick Ow Mostly gray to tan limestones
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Butterly Dolomite Oldest member of the upper Arbuckle group Ob
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Sylvian Shale Mostly olive green plastic to fissile clay shale Os
At contact zone with Keel Limestone of the Hunton Group
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Kindblade Formation Gray, fine grained limestone Ok 1440 feet thick
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Royer Dolomite Only Cambrian sample Pink to gray massive dolomite Cry
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