Geology of Southern OklahomaGeology of Southern OklahomaGroup #6

Ronnie Miller

Amy Miller

Kim Scott

Kristi Birdsong

Hannah Benson

Amy Benson

Reina Womack

Tammara Cook

Brenda Wright

Lee Vertrees

Sedimentary Rocks Sedimentary Rocks of Bryan Countyof Bryan County

Quaternary PeriodQuaternary Period

• Alluvium• 20-30 ft deep• Sediment that will eventually form conglomerate

rocks• 10,000 years –present• Qt

Cretaceous PeriodCretaceous Period

Dexter SandstoneDexter Sandstone

• 85-90 ft thick• Kwd• Shallow ocean formation• Natural Aquifer• Yellow brown, iron

containing sedimentary rock

Bennington LimestoneBennington Limestone

• 7-13 feet thick• Kb• Deep Ocean

Formation• Hard limestone

w/fossil• Blue-gray, very

dense, fossilized limestone

Fossilized Bennington LimestoneFossilized Bennington Limestone

• 7-13 feet thick• Kb• Deep Ocean Formation• Hard limestone w/fossil• Blue-gray, very dense,

fossilized limestone

Pawpaw SandstonePawpaw Sandstone

• 40-45 feet thick• Kbp• Youngest of the

Bokchito Formation

Evidence of SandstoneEvidence of Sandstone

• Sandstone is permeable to water. Natural Aquifer

• Plant Growth– Willow Trees– Mimosa Tres– Cat tails– Horse tail rush

Soper LimestoneSoper Limestone

• 0-2 feet thick• Kbs• Deep Ocean Deposit• Gray, fossilized

limestone

Caddo FormationCaddo Formation

• 150-160 feet thick• Kc• Alternating layers of

limestone and shale• Cream colored

limestone, gray colored shale

Kiamichi FormationKiamichi Formation

• 30-40 feet thick• Kk• Deep Ocean

Formation• Dark-gray to black

limestone• Fossilized with

ammonites

Geology of Johnston CountyGeology of Johnston County

Antlers SandstoneAntlers 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

Wapanuka FormationWapanuka Formation

• Limestone and Shale interbedded

• Shallow Ocean formation

• Calcium Carbonate from coral reefs

• Crinoids fossils abundant

Springer FormationSpringer 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

Woodford ShaleWoodford Shale

• Dark colored shale• Presence of phosphate

nodules• Natural gas deposits are

found in Woodford shale• MDsw• Deep Ocean Deposit• 360-408 million years

DolomiteDolomite

• Thick deposit of Magnesium Carbonate

• Ocm• 438-500 million years

GranodioriteGranodiorite

• P€gr• Medium-grained

hornblende-biotite

Troy GraniteTroy Granite

• P€tr

• Medium-grained pink granite

Tishomingo GraniteTishomingo Granite

• 1.37 billion years• P€ti

Granitic GneissGranitic Gneiss

• 1.39 billion years • P€gg

Trip Through the Arbuckles

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

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

Faults

• Occur where forces inside earth have caused layers to break and fall at different angles.

Collins Ranch Conglomerate

• IPcr• 3000 ft thick est.

Woodford Shale

• MDw• Blake shale

Viola Group

• Limestones that form steep resistant ridges

• Ov• 684 feet thick

Oil Creek Formation

• Basal Sandstone• Ooc• 747 ft thick

Joins Formation

• Thin bedded, fossiliferous light gray limestone

• Oj• 294 feet thick

West Spring Creek Limestone

• 284 ft thick• Ow• Mostly gray to tan

limestones

Butterly Dolomite

• Oldest member of the upper Arbuckle group

• Ob

Sylvian Shale

• Mostly olive green plastic to fissile clay shale

• Os• At contact zone with

Keel Limestone of the Hunton Group

Kindblade Formation

• Gray, fine grained limestone

• Ok• 1440 feet thick

Royer Dolomite

• Only Cambrian sample• Pink to gray massive

dolomite• Cry