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
Sedimentary Rocks
of Bryan County
Quaternary Period
• Alluvium
• 20-30 ft deep
• Sediment that will eventually form conglomerate
rocks
• 10,000 years –present
• Qt
Cretaceous Period
Dexter Sandstone
•
•
•
•
•
85-90 ft thick
Kwd
Shallow ocean formation
Natural Aquifer
Yellow brown, iron
containing sedimentary
rock
Bennington Limestone
• 7-13 feet thick
• Kb
• Deep Ocean
Formation
• Hard limestone
w/fossil
• Blue-gray, very
dense, fossilized
limestone
Fossilized Bennington Limestone
•
•
•
•
•
7-13 feet thick
Kb
Deep Ocean Formation
Hard limestone w/fossil
Blue-gray, very dense,
fossilized limestone
Pawpaw Sandstone
• 40-45 feet thick
• Kbp
• Youngest of the
Bokchito Formation
Evidence of Sandstone
• Sandstone is
permeable to water.
Natural Aquifer
• Plant Growth
–
–
–
–
Willow Trees
Mimosa Tres
Cat tails
Horse tail rush
Soper Limestone
•
•
•
•
0-2 feet thick
Kbs
Deep Ocean Deposit
Gray, fossilized
limestone
Caddo Formation
• 150-160 feet thick
• Kc
• Alternating layers of
limestone and shale
• Cream colored
limestone, gray colored
shale
Kiamichi Formation
• 30-40 feet thick
• Kk
• Deep Ocean
Formation
• Dark-gray to black
limestone
• Fossilized with
ammonites
Geology of Johnston County
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
Wapanuka Formation
•
•
•
•
Limestone and Shale interbedded
Shallow Ocean formation
Calcium Carbonate from coral reefs
Crinoids fossils abundant
Springer Formation
• Limestone on the ground
• Lichens tend to grow on limestone giving
them a darker appearance
• Found at the edge of the ArbuckleSimpson Aquifer
Woodford Shale
• Dark colored shale
• Presence of phosphate
nodules
• Natural gas deposits are
found in Woodford shale
• MDsw
• Deep Ocean Deposit
• 360-408 million years
Dolomite
• Thick deposit of
Magnesium
Carbonate
• Ocm
• 438-500 million years
Granodiorite
• P€gr
• Medium-grained
hornblende-biotite
Troy Granite
• P€tr
• Medium-grained
pink granite
Tishomingo Granite
• 1.37 billion years
• P€ti
Granitic 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