A trip through the geographic time scale in the not so magical school bus
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MSPG 2010. A trip through the geographic time scale in the not so magical school bus. BRYAN COUNTY AREA. Dexter Sandstone. Approximately 90 million years old Kwd (Cretaceous System, Gulfian Series, Woodbine Formation, Dexter Member, Dexter Sandstone)

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A trip through the geographic time scale in the not so magical school bus

MSPG 2010

A trip through the geographic time scale in the not so magical school bus.

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A trip through the geographic time scale in the not so magical school bus

BRYAN COUNTY AREA

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Dexter sandstone

Dexter Sandstone

  • Approximately 90 million years old

  • Kwd (Cretaceous System, Gulfian Series, Woodbine Formation, Dexter Member, Dexter Sandstone)

  • Sandstone is formed from sediment cemented together from particles found in shallow oceans

  • Yellowish-brown, fine to medium grained, clay ironstone beds


A trip through the geographic time scale in the not so magical school bus

BRYAN COUNTY AREA

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A trip through the geographic time scale in the not so magical school bus

BRYAN COUNTY AREA


Pawpaw sandstone mcnutt limestones

PawPaw Sandstone – McNutt Limestones

40 to 45 million years

The PawPaw Sandstone and McNutt Limestone are found in the Bokchito Formation of the Cretaceous Period.

PawPaw Sandstone allows water to seep through.

Under the PawPaw layer the McNutt Limestone holds the water. As a result the water backs ups through the sandstone to the surface. This provides a constant flow of water allowing for the growth of cattails on the side of the road.


A trip through the geographic time scale in the not so magical school bus

BRYAN COUNTY AREA


A trip through the geographic time scale in the not so magical school bus

SOPER LIMESTONE

Soper limestone lies between the Weno and Denton Shale


A trip through the geographic time scale in the not so magical school bus

BRYAN COUNTY AREA


Kiamichi formation

Kiamichi Formation

  • Dark gray to black fissile shales interbedded in upper parts with thin beds of yellow-gray, fossilferous limestones forming the “shell beds” composed of abundant textgryphae navia.

  • Thickness of layer: 30-40 feet

  • Oldest rock formation in the Cretaceous Period seen on Day 1. The fact that we found this Kiamichi Formation is a testimony to the amount of erosion that has taken place over the past 65 million years in Bryan County.


A trip through the geographic time scale in the not so magical school bus

JOHNSTON COUNTY AREA


Antlers sandstone

Antlers Sandstone

White to yellow-brown

Ferruginous

Crossbedded

Non fossililerous

Line- to medium-grained sandstone

Poorly cemented

Friable pack sand: Interbeds of gray to

black to purple

Ferruginous clay

Found in the Trinity Group of the

Cretaceous Period

Unique Characteristics – Used by the Cardinal Glass Company


Cardinal glass sand quarry

Cardinal Glass Sand Quarry


Woodford shale

Woodford Shale

  • From the Mississippian-Divonian Period (MDsw)

  • 360-408 million years old

  • Formed from water particles settling and cementing together in deeper ocean areas

  • Varied in color: light & dark gray, yellow, rusty

  • Indicator for oil and natural gas

  • Phosphate nodules present


A trip through the geographic time scale in the not so magical school bus

Granitic Gneiss

  • Medium to fine-grained

  • Pervasive metamorphic textures


Ordovician dolomite

Ordovician Dolomite

This rock was found in the Cool Creek McKenzie Hill Formation.

Approximate age

505 – 438 million years.

Environment of deposition

Deep ocean.

It is non-clastic.

It is composed of mineral magnesium instead of pure calcium carbonate, therefore it does not react to hyrdrochloric acid as dramatically as other limestone.

This picture was taken at the Blue River Hunting and Fishing area.


A trip through the geographic time scale in the not so magical school bus

Grandodiorite

  • Precambrian

  • Medium-grained gray : hornblende-biotite


A trip through the geographic time scale in the not so magical school bus

Tishomingo Granite

About 1.3 billion years old

Used for the ground floors of the state capitol in Oklahoma City


West spring creek limestone

West Spring Creek Limestone

  • Tombstone Topography

  • Limestone: tan to gray

  • Chert nodules scattered throughout formation

  • Ordovician Period (Ow), 438-505 million years old

  • Mostly sea during that time

  • Lower Zone (224ft)

  • South limb of the West Spring Creek Anticline


A trip through the geographic time scale in the not so magical school bus

Butterly Dolomite

  • Oldest member of the upper Arbuckle Group

  • Located at the Ordovician/Cambrian boundary

  • Pink/gray

  • Medium to coarse grained sandy dolomite

  • Contains milky quartz


Kindblade formation west spring creek formation

Kindblade Formation/West Spring Creek Formation

  • Tectonic breccia in the Kindblade

  • The breccia is found in the Ordovician period


Collins ranch conglomerate

Collins Ranch Conglomerate

South on I35 to first turnout, at the entrance-I35-marker 29, north end west side-wet turnout

Graben and syncline, Conglomerate pebbles and cobbles ranging in age from West Spring Creek to Reagan Sandstone, deposited into a graben

The Conglomerate is from the Pennsylvania period 320-286 million years ago


West spring creek formation collins ranch conglomerate

West Spring Creek Formation/Collins Ranch Conglomerate

  • Fault line for the north boundary of the Graben runs north of the road to the sign


West spring creek formation

West Spring Creek Formation

  • Marker 25 ft. below top of Kindblade Limestone, one side of marker Kindblade Limestone [OK], one side is West Spring Creek Limestone [OW]

  • Ordovician 438-505 million yrs.

  • Gray, fine grainedthick bedded

  • Quartzose Sandstone marks the base of the West Spring Creek

North limb of the West Spring Creek Anticline


Kindblade formation

Kindblade Formation

  • Ordovician Period, (Ok)

  • 438-505 million years ago

  • Mostly sea at that time


Royer dolomite

Royer Dolomite

  • Cambrian Period (Cry), only sample

  • 505-545 million years old

  • Mostly sea at that time

  • Pink to gray in color

  • Massive Dolomite


A trip through the geographic time scale in the not so magical school bus

Stratigraphic Sequence of Rocks Observed this Week.


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