1. MSPG 2010
A trip through the geographic time scale in the not so magical school bus. .

2. BRYAN COUNTY AREA ..

3. 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

4. BRYAN COUNTY AREA
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6. BRYAN COUNTY AREA

7. 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.

8. BRYAN COUNTY AREA

9. SOPER LIMESTONE
Soper limestone lies between the Weno and Denton Shale

10. BRYAN COUNTY AREA

11. 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: 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.

12. JOHNSTON COUNTY AREA

13. 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

14. Cardinal Glass Sand Quarry

15. Woodford Shale From the Mississippian-Divonian Period (MDsw)
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

16. Granitic Gneiss
Medium to fine-grained
Pervasive metamorphic textures

17. 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.

18. Grandodiorite
Precambrian
Medium-grained gray : hornblende-biotite

19. Tishomingo Granite About 1.3 billion years old
Used for the ground floors of the state capitol in Oklahoma City

20. West Spring Creek Limestone
Tombstone Topography
Limestone: tan to gray
Chert nodules scattered throughout formation
Ordovician Period (Ow), million years old
Mostly sea during that time
Lower Zone (224ft)
South limb of the West Spring Creek Anticline

21. 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

22. Kindblade Formation/West Spring Creek Formation
Tectonic breccia in the Kindblade
The breccia is found in the Ordovician period

23. 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 million years ago

24. West Spring Creek Formation/Collins Ranch Conglomerate
Fault line for the north boundary of the Graben runs north of the road to the sign

25. 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 million yrs.
Gray, fine grained thick bedded
Quartzose Sandstone marks the base of the West Spring Creek
North limb of the West Spring Creek Anticline

26. Kindblade Formation Ordovician Period, (Ok) 438-505 million years ago
Mostly sea at that time

27. Royer Dolomite Cambrian Period (Cry), only sample
million years old
Mostly sea at that time
Pink to gray in color
Massive Dolomite

28. Stratigraphic Sequence of Rocks Observed this Week.

29. Environment of Deposition
Time Period
Rock Name
Environment of Deposition
Cretaceous
Dexter Sandstone
Shallow ocean
Bennington Limestone
Deep ocean
PawPaw Sandstone
McNutt Limestone
Soper Limestone
Caddo Formation Limestone & Shale
Kiamichi Formation Limestone & Shale
Antlers Sandstone
Pennsylvanian
Collings Ranch Conglomerate
River
Mississippian
Woodford Shale
Ordovician
Keel Limestone
Sylvan Shale
Viola Group Limestone
Joins Group Limestone
West Spring Creek Form. Limestone
Kindblade Form. Limestone
Cool Creek Form. Limestone
McKenzie Hill Form. Limestone
Butterly Dolomite
Cambrian
Royer Dolomite
Precambrian
Granitic Gneiss
Tishomingo Granite
Troy Granite
Granodiorite