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)
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.
Soper limestone lies between the Weno and Denton Shale
White to yellow-brown
Line- to medium-grained sandstone
Friable pack sand: Interbeds of gray to
black to purple
Found in the Trinity Group of the
Unique Characteristics – Used by the Cardinal Glass Company
This rock was found in the Cool Creek McKenzie Hill Formation.
505 – 438 million years.
Environment of deposition
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.
About 1.3 billion years old
Used for the ground floors of the state capitol in Oklahoma City
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
North limb of the West Spring Creek Anticline