Geology of Southern Oklahoma

1. 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

2. Sedimentary Rocks of Bryan County

3. Quaternary Period • Alluvium • 20-30 ft deep • Sediment that will eventually form conglomerate rocks • 10,000 years –present • Qt

4. Cretaceous Period

5. Dexter Sandstone • 85-90 ft thick • Kwd • Shallow ocean formation • Natural Aquifer • Yellow brown, iron containing sedimentary rock

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

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

8. Pawpaw Sandstone • 40-45 feet thick • Kbp • Youngest of the Bokchito Formation

9. Evidence of Sandstone • Sandstone is permeable to water. Natural Aquifer • Plant Growth • Willow Trees • Mimosa Tres • Cat tails • Horse tail rush

10. Soper Limestone • 0-2 feet thick • Kbs • Deep Ocean Deposit • Gray, fossilized limestone

11. Caddo Formation • 150-160 feet thick • Kc • Alternating layers of limestone and shale • Cream colored limestone, gray colored shale

12. Kiamichi Formation • 30-40 feet thick • Kk • Deep Ocean Formation • Dark-gray to black limestone • Fossilized with ammonites

13. Geology of Johnston County

14. 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

15. Wapanuka Formation • Limestone and Shale interbedded • Shallow Ocean formation • Calcium Carbonate from coral reefs • Crinoids fossils abundant

16. Springer 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

17. 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

18. Dolomite • Thick deposit of Magnesium Carbonate • Ocm • 438-500 million years

19. Granodiorite • P€gr • Medium-grained hornblende-biotite

20. Troy Granite • P€tr • Medium-grained pink granite

21. Tishomingo Granite • 1.37 billion years • P€ti

22. Granitic Gneiss • 1.39 billion years • P€gg

23. Trip Through the Arbuckles

24. 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

25. 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

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

27. Collins Ranch Conglomerate • IPcr • 3000 ft thick est.

28. Woodford Shale • MDw • Blake shale

29. Viola Group • Limestones that form steep resistant ridges • Ov • 684 feet thick

30. Oil Creek Formation • Basal Sandstone • Ooc • 747 ft thick

31. Joins Formation • Thin bedded, fossiliferous light gray limestone • Oj • 294 feet thick

32. West Spring Creek Limestone • 284 ft thick • Ow • Mostly gray to tan limestones

33. Butterly Dolomite • Oldest member of the upper Arbuckle group • Ob

34. Sylvian Shale • Mostly olive green plastic to fissile clay shale • Os • At contact zone with Keel Limestone of the Hunton Group

35. Kindblade Formation • Gray, fine grained limestone • Ok • 1440 feet thick

36. Royer Dolomite • Only Cambrian sample • Pink to gray massive dolomite • Cry