360 F. B. Loomis — Origin of the Wasatch Deposits. 



and forming- mountains surrounding the basin ; namely, the 

 Big Horn Mountains to the east, the Rocky Mountain chain 

 to the west and the Owl Creek Mountains to the south. The 

 mingling of remains of fishes, turtles and crocodiles with those 

 of Eohippus, Hyopsodus and Systemodou would occur when 

 the flooded areas dried off, leaving water animals stranded 

 here and there. 



Approaching the present problem from a stratigraphic point 

 of view, a section of the Owl Creek Mountains near Meeteetse, 

 Wyo., across Buffalo Basin, seventeen miles to the top of Tat- 

 man Mountain, gives the following, reading' from the top of 

 the series downward : 



Feet 



1. Coarse gravel, pebbles all trap and up to a 



foot and more in diameter 30 



2. Coarse sandstone 30 



3. Clayey shales, brown and gray . 730 



4. Sandy clays, red, with bands of cream-colored 



sandstone every 10 feet or thereabouts 150 



5. Sandstone, dirty cream color 15 



6. Clay shales, gray and brown 45 



7. Sandstone, cream colored 5 



8. Clay shales, banded red and gray.. 30 



9. Sandstone, cream colored .. 5 



10. Gray shales, brown 60 



11. Coarse sandstone, pebbles up to 10 inches 15 



12. Sandstone, varying from fine to gravel 185 



13. Clays, variegated, mostly gray and brown 75 



14. Sandstone, cream colored 2 



14a. Clay shales, variegated, blue, brown, and red 75 



15. Sandstone, cream colored 3 



16. Shales, gray and slate color 32 



,17. Shales, dirty cream color.. 6 



18. Shales, slate colored 25 



19. Sandstone 1 



20. Shales, slate colored, with frequent thin bitu- 



minous layers 100 



21. Sandstone, cream colored.. 12 



22. Shales, slate colored 33 



23. Sandstone, cream colored. 20 



24. Shales, slate color and brown 38 



25. Sandstone 2 



26. Shale, dark grayish black . 90 



27. Sandstone... 1 



28. Sandy shale, grayish black 50 



29. Soft sandstone, cream colored.. 141 



30. Hard sandstone 2 



31. Soft sandstone, gray 22 



32. Sandstone, dirty gray and cream colored 360 



Total 2391 



33. Carboniferous limy sandstone. 



