126 GEOLOGY OF THE BLACK HILLS. 



Feet, 



10. Sandstone, pink and white, shaly 3 



9. Limestone, pink 5 



8. Limestone, light pink 4 



7. Sandstone, coarse, calcareous, pink 4 



6. Limestone, gray 2 



5. Talus 40 



4. Limestone, pink 2 



3. Limestone, argillaceous and silicious 5 



2. Sandstone, white and pink , „ 3 



1. Limestone, gray and pink, in massive bands separated by bands of clay, and 



becoming sandy to the bed of the creek 30 



These beds are generally highly colored pink or red, and the majority 

 of the limestones appear to be more or less magnesian and frequently sili- 

 cious and flinty. Several of the limestone strata are somewhat fossilferous. 

 The fossils are poorly preserved casts and are similar in character to those 

 found in the same series of rocks on Box Elder Creek. 



The Box Elder section is more complete, for the underlying silicious 

 limestone and the purple limestone of the Red Beds both appear in the cliff. 

 It was carefully measured and examined in detail. 



Section of the upper Carboniferous series on Box Elder Creek, in 



descending order: 



Bed Beds. 



Feet. 



45. Purple limestone 25 



44. Eed clay 100 



Nos. 5 and 4 of the Carboniferous. 



43. Variegated sandstone ; 75 



42. White and yellowish sandstone 15 



41. Talus with fragments of 42 10 



40. Sandstone, red, calcareous 5-6 



39. Sandstone with limestone fragments, talus 50 



38. Sandstone, deep red, calcareous - - 5 



37. Concealed 14 



36. Limestone, pink ■ 1 



35. Concealed 10 



34. Limestone, purple 1 



33. Sandstone, pink and white, soft and thin bedded 8 



32. Limestone, pink and gray 6 



31. Concealed 5 



30. Limestone, gray, stained red , 4 



29. Sandstone, red 3 



