126 GEOLUCiV OF THE BLACK HILLS. 



Feet. 



10. 8;imlstoiu', pink and wliite, shaly 3 



9. Limestone, i)ink 5 



5. Liiiiestone, lijrlit pink 4 



7. Sandstone, coarse, calcareous, pink 4 



6. Limestone, gray 2 



i5. Talus 40 



4. Limestone, piuk 2 



3. Limestone, argillaceous and silicious 5 



2. Sandstone, wliite and pink , 3 



1. Limestone, gray and pink, in massive bauds 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 Hed Beds both appear in the 0110". 

 It was carefully measured and examined in detail. 



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



descending order: 



Red Beds. 



Feet. 



45. Purple limestone • 25 



44. Eed clay 100 



ITos. 5 and 4 of the Carboniferous. 



43. Variegated sandstone 75 



42. White and yellowish sandstone 15 



41. Talii.s with fragments of 42 10 



40. Sand.stone, red, calcareous 5-6 



39. Sandstone with limestone fragments, talus 50 



38. Sandstone, deep red, calcareous 5 



37. Coucealed 14 



3C. 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. Coucealed 5 



30. Limestone, gray, stained red 4 



20. Sandstone, red 3 



