,.,.,^1 GEOLOGY — EOCKS EAST OF FEONT RANGE LIGNITIC. 123 



1873, but 25 tons. The coal is used very generally by blacksmiths, who 

 have overcome the diflaculty they formerly experienced in not being able 

 to get up a welding-heat with it. 



A bed 7 feet in thickness, and lying somewhat above the main bed, 

 was formerly mined through a shaft 50 feet deep, while, lying still above, 

 a three-foot bed, capped with fire-clay, was followed for CO or 70 feet down 

 its gentle eastern slope into the hill. Still higher, a bed known as the 

 Dabney bed is said to be 9 feet thick, and, when worked, furnished coal 

 of a superior quality, especially for blacksmiths' use. Several other beds 

 have also been opened to a small extent. 



I append a section of the neighboring beds made by Dr. Haydeu in 

 1867 and 1869 : 



Seciion of the lignitic beds at the Marshall mine, Colorado. — Dr. F. K 



Hayden, 1869. 



48. Drab clay with iron ore along the top of the ridge. 



47. Sandstone. 



46. Drab clay and iron ore. ' 



45. Coal, (No. 11,) no development. 



44. Drab clay. 



43. Sandstone, 15 to 20 feet. 



42. Drab clay and iron ore. 



41. Coal, (Xo. 10,) no development. 



40. Yellowish-drab clay, 4 feet. 



39. Sandstone, 20 feet. 



38. Drab clay full of the finest quality of iron ore, 15 feet. 



37. Thin layer of sandstone. 



36. Coal, (No. 9,) nearly vertical where it has been worked, 12 feet. 



35. Arenaceous clav, 2 feet. 



34. Drab clay, 3 feet. 



33. Sandstone, 5 feet ; then a heavy seam of iron ore ; then 3 feet of 

 drab clay; then 5 feet sandstone. 



32. Coal, (No. 8,) 4 feet. 



31. Drab clay. 



30. Sandstone, 25 to 40 feet. 



29. Drab clay, 6 feet. 



28. Coal, (No. 7,) 6 feet. 



27. Drab clay, 5 feet. 



26. "J . (^ Sandsrcne with a seam of clay, 12 to 18 inches, intercalated, 

 I 1° ! 25 feet. 



25. |>^.<j Drab clay, 4 feet. 



24. I B I Coal, (No. 6,) in two seams, 4 J feet. 



23. 3 i^ I Drab clay, 3 to 4 feet. 



22. Yellowish, fine-grained sandstone in thin, loose layers, with plants, 

 5 to 10 feet. 



21. ) ^ ( Drab clay, excellent iron-ore. ) 



20. V c: ^ Coal, (No. 5,) .7 feet. [ 15 feet. 



19. Vq ( Drab clay. ) 



18. Sandstone, dip 11*^. Thia sandstone has a reddish tinge, and is 

 less massive than 14. 



17. Drab clay. ) 



16. Coal, (No. 4.) > 20 feet, obscure. 



15. Drab clay. > 



14. Sandstone, massive, CO feet. 



13. Drab clay. 



