ET.TOHN.] SECTION THROUGH STATION XXI. 373 



13. Bed and chocolate-colored, partially indurated shales, in slope 1G0 

 yards across. 



14. Rusty-stained sandstone, 5 feet exposed. 



15. Dc&m-covered slope, 50 yards. 



16. Thin-bedded gray sandstone, 5 feet ; dip 45°, X. 45° E. 



17. Chocolate-colored shales, 50 yards. 



18. Brown-stained laminated sandstone, 5 feet exposed. 



19. De'&m-covered slope, 100 yards. 



20. Gray sandstone, obscure ledge. 



21. De&m-covered slope, 20. yartls. 



22. Gray sandstone, obscure exposure. 



23. Steep slope, with red shales, 110 yards. 



24. Hard, thin-bedded, laminated, rusty-gray sandstone, 5 feet ex- 

 posed, but evidently much thicker ; dip 50°, S. 35° W. Contains ob- 

 scure vegetable impressions with a narrow salix-like leaf. 



25. Unexposed space, 35 yards. 



2Q. Hard, brittle, laminated, rusty-gray sandstone, 10 feet exposed in 

 ledge forming crest of Station XXI ridge ; dip 55°, S. 35° W. 



27. Slope, no exposure, 50 yards. 



28. Brownish gray sandstone. 



29. Bed shales, 50 to 75 yards. 



30. Gray sandstone, 10 feet exposed, dip southward. 



31. Bed shales, 50 to 75 yards. 



32. Hard, thin-bedded, bluish-gray, brown-stained sandstone, heaA^y 

 led<?e 50 to 60 feet across the exposure ; dip southwestward. 



33. Bed shales, 30 yards. 



34. Gray sandstone, like 32, 10 feet exposed ; dip 45°, S. 45° W. 



35. Bed shales, 100 yards or more. 



36. Bluish drab, fragmentary limestone, obscure exposure. 



37. Light drab indurated argillo-calcareous deposits, exposed at inter- 

 vals, 100 to 200 yards. 



38. Drab limestone and indurated light-drab calcareous shales, obscure 

 exposure. 



39. De&m-covered slope, with small irregular dark carbonaceous nod- 

 ules in upper part, 50 to 100 yards. 



40. Drab, fragmentary limestone, 5 feet exposed. 



41. Bed shales, 50 yards. 



42. Drab, fragmentary limestone, 20 feet exposed ; dip 55°, S. 40° W. 



43. Bed shales, 100 to 150 yards. 



44. Gray and brown conglomeritic, spar-seamed sandstone, sometimes 

 coarse-grained, crumbling, flagging, 10 feet exposed; dip 50°, S. 50° W. 



45. Bed shales, 75 yards. 



46.- Drab, minutely brecciated, spar-seamed limestone with commi- 

 nuted fossils, obscure exposure, dips southwestward. 



47. De'&m-covered space, 20 yards. 



48. Drab, fragmentarv, spar-seamed limestone, 12 feet exposed. Dip 

 50^, S. 45° W. 



49. Limestone, like bed 48, heavy ledge exposed at intervals over a 

 space 75 yards across. 



50. Bed shales, appearing in slope 200 to 300 yards across. 



51. Gray and brown friable sandstone flagging, 20 feet exposed; dip 

 25o to 35S X. 45o B. 



52. Bed shales, exposed in sag, 200 yards or more across. 



53. Drab, close-textured, fragmentary limestone, much broken up by 

 cleavage and joint structure ; apparent dip X. 45° E., at an angle 

 of 35°. This rock occurs as a heavy ledge in the crest of a high ridge 



