IBBETSON AND FORBES ON THE LOWER GREEN SAND. 195 



Thickness and Description of Strata, 



[Gault, with Fossils.] 



Thickness 

 No. in feet. 



64. Iron band, fragments of fossils - - - - I 



63. Dark sand - - - - - -2 



62. Iron band --*.*"'_- --1 



61. Dark sand - - - - - - 2 



60. Iron band - - - - - - -1 



59. Dark sand - - - - - - -2 



58. Iron band - - - - - - -1 



57. Iron clay and sand - - - - - -12 



56. At the top, white sand ; at the bottom, black sand and clay - 11 



55. Iron at the top, and sand - - - 3 



54. Iron at the top, and dark yellow sand - - - 4 



53. Yellow sand and clay - - - - - 6 



52. Blue clay ----- - - 2 



51. Yellow and white sand, very quartzose - - - - 15 



50. Above, white sand, tolerably solid at the top, clay and sand in the 



middle, and white sand at the bottom - - - - 19 



49. Black clay (perhaps lignite) with brown sand in thin lamina?, tolera- 

 bly even, but in some parts wavy - - - - 17 



48. Yellow sand and blue clay, thinly laminated in some parts, wavy at 



the bottom, the sand white - - - - 31 



47. A second white sand, tolerably solid - ■» - - 13 



(No. 31. crops out on the shore, a little to the west of Blackgang 

 Chine.) 



46. Blue sand and some clay - - - - - - 32 



45. A line of nodules at the top, and blue sand and some clay below - 33 

 44. Third white sand, with tolerably solid yellow at the bottom. This 



stratum runs up from Rocken End - - - - 22 



43. Three sorts of black clay and sand - - - - 40 



42. Iron, fossiliferous, top of Blackgang- Chine Waterfall - - 1 



(No. 24, (the Terebratula zone) crops out on the shore.) 



41. Sand and clay varying from brown to black - - - 4 



40. Iron, fossiliferous ----- . i 



39. White sand, tolerably solid, yellow on the surface ; near the top there 

 are laminae of pebbles ; the bottom of it is in thin laminae, divided 

 by blue sand and clay - - - - - -11 



38. Iron, fossiliferous -- - - - - ' - 1 



37. White sand - - - - - - -10 



36. Blue clay and sand, the blue very conspicuous - - 1 



35. Iron at the top, with fossils ; dark sand below - - - 26 



(Nos. 22. and 23. nodules crop out on the shore.) 



34. Iron at the top, fossiliferous, and dark sand below - - - 18 



33. Iron, fossiliferous, and grey sand below, much used for making mor- 

 tar. Bottom of Blackgang - - - - - 28 



(No. 21. nodules crop out on the shore.) 



32. Iron, fossiliferous, and white sand below - - - - 9 



31. Thin very wavy laminae of black clay (or lignite) full of pyrites, 



with a layer of spongiform nodules near the bottom - - 25 



( No. 20. nodules crop out on the shore. ) 



30. Iron at the top, fossiliferous, with dark sand - - 2 



o 2 



