1846.] PRESTWICH ON THE ISLE OF WIGHT TERTIARIES. 



257 



O t« 



pT.S 



a 



w o 



Description of Strata. 



52. Striped grey clay and whitish 

 sand. 



51. Light grey clay. , 



50. Light yellow sand. 



49. Light brown clay. 



48. White and yellow sand. 



47. Brown laminated clay with irregular 

 patches of lignite. 



46. Light green marl interlaminated with 

 grey and yellow sand. 



45. Soft light yellow earthy limestone 

 with shells — contains a central layer of 

 three inches of marl full of shells. 



44. Light greenish marl with shells. 



43, 42. Earthy limestone with a few 

 shells, and underlaid by six inches of cal- 

 careous sand fuU of shells. 



41. Green marl passing into striped 

 greyish sand and grey clay : very irregular. 

 Shells numerous. One inch of green and 

 black clay underlies it. 



40, 39, 38. Light-coloured sands under- 

 laid by two inches of dark clay full of 

 shells, and then three inches of a brown 

 calcareous band full of shells. An irregular 

 seam of lignite. 



37, 36. Olive-green clay and marl passing 

 into bright green with bands of white sand 

 in the lower part. Few shells. 



35. Green marl passing into grey, with 

 an irregular and thin underlying band of 

 lignite. 



34. Sandy and dirty green clay. 



33, 32. Sand, speckled brown and white, 

 passing into light brownish white sand. 



31. Mottled green, yellow and red clay, 

 passing into bright ochreous sand ; very ir- 

 regular. 



30. White sand (very pure and used for 

 glass-making) passing into yellow clay. 



29. Commencing at the top is a black 

 clay with a very few shells in seams and 

 patches — in descending it becomes browner, 

 and very fossiliferous. At point X (see 

 PI. IX. fig. 1) is a layer of large septaria 

 underlaid by a seam of small flint pebbles, 

 immediately below which is thirty feet of 

 greensand, in which fossils are extremely 

 scarce— this then passes gradually into a 

 brown clay with numerous shells and re- 

 mains of Foraminifera, and then again into 

 green sands with a few very small flint peb- 

 bles and traces of vegetable matter, but with 

 few shells. In these beds we find six or 

 seven lavers of septaria. (Stratum " R " 

 of Webster.) 



, . „ Association of genera and 

 g ^ characteristic species in the 

 chief fossiliferous beds. 



Feet, 

 190 

 10 

 1 

 3 

 2 

 3 



100 



45-42. 

 Limnaea. 

 Planorbis. 

 Melanopsis. 



40-37. 

 Cyrena ? 

 Cytherea incrassata. 



29. 



Ampullaria acuta. 

 A. patula. 



Dentalium costatum. 

 Pleurotoma prisca. 

 P. macilenta. 

 P. exorta. 

 Voluta lima. 

 V. luctator. 

 V. spinosa. 

 Fusus longaevus. 

 F. bulbiformis. 

 F. errans. 

 Conus dormitor. 

 Nummulites laevigatum. 

 N. elegans. 

 Venericardia globosa. 

 Pectunculus scalaris. 

 Siinguinolaria IIollo- 



waysii. 

 Buccinum desertum. 

 Nucula simihs. 

 Turritella conoidea. 

 Crassatella sulcata. 

 Corbula globosa. 

 pisum. 



280 



626 



C. re voluta. 

 Spatangus. 

 Cyicna obovata. 

 Venus ? 



iMurex tricarinatus. 

 Rostt'Uaria rimosa. 

 Ancilhuia canahfcrn. 

 Canocllaria evulsa. 



