fitton's section at atherfield. 309 



same appearance precisely occurs in the lower greensand at Tilburstow 

 Hill in Surrey I and at the top of the quarries near Maidstone, Kent §. 

 The greensand in all these cases appears to have included stem-like 

 bodies, the place of which is now occupied by a fine sand of quartz, the 

 contrast of its hue becoming indistinct in dry specimens, but conspi- 

 cuous when moistened. . - < > 



■yr ^bddoBidb lo 

 Fossils of the Cliff-End Gryphcea Group. — Nos. 36 and^T,- 



36. Coniferous wood. t*Fucoides? 



fMytilus sequalis {Modiola, Sow.). Fragments of LonchopterisMantellii. 

 Thetis minor, Sow. 



Ger\dllia Forbesiana, d'Orb. 37. Thetis minor, Sow. 



fPecten interstriatus, Leym. Rostellaria Robinaldina, d'Ori. 



Gryphaea sinuata, Sow, fBrissus "i 



(Several remarkable varieties.) Lonchopteris Mantellii, Brong. 



fTerebratula sella, Sow. t*Inoceramus gryphseoides ? 



XI. Cliff-End Sand with Concretions. — Nos. 38 and ^9. 



38. Nearly uniform sand about 14 feet thick ; this includes a thin 

 bed of retentive fossiliferous clay about two feet from the bottom, con- 

 taining Trigonia Dcedalea^ &c. ; near the top are concretions with Pinna 

 and other species. 



39. Dark bluish clay and greensand, thickness 13 feet to 14 feet, 

 including pyrites, and alternating with layers in which oblique rifts 

 (" false stratification "') are conspicuous. It contains many cylindrical 

 stem-like concretions about an inch in diameter, which are frequent 

 also in other beds hereabouts, and which, especially when branched, 

 as they frequently are, might be ascribed to organization ; but they 

 are generally found to contain pyrites still unchanged and to include 

 particles of sand. 



Fossils of Nos. 38 and 39. 



38. Panopaea plicata, Sow. Lonchopteris Man tellii,^^.5ro?iy». 

 Pinna Robinaldina, d'Orb. 



Trigonia rudis || . 39. No fossils have been obtained from 



t Ammonites Martini, d'Orb. this bed. 



XII. Foliated Clay and Sand. — No. 40. 



40, — ^which is about 22 feet thick, consists principally of a compact 

 very dark blue clay, approaching to shale, in continuous flakes, seldom 

 more than an inch in thickness, alternating with greenish translucent 

 siliceous sand, and containing nodules of pyrites^. The bed includes 

 also large irregular masses (3 or 4 feet — sometimes even as much as 

 13 or 15 feet in length and 1 or 2 in thickness) of a coarse sand-rock 



t See Geol. Trans. 2nd Series, vol. iv. p. 139. 



§ Mr. Sowerby informs me that the spiculae of sponges have been found by 

 Mr. Bensted in the lighter spots here described, near Maidstone. 



II There is some difficulty respecting this species; it appears to be the same as that 

 figured by D'Orbigny as T. rudis, and very distinct from T. Dcsdalea of the same au- 

 thor, the latter still differing slightly from the true T. Dcedalea of Parkinson. — M. 



^ I sought carefully here for lignite, v\^hich has been mentioned as occurring in 

 this bed, but without success. 



