FITTON S SECTION AT ATHERFIELD. 



O'Ak) liii : 



313 



fLucina solidula, Forbes. 

 fMactra (Carteroni ?). 

 fArca Cornueliana?, d'Orb. 

 fNucula antiquata, Sow. 

 fTrigonia alseformis, Parkinson. 



t caudata, Agassiz. 



t rudis?, ParMnson(D(sdal€a}). 



fPinna Robinaldina, d'Orb. 

 t*Cytherea caperata {Venus, Sow.), 

 f Venus parva, Sow. 

 fThetis minor, Sow. 

 fCorbula striatula, Sow. 

 tMytilus lanceolatus, Sow. 

 fGervillia anceps, Desk. 



fGervillia solenoides (Forbesiana?, 



d'Orb.) 

 tLingula truncata, Sow. 

 fAvicula pectinata ? 



fAnomia ? 



fTerebratula multiformis (var. 

 Gibbsiana, Sow.). 



t* sulcata, Parkinson. 



fNatica Cornueliana, d^Orb. 



t Gaultina ? 



tRostellaria Kobinaldina, d'Orb. 

 fDentalium cylindricum ?, Sow. 

 fHolaster complanatus, Ag. 

 Lonchopteris Mantellii, Brong. 



[No very well-defined fossils have been found at Atherfield, above this group.] 



XV. Upper Clays and Sand Rock. 



The two great masses of clay, Nos. 46 and 48, being together not 

 less than 100 feet in thickness, I have thought it expedient to place 

 them with the intermediate sand-rock No. 7, in a group apart ; since, 

 besides the importance of so great a bulk of clay, it is by no means 

 improbable that in other sections the equivalents of these beds may 

 be fossiliferous. 



46. Above No. 45, a stratum of clay, full 40 feet thick, which rises 

 between Black-Gang Chine and Rocken End, crosses the Chine about 

 90 feet above the shore, and passing westward forms a small un- 

 dercliif. The clay is dark grey, in some places almost black, 

 containing, especially near the bottom, pyrites, with portions of 

 lignite ; the structure in some places is slaty. I have sought re- 

 peatedly for fossils in this great stratum, but without success, and 

 they are undoubtedly very rare ; but on the confines of this bed, 

 and the sand next above it, are ferruginous concretions, with evident 

 traces of shells, though the species are not distinguishable. 



47 : — somewhat more than 18 feet thick, consists of uniform white 

 and fawn-coloured siliceous sand. The bottom rises about 580 feet 

 west of Rocken End, and the stratum being continued thence under 

 the sea, has a share in the formation of the ledge, or series of ledges, 

 which produces the formidable " race " near that point. Westward 

 it crosses Black-Gang Chine, and is visible from thence to its out- 

 crop between ClifP End and Walpen High Cliif. Seen from the 

 heights near xltherfield it forms a conspicuous line in the section, 

 contrasting strongly with the clays above and below. 



The sand of 47 is dug near Rocken End for the manufacture of 

 glass. It contains here no fossils ; and though, from its position, 

 clearly of submarine origin, is scarcely distinguishable by external 

 characters from the great freshwater sand-rock of Hastings J. 



48. Is a mass of clay mixed with sand, not less than 60 feet thick, 

 in which I do not know that any fossils have been found. Its rise 

 on the shore east of Rocken End is at present concealed ; but it is 



X No. 47, it will be recollected, is the second of the series of sand-rocks which 

 form a principal portion of the upper strata of this section ; the first being No. 40, 

 at the bottom of the undercliff on the west of Black-Gang Chine. 



