Dr. FiTTON on the Strata below the Chalk. 



167 



paces ; with a strike to about 20° east of south, and dip to the west of south : and this remarkable 

 group contains in some places pisolitic grains of reddish oxide of iron, disseminated in yellow 

 sand-rock, like that which is found in tlie strata beneath. 



HI, 5. The beds in the upper part of the cliff behind the Brewery are a continuation of part of 



the trroup upon the shore (III. a.), and, like it, contain great numbers of the singular fossil which 

 has been called Endogenites erosa. They are probably the same with those of III. c. which rise on the 

 shore under the Marina at St. Leonard's, of which an extensive section was exposed in excavating 

 the site of the church ; and both groups are interesting, for their apparent identity with the Tilgate 

 strata, which have furnished to Mr. Mantell an almost inexhaustible store of extraordinary fossil 

 remains. 



Beds of the Group {III. h.) in the Cliff on the North-east of the White Rock. 



Ft. In. 



1 . Earthy brown sand-rock, about 



2. A group, about 10 feet in average thickness, composed as below. 



a. Sand in thin courses, alternating with clay, which includes Cyclades. 

 The sand passes into grit, and in some instances also abounds in 

 Cyclas media in the state of pulverulent carbonate of lime. From the 

 different hue of the sand and clay, the cross fracture is perceptibly 

 striped in very thin layers ; and in the darker beds the surfaces of the 

 clay are often dotted with white specks, the sections of very small cylin- 

 drical cavities, now filled with very fine sand or clay, which seem to 

 have passed through several of the adjacent folia, vertically or obliquely 



fi. Thin courses of subcalcareous grit, alternating with bands of clay. The 1 



erit is in small concretional masses, often not more than half an inch 



. . 1-4 



in thickness, which thin off to an edge. On the surfaces adjoining the i 



clay are very numerous Cyclades j 



■y. Flat, nodular masses of argillaceous iron ore, containing Cypris. In the "i 



fallen debris are fragments, apparently from this place, which contain \s 



Ft. In. 

 2 



also clusters of Paludina elongata in great numbers J 



2. Soft argillaceous sand-rock, alternating with thin layers of darker clay, l 

 and including some portions of iron ore about / 



e. Alternate layers of grey sandy clay, and yellowish ferruginous sand-rock, "i 

 passing into grit, and including the remains of Endogenites erosa. }■] 

 This and the succeeding stratum very much resemble (i.) above .... J 



^. Light greenish grey sand, passing into grit, and alternating with clay, "j 

 as in (h.). This bed contains Paludina fluviorum, and Cyclas media, in 1-2 

 great numbers J 



3. Yellowish sand-rock, with ferruginous stains, passing in some places into grit.. 



4. Slaty clay, alternating with yellowish and brown sand, and including remains 



of leaves and stems, in the state of lignite, generally about -j^th of an 

 inch in thickness. The lignite is divided into rhomboidal portions, 

 separated by thin partitions of clay, which, when the coaly matter is 

 removed by decomposition, have a deceptive resemblance to organic struc- 

 ture. This group passes insensibly into (5.) ? 



14 



3 



