600 



MESSES. GAEDNEK, KEEPING, AND MONCKTON ON THE 



the Bracklesham series. 

 follows : — 



"We make the section (fig. 7) to be as 



Upper 

 Barton. 



Middle 

 Barton. 



/'White sand, becoming clayey and yellow towards 



I the base, about 



■{ Dark-blue clay, with one band of ironstone a foot 

 I thick, 6 feet from top, and a similar band 4 feet 



^^ lower down ; numerous fossils * 



^Pale and ferruginous yellow sandy clays, green in the 

 upper part, Lignite, Corals, Bentaliura, Ostrea, Cor- 

 bula, Fleurotoma, common, and of several species, 



pale yellow sand at base t 



Layer of tabular Septaria, with many sharks' teeth, 

 pebbles, fragments of wood, &c., and layer of 



scattered pebbles beneath in green sand 



Grey and brown sandy clay, with numerous casts of 

 fossils of Middle Barton species, the shells being pre- 

 served in the lower 7 feet only 



Drab clay, with band of Septaria at top, and a second 

 one 16 feet lower down. Corhula, sharks' teeth, and 

 lignite t 



/^Dark bluish-green clay, with sands in patches at the 

 top, containing Buccinum canalwulatum, Volvaria 

 acutiuscula, Mitra -parva, &c. The whole capped 



with 9 feet of pale grey loamy sand 



The same with Nicmmulites elegans, var. Trestwichiaiia 



/^ Glauconitic sandy clay, the upper 10 feet with Corhula, 

 I &c., then about 15 feet in which casts of fossils are 



bracklesham. ■{ numerous, and the rest unfossiliferous | 



1 Pebble bed 



\^ White sand. 



(inclusive of 48 feet of Bracklesham). 



Lower 

 Barton. 



ft. m. 

 90 



24 



70 



10 



29 



58 



56 

 1 



47 6 

 6 



386 



The white sands at the top of this section have been qnarried for 

 glass-making, and as the change from the vertical position, in which 

 the Bartons occur, to the nearly horizontal bedding of the Lower 

 Headons takes place within the thickness of these sands, they 

 cannot now be very accurately measured. They were estimated by 

 Prestwich to be 100 feet, and by Bristow at as much as 140 to 200 

 feet, but we doubt if they even reach the former estimate. Though 

 quite unfossiliferous, they represent the Becton-Bunny and Long- 

 Mead-End Beds of the opposite coast. 



The Chama-'he^ should appear beneath them, and one of us has 

 found something very like it, but rarely exposed, at low water, just 



* These agree almost precisely with Bristow's observations, Mem. Geol. 

 Survey I. of W. p. 48. 



t Bristow, I. c, adds a band of small pebbles of white quartz and with 

 sharks' teeth, 2 inches thick, 3 feet below the Septaria, and a third large layer 

 of Septaria 5 feet from the base. Also a band of fossils 13 feet from the base, 

 and a band of hgnite 10 feet from the base. His base is, however, 9 feet above 

 om's, the latter thickness being separated as pale grey, loamy sand, thi n ly 

 laminated. 



X Bristow mentions that a fossihferous bed of indurated marl, 6 inches 

 thick, occurs 30 feet 6 inches from the top ; Hgnite bands at 1 foot 3 inches 

 and 19 feet, and a layer of Septaria 28 feet from the upper part. 



