82 BLUE CHALK MARL. 



have succeeded in collecting a most interesting series of fossils, many of 

 which are peculiar to this bed, and are engraved in the plates annexed to 

 this volume. 



It may be proper in this place to remark, that some eminent geologists 

 appear to have confounded the blue chalk marl with the Weald clay; but 

 the former invariably occurs above the green sand, and the latter below it. 

 These beds are also remarkably distinguished from each other by their 

 organic remains ; the blue chalk marl abounding in belemnites and am- 

 monites, while the clay (as previously remarked) is destitute of fossils, and 

 its limestone contains shells of the genus vivipara only. 



The following sections have been exposed by the sinking of wells in 

 the vicinity of Lewes, and will serve to illustrate the characters and re- 

 lations of this deposit. 



WELLS SUNK IX THE BLUE CHALK MARL. 



Laughton Place. Blue marl, 60 feet. The marl thrown out in deepen- 

 ing this well, contained Kostellaria ParJcinsoni, aucula pectinat, N. similis, 

 Ammonites splendens, A. lautus Belemnites Listen, &c. ; the last-mentioned 

 fossil occurs in profusion in every locality of this bed ; and at Laughton, 

 is exposed on the surface of the ploughed lands. 



Cottage in Moor Lane, parish of Eingmer. Blue marl, 50 feet. The 

 lower beds were intermixed with a considerable proportion of green sand, 

 and contained similar fossils to the preceding. 



Eingmer Green. The wells vary from SO to 90 feet in the marl, but 

 good water never occurs until the bed is sunk through, and the green sand 

 appears. In almost every part of tliis parish the marl encloses hamites, 

 ammonites, belemnites, innocerami, niicida. Sac, three species oi Crustacea, 

 an elegant species of turbinolia, and crystals of sulphate of lime. 



Norlington Green, in the parish of Eingmer. Blue marl, 50 feet. The 

 marl was not sunk through, and consequently no water appeared. There 

 is no stratum in the south-eastern part of Sussex, that contains such an 

 abundance and variety of organic remains, as the marl in this locality. 

 From the depth of 15 to 50 feet the shells occur in prodigious quan- 



