CHALK. 



89 



horizong identifiable, but by chooBing the least steep parts of the 

 cliff we have found it possible to take an unbroken series of 

 measurements from the base of the Upper Chalk downwards, 

 thus continuing the measurements which have already been given 

 for all the beds down to the base of Lower Greensand. The total 

 thickness of beds measured in this section 'amounted to 1,218 feet, 

 as shown drawn to scale in Plate III. The section in the Chalk 

 is as follows : — 



Upper Chalk <( 



Culver Cliff. 



Chalk with grey flints - 

 Smooth chalk with Holaster 

 Chalk, splitting up into nodular 

 masses along wavy dark lines ; 

 fossils ... 



Marl .... 

 Chalk as above . - - 



Beds, obscured by talus 

 Chalk f Hard grey chalk, with a line of 

 Rock. 1 green-coated nodules at top - 

 Thick-bedded white chalk with 



partings of marl 

 Shaly chalk ... 

 fChalk with yellow-coated no- 

 j dules - - . 



Middle Chalk,J Melbourn J Chalk split up by partings of 

 180 ft. 3 in, ^ Rock. "S greenish marl 



Chalk with yellow-coated no- 

 [_ dules - . . 



Ft. In. 



4 



3 







2 



16 



164 



2 



Lower Chalk, 

 206 ft. 



? Belemni- 

 tella 

 Marl. 



Bluish marl, about 



< 



Chalk 

 Marl. 



1 2 



3 



6 



2 



6 



86 



Massive smooth chalk . 

 "Thin-bedded grey chalk and 

 marl in numerous alternations, 

 passing down . - 50 



Similar beds, but rather bluer 

 <( and more marly ; the chalk 

 bands very hard and lumpy, 

 and containing Ammonites 

 varians and sponges abun- 

 ^ dantly - . - 70 



Chloritic Marl (see p. 81). 



An abstract of this section may be arranged as follows: — 



Abstract of the Section of Middle and Loicer Chalk in Culver 



Cliff\ 



Middle Chalk, J Ti'^f-^^^i"^ f ^^^^ - 



180 ft 3 in I ^®^"Ourn Rock - - . 



l Belemnitella Marl - . . 



Lower Chalk, f Massive chalk ... 



206 ft. t Chalk Marl .... 



386 3 



The thicknesses of these sub-divisions at Punfield compared 

 with those given above, show a westerly attenuation of the Chalk 



