IN THE ANGLO-PARIS BASIN 25 



ness. Division 3 at both localities is closely comparable in thickness and character 

 except at its base, where 3 (i) at Ford Place has become finer in character and shelly 

 by Greatness and is represented in 3 (i-ii) . Ammonites that occur in 3 (i) at Great- 

 ness consist almost exclusively of species of Hoplites {H.), the fauna being identical to 

 that of the indigenous element of Division 2 itself which contains rarities such as 

 Oxytropidoceras but no examples of Anahoplites were found by the writer. At Great- 

 ness, 3 (ii) contains a few large Inoceramus concentricus but no ammonites. 



At the base of 3 (iii), Anahoplites intermedins and A. praecox appear in the sequence 

 and this is taken by the author to mark the base of the intermedins Subzone. They 

 range up to the top of Division 3 as at Ford Place. The thin seam of ' solid ' phos- 

 phatised ammonite body chamber fragments containing the coarse form of A . praecox 

 is also present at Greatness (3 iv), and above this Euhopiites pricei and its close 

 relatives are characteristic as at Ford Place. Division 4 is thinner than at Ford 

 Place, and only the basal 2 feet 2 inches (o-66 m.) can be classified with the niobe 

 Subzone in contrast to the 4 feet 2 inches (1-27 m.) at Ford Place. At the level 2 feet 

 2 inches (o-66 m.) above the base of Division 4 at Greatness there is a thin bedding 

 plane (bed 10 of Milbourne 1956 ; 236) which contains species of Mojsisovicsia 

 including M. subdelaruei (Spath). This marks the base of the subdelaruei Subzone 

 which is here 8 feet 7 inches (2-616 m.) thick, and is, therefore, thicker than at Ford 

 Place. M. remota (Spath) has been obtained from 4 (iii) ; and 5 (i) has yielded 

 species of Dimorphoplites which indicate the subdelaruei Subzone rather than the 

 meandrinus Subzone although Mojsisovicsia has not yet been found in it. It is 

 important to note that lithologically the base of Division 5 at Ford Place does not 

 correspond to the base of the same lithological Division at Greatness. The meandrinus 

 Subzone commences with 5 (ii) which has yielded Euhopiites meandrinus Spath, E. 

 aff. aspasia Spath, Dimorphoplites spp. and large partly crushed Anahoplites planus 

 (Mantell) . No ammonites were recovered from 5 (iii) but the nodules of 5 (iv) have 

 yielded fragmentary abraded Dimorphoplites and Euhopiites. At Greatness 5 (ii) to 

 (iv) can be correlated with 5 (i) at Ford Place. Division 5 (v) to (vi) at Greatness 

 also contains a meandrinus Subzone ammonite fauna, but 5 (vii) did not yield ammon- 

 ites to me and probably represents 5 (v) at Ford Place which contains an ammonite 

 fauna which shows some affinity with the nitidus Subzone above. 



The nitidus Subzone without doubt commences at the base of 5 (viii) at Greatness 

 and includes 5 (ix) . Together they have yielded a typical nitidus Subzone fauna and 

 measure 4 inches (0-102 m.) in thickness in comparison with the 1 foot 4 inches 

 (0-406 m.) of 5 (vi) at Ford Place. Division 6, the ' lautus Zone nodule bed ', as the 

 author demonstrated in 1958 contains a fauna including elements of the nitidus and 

 daviesi Subzones as well as of cristatum Subzone age. Here, as at Ford Place, the age 

 of the clay in which the phosphatic debris is embedded is of cristatum Subzone age. 



It is worth revising here the stratigraphical positions of the samples studied by 

 Khan (1952) from the Sevenoaks Brick Works. 

 Sample Si 5 ft 6 ins down from the top of Division 3 ; 



intermedins Subzone as Khan recorded. 



Sample S2 6 ins down from the top of Division 3 ; 



intermedins Subzone as Khan recorded. 



