IN THE ANGLO-PARIS BASIN 23 



Part of Division 5 and Division 6 were exposed during the excavation of the 

 reservoir for the Mid Kent Water Board some 600 yds ENE. of the centre of the Ford 

 Place Clay pit (TQ 64055920). The lower part of the Gault was also exposed in the 

 now long-abandoned Pascall's pit at Wrotham (TQ 62155780) about 2100 yds SW. 

 of the Ford Place Clay pit and was described very briefly by H. J. W. Brown (1924 ; 

 79, 81). Nothing can be concluded from his account, but it is unlikely that the 

 sequence has changed much from that at Trottiscliffe. 



(iv) SEVENOAKS AREA 



This area has been an important centre for the manufacture of bricks and tiles for 

 over a century. Pits have been opened near Kemsing Station (H. J.W. Brown 1924 ; 

 80), Greatness Lane, Otford (Austin Browne 1949 : Khan 1952 : Casey 1954a : 

 Milbourne 1956, 1962, 1963 : Owen 1958, 1963a, b), St. John's, Sevenoaks (Jukes- 

 Browne 1900 : H. J. W. Brown 1924), Dunton Green (C. W. Wright 1947 : Khan 

 1952 : Casey 1954a : Owen 1958) and Chevening (Lobley 1880). These sections, with 

 the exception of the last, together with borehole evidence has given a very good 

 picture of the Lower Gault in this area. Brown (1924 ; 80) records the occurrence of 

 the nodule bed (Division 6) at the top of the Lower Gault just N. of the railway line 

 at Kemsing Station, but there is no other information available about the succession 

 between Wrotham and Otford, a distance of 6| miles. Today, the only section 

 available is that exposed in the Sevenoaks Brick Works Ltd., pit at Otford. 



(a) Sevenoaks Brick Works Ltd., Greatness 



The sequence in the Lower Gault at the Sevenoaks Brick Works Ltd pit at Great- 

 ness Lane, Otford, is shown in text-fig. 9. It was first described by Khan who dis- 

 cussed the foraminiferal sequence (1952), then in part by Casey (1954a) when 

 describing the distribution of Falciferella. Milbourne has described the succession 

 (1956, 1962) but his reading of it was questioned by the writer (1958, 1963a). The 

 six broad lithological divisions seen at Ford Place reach their maximum development 

 here (text-figs. 3 & 9). 



A combination of evidence provided by several boreholes together with surface 

 mapping shows that the Gault-Lower Greensand Junction beds are over 13 feet 6 

 inches (4-11 m.) thick at Greatness. Division 1 (i) apparently is the transitional bed 

 linking the Junction beds with the Gault. The writer reported (1963a ; 39) that the 

 clays of 1 (ii) to (iv) probably represent the upper part of the benettianus (i.e. lyelli) 

 Subzone, and so the bulk of the Subzone is probably present in 1 (i) and, together with 

 the eodentatus Subzone, in the sediments below. The species of Protanisoceras (P.) 

 in 1 (ii-iv) include P. (P.) barrense (Buvignier) a characteristic lyelli Subzone am- 

 monite. In comparison with Ford Place, it can be seen that clay sedimentation 

 commenced earlier at Greatness. The spathi Subzone is represented by Divisions 

 1 (v-vi), 2, and 3 (i-ii). Division 2 is the ' Upper dentatus-spathi nodule bed ' as at 

 Ford Place, and so, the spathi sediments of Division 1 are slightly thicker at Great- 



