410 R. M. Brydone — Zone of 0. pilula, S. English Chalk. 



415 9 



First flint seam of new series. 

 The figures for the lowest 20 feet are estimates only, the clean surfaces being 

 well out of reach. 



It will be observed that my grand total for the combined zones of 

 0. pilula and A. quadratus is identical with that obtained by 

 Dr. Rowe. So also is it for the flintless chalk, but in this case there 

 is a wide discrepancy between his details and mine, which latter 

 I have therefore given very fully. There appeared to me to be at 

 least five nodule beds, the highest being given by a slip a deceptive 

 appearance of being a continuation of the one just below it, and 

 the bed which I have marked as possibly a nodule bed at the base 

 of the section looked as if it must be either that or a strongly 

 marked spoiige bed; it is out of reach, and the point could not 

 be settled. 



I have not attempted to apportion this chalk between the zones of 

 0. pilula and A. quadratus, as I have not yet been able to identify 

 with certainty even the position of the subzone of abundant 0. pilula, 

 without which the upper boundary of the zone of 0. pilula can hardly 

 be fixed. As it is undoubtedly present in typical aspect in Sussex to 

 the east, in Hants to the north, and, as we have just seen, in Scratchells 

 Bay to the west, it might be confidently expected to occur here also 

 in typical aspect, if it were not that the chalk succeeding the zone of 

 Marsupites here is notoriously abnormal lithologically and that the 

 abnormal lithological conditions may have been accompanied by 

 abnormal palseontological conditions which affected the whole of the 

 zone of 0. pilula. The most I can say at present is (1) that if the 

 upper boundary of the zone here is of the usual nature it can hardly 

 be reached for 300 feet at any rate from the nmcronata zone and has to 

 be sought in the remaining 100 feet ; and ''2) that just by the nodule 

 bed I mark as 2 feet thick I have obtained several Asteroid ossicles, all 

 belonging apparently to a small, gently sloping variety of Crateraster 

 quinqueloha, Goldf., which is abundant in the subzone of abundant 

 0. pilula in Sussex and is the exact antithesis of the high, large, and 

 steep-sided form which culminates in the subzone of E. scutatus, 

 var. depressus. There is reason to anticipate that Mr. Spencer will be 

 able to show that such an occurrence has an important bearing on the 

 question which of the subzones is present at this point. As far as 

 I can recollect this is also the point at which in company with 

 Mr. Griffith many years ago I found the 0. pilula and (much-eroded) 

 Belemnite which are referred to by Mr. Jukes-Browne ( The Cretaceous 

 Hocks of Britain, vol. iii, p. 93) and Dr. Rowe ( Coast Sections, V, p. 247). 



