A. J. Juhes Browne — On the Tipper Greensand^ etc. 361 
of 75 ft. Nos. 8 and 9 he parallels with bis Etage C, and nnmbers 
10, 11, 12 he agrees with Mr. Meyer in referring to the fossiliferous 
portion of the Warnainster beds ; thus giving to the whole zone of 
P. asper a thickness of 21 feet. Nos. 13 and 14, called Chalk Marl 
by Mr. Meyer, he cori-elates with the Chloritic Marl, though ad- 
mitting the possibility of the latter bed being the attenuated repre- 
sentative of bis j Holaster subglobosus zone or Chalk Marl. 
He proceeds to trace these several stages through Devon and 
Dorset, but we must not forget that Mr. De Eance had accurately 
described them in 1874, and had even given the same names to two 
of the groups ; had he indeed ventured on a more extended coiTe- 
lation of the zones, he would perhaps have anticipated Dr. Barrois’ 
division of the Upper Greensand ; referring to the tables before 
given, it is evideiat that zone I. of De Rance = Etage E (Chloritic 
Marl), that zone II. = Etages D and E ( Pecten asper), zone III. = 
Etage B (Ex. conica ), while the Fox-mould and Cowstones repre- 
sent Etage A of the Am. imflatus zone. 
The section on the northern side of Swanage Bay has also been 
recently described by Mr. H. G. Fordham, 1 who divides the Upper 
Greensand into its local component beds ; he informs me that he 
would assimilate the first thi'ee of these, with a total thickness of 26 
feet, to the P. asper zone, and refer the remaining 40 or 50 feet to 
the Am. imflatus zone of Dr. Barrois. 
Regarding the Chloritic Marl he says that its junction with the 
underlying Upper Greensand is irregulär but well marked, and 
further on, “I have used the tei'in Chloritic Marl to signify the lowest 
bed of the Chalk Marl, which is characterized by the presence of 
glauconitic grains, and a Chalk Marl fauna, mixed with many derived 
phosphatic casts of fossils.” Its thickness he gives as 4 feet, and 
correlates it with the Cambridge phosphate bed and No. 13 of Mr. 
Meyer’s section. 
Concluding Bemarbs . — As I conceive we now possess a knowledge 
of the true oi'der and succession of the Greensand beds above the 
Gault, together with a more accurate eonception of their character, 
contents, and extent, it only remains for me to make a few remarks 
on the application of the terms Chloritic Marl and Upper Greensand, 
and to indicate one or two points that seem to require still further 
investigation. 
From the foregoing sectional evidence I think it is clear that no 
break occurs in the series from the base of the Gault upwards tili 
we reach the so-called Chloi'itic Marl, and that here there is a well- 
marked discontinuity, both stratigraphical and palaaontological. 
The line of Separation and slight erosion at its base in the South- 
west becomes more deeided when traced to the north-east, and the 
small indigenous fauna, when the numerous derived fossils are 
separated from it, is found to difier veiy little from that of the 
Cbalk-mail and to be quite distinct from that of the Pecten asper 
zone. In the Wealden area the line of division appeai’s to be less 
clear, there has been less erosion, and the bed contains fewer fossils 
1 Proc. Geol. Assoc. vol. iv. p. 8. 
