A. J. Jukes Browne — On the Upper Greensand, etc. 357 
to class it with the Upper Greensand, but remarks that — “ In the 
Memoir on Sheet 12 this bed was described as Chloritic Marl, and 
was classed with the Chalk. This was done at the Suggestion of 
Prof. Edw. Forbes, because in Dorset and in the Isle of Wight 
Scaphites, etc., were supposed first to appear in a bed which is con- 
sidered to be the same as this.” To this difierence of opinion I shall 
liave occasion to refer again presen tly. 
There is another district in which a bed has often been described 
as occupying a similar position ; this is the outlying area of Cre- 
taceous beds in the counties of Devon and Dorset. Mr. Davidson, in 
his Monograph of the Cretaceous Brachiopods, gives the following suc- 
cession as seen in the neighbourhood of Chard and Chardstock : 1 — 
I. Lower Chalk without flints. 
II. Chalk Marl, with fine siliceous and chloritic grains, and Am. Mantelli, 
Discoidea cylindrica, Hol. subglobosus, etc. 
III. The Scaphites Bed, 3 to 9 inches thick, a compact accumnlation of fossils and 
siliceous grains — Scaphites, Nautilus triangularis, N. Icevigatus, Am. 
varians, etc. 
IY. V. VI. The Upper Greensand in three beds. 
This “Scaphites bed” is evidently the analogue of the Chloritic 
Marl, and the bed below is described as distinctly separated from it. 
In 1870 Mr. Whitaker divided the Upper Greensand of Beer 
Head from glauconitic beds above, which he doubtfully refer red to 
the Chalk Marl, and which he showed in an accompanying section 
as overlapping the lower strata. 2 Mr. De Bance afterwards made a 
further subdivision of the beds in West Dorset, establishing a suc- 
cession of five different zones. 3 
I. Zone of Scaphites cequalis. 
( II. Zone of Pecten asper, 20 feet. 
< III. Zone of Hxogyra conica, 15 feet. 
( IY. Fox-mould, 60 feet. 
V. Cowstones (? 40 feet). 
The first of these he considers to be the Chloritic Marl, and the 
last he refers to the Upper Gault, leaving the three middle zones in 
the Upper Greensand. 
In the same year Mr. C. J. A. Meyer published a paper on the 
relative horizons of the Warminster and Blackdown deposits, 4 in 
which he divides the beds of the Beer Head district into a number 
of zones, and groups these into four larger divisions, viz. the Black- 
down beds, the Upper Greensand, the Warminster beds and the 
Chalk Marl, thus limiting the Upper Greensand still more by sepa- 
rating from it the Warminster beds or Pecten asper zone, reducing it 
indeed to little more than the equivalent of the Ex. conica zone of 
Mr. De ßance. Speaking of the Warminster beds he says, “ They 
are seen to cap the Upper Greensand, and are therefore in reaiity 
Chloritic Marl,” a conclusion which he considers to be borne out by 
the evidence of the fossils. 
As however the fauna of the Warminster beds has subsequently 
been found in the Upper Greensand of the Isle of Wight below the 
1 Pal. Soc. Mem. 1852, p. 114. 
2 Quart. Journ. Geol. S 'C., vol. xxvii. p. 98. 
3 Geol. Mag. Dec. II. Vol. I. p. 196. 
4 Quart. Journ. Geol. Soc. vol. xxx. p. 369. 
