356 A. J. Julies Browne — On tlie Upper Greensand, etc. 
cluded in bis little book on the Strata of tke Isle of Wight previously 
cited. In these publications he does not appear to propose the 
application of the term to this bed for the first time, although it is 
probable that its position was now first clearly defined ; he thus 
speaks of it at p. 21 : 1 
“ The Chloritic Marl or principal phosphate of lime bed comes 
next in succession and divides the Chalk Marl from the Upper 
Greensand. It is a grey marl full of green grains of a silicate of 
iron and sand, very fossiliferous. The upper part in places exhibits 
a conglomerate of pebbles and small boulders, and in it the fossils 
are chiefly broken as if rolled on a beach. The lower beds contain 
the fossils whole and appear to have been formed in still water. 
Ammonites varians and splendens, and Scapliites striatus are the 
most characteristic fossils, but it also contains abundantly nodules of 
a coprolitic form, composed of from 15 to 28 per cent. of phosphate 
of lime.” 
The bed is stated to vary in thickness from one to three feet, and 
to occur all round Skanklin and St. Boniface Downs directly under 
the Chalk Marl ; a list of other places where the stratum is observ- 
able is also given. 
Nothing is added to this description in the Geological Survey 
Memoir of 1862, except a fuller and more accurate list of fossils. 
Mr. Best informs me that the term Chloritic Marl appears to have 
been first adopted by the Survey during the year 1856, as it is not 
mentioned in the Index of Colours for that year, but is contained in 
the first edition of the Catalogue of Bock Specimeus published early 
in 1857. It may, however, have been used in the field before this 
date, and Prof. Forbes is by tradition accredited with the recognition 
of the fact that its fauna, tliougk peculiar, links the bed ratker with 
Chalk Marl tkan with the Greensand below ; probably this was be- 
tween the years 1844 and 1S48, as Prof. Forbes comments upon the 
list of fossils originally appended to Capt. Ibbetson’s paper in that 
year. Capt. Ibbetson also refers to Messrs. Austen and Nesbit as 
having mentioned the oecurrence of the Chloritic Marl at Guildford 
and Farnham respectively. These gentlemen in 1848 had indicated 
the exact position occupied by the several phosphatic beds in the 
Cretaceous series of Hampshire and Surrey, 2 and although their 
papers do not contain any actual mention of the marl, it is suffi- 
ciently evident that one of the phosphatic beds lies in the uppermost 
green marl described by Messrs. Paine and Way as varying in thick- 
ness from one to fifteen feet, and that this is muck on the same 
horizon as the bed identified by Capt. Ibbetson. 
This was also the view taken by Messrs. Bristow and Whitaker 
in their Memoir on Sheet 12 (1862), where the Chloritic Marl is 
mentioned as occupying a narrow band at the base of the Chalk 
Marl, overlying the Malm Bock, and varying in thickness from a 
few inches to ten or fifteen feet. Sections of this marl are also de- 
scribed in the later Memoir on the Weald by Mr. Topley, wkoprefers 
1 Notes, etc., on the Strata of the Isle of ^Night, b°u<l 011 > 1849. 
2 Quart. Journ. Geol. Soc. vol. iv. pp. 257 and 262. 
