THE CHLORITIC SERIES. 
299 
Scaphites cequalis. Chloritic marl 
and sand, Dorsetshire. 
Turrilites costatus, Lam. Lower chalk and chalk marl. 
a. Section, showing the foliated border of the su¬ 
tures of the chambers. 
the entire Upper Cre- Fig. 265. Fig 266 . 
taceous series. The 
higher portion of the 
Chloritic series in 
some districts has 
been called chloritic 
marl, from its consist¬ 
ing of a chalky marl 
with chloritic grains. 
In parts of Surrey, 
where calcareous mat¬ 
ter is largely inter¬ 
mixed with sand, it 
forms a stone called 
malm-rock or fire¬ 
stone. In the cliffs 
of the southern coast 
of the Isle of Wight 
it contains bands of 
calcareous limestone with nodules of chert. 
Coprolite Bed ,—The so-called coprolite bed, found near 
Farnharn, in Surrey, and near Cambridge, contains nodules 
of phosphate of lime in such abundance as to be largely 
worked for the manufacture of artificial manure. It belongs 
to the upper part of the Chloritic series, and is doubtless 
chiefly of animal origin, and may perhaps be partly copro- 
litic, derived from the excrement of fish and reptiles. The 
late Mr. Barrett discovered in it, near Cambridge, in 1858, 
the remains of a bird, which was rather larger than the com¬ 
mon pigeon, and probably of the order Natatores, and which, 
like most of the Gull tribe, had well-developed wings. Por¬ 
tions of the metacarpus, metatarsus, tibia, and femur have 
been detected, and the determinations of Mr. Barrett have 
been confirmed by Professor Owen. 
This phosphatic bed in the suburbs of Cambridge must 
have been formed partly by the denudation of pre-existing 
rocks, mostly of Cretaceous age. The fossil shells and bones 
of animals washed out of these denuded strata, now forming 
a layer only a few feet thick, have yielded a rich harvest to 
the collector. A large Rudist of the genus Radiolite, no less 
than two feet in height, may be seen in the Cambridge Mu¬ 
seum, obtained from this bed. The number of reptilian re¬ 
mains, all apparently of Cretaceous age, is truly surprising; 
more than ten species of Pterodactyl, five or six of Ichthy¬ 
osaurus, one of Pliosaurus, one of Dinosaurus, eight of Che- 
loniang, besides other forms, having been recognized. 
