LOWER CHALK—KENTISH COAST. 
39 
Marl : I agree then with the recent opinion of Messrs. Jukes 
Browne 0 and Price, who consider the zone of Pecten asper to be 
wanting in the Folkestone cliffs. The zone of Ammonites 
laticlavius (Bed I. with Stauronema Carteri of Mr. Price) there 
rests directly on the grey marl with Ammonites in flatus.” 
Bed 2.— Subzone of Plocoscyphia labrosa.— This bed is about 
10 feet thick, and consists of rather hard and somewhat sandy chalk 
of a light grey colour. It contains large grains of glauconite near 
its base, where it passes down into Bed 1, but only grains of micro¬ 
scopic size in the rest of its mass. It includes three or four bands 
of hard chalk, which are full of the two sponges, Plocoscyphia labrosa 
( = mceandrina) and PL fenestrata, and Dr. Barrois has designated 
the horizon here and elsewhere by the name of the former. 
This bed contains many fossils belonging to a considerable number 
of species (see list on p. 42), among which the following are common: 
Holaster herds var. nodulosus, Ostrea fro ns, Inoceramus striatus, 
Lima globosa , Plicatula inflata and Am. [Acanthoceras\ Mantelli. 
Bones of Ichthyosaurus campylodon and of Acanthopholis hor- 
riclus have been found in this bed, and Mr. Price has observed that 
those of Ichthyosaurus only occur in the hard sponge beds. Mr. 
Price also mentions the occasional occurrence of hard concretionary 
nodules, more or less incrusted with iron pyrites and bearing the 
appearance of having been rolled and water worn, with small Ostrece 
and Plicatulas attached to them. 
Bed 3. (III. and IV. of Price).—This includes the beds numbered 
by Mr. Price as III. and IV. because we do not see any good reason 
for so separating them, as most of the fossils which occur in the 
one occur also in the other. 
The total thickness of this subdivision is from 19 to 20 feet. Am¬ 
monites [Schhvnbachia] various occurs throughout. 
The lower 8 or 8J feet (Mr. Price’s Bed III.) consist of soft grey 
marly chalk, mottled in lighter and darker tints, and containing 
some lines of hard nodules. Am. [Acanthoceras] rotomagensis first 
occurs in this bed, and small fish-teeth are not uncommon belonging 
to Corax falcatus , Notidanus microdon and Oxyrhina Mantelli . 
The next 8 feet consist of light grey marly chalk, in which Radio- 
lit es Mortoni occurs. 
The highest 3 feet consist of three well-marked bands each about 
a foot thick ; the first consists of very hard light grey chalk, pool- in 
organic remains ; the second is a soft dark grey marly chalk with 
many fossils ; the third is a hard bed like the first. In the middle 
bed large specimens of Ammonites [Acanthoceras] rotomagensis , 
Am. [Acanthoceras] Mantelli, and a species like Am. 
[Haploceras] lewesiensis occur. A variety of Pecten elongatus is 
also found in this layer. 
Bed 4 (V. of Price).—This is the Bed A", of Mr. Price, and is only 
a thin bed, being less than 3 feet in thickness, but is of importance 
* Geol. Mag., Dec. ii, Yol. iv. p. 364. 
