Lower chalk—kentish coast. 
37 
Mr. Price informs us that he did not observe any horizon which 
he could take as a line of division in his Bed VI., and that, so far 
as his evidence went, the principal fossils ranged throughout its 
thickness. But as all previous observers had recognised a differ¬ 
ence of colour and texture in the upper 50 feet, and as the French 
writers agree in making this a separate zone, uniting it with the 
marl above as the zone of Belemnites plenus, it was thought 
desirable to re-examine the section. This was done by Mr. 
W. Hill, and the result confirms the descriptions of Messrs. Phillips 
and Whitaker, for though fossils are few in the higher part of 
the Lower Chalk, yet the difference of colour is marked, and the 
change from grey to white agrees with the facts observed at 
many other inland localities, so that it is not a mere local accident 
of colour.* 
Moreover, it was found that the chalk in the lower 19 feet of 
Mr. Price’s Bed VI. was very marly, and contained Ammonites 
vcirians with other Chalk Marl fossils. We think, therefore, that 
this 19 feet should be grouped with the Chalk Marl and that Bed 
VI. is capable of separation into four beds, quite equal in importance 
to any of those below, though some are less fossiliferous. 
The following, then, is our subdivision of the Lower Chalk be¬ 
tween Folkestone and Dover, the beds being numbered from below 
upwards, and Mr. Price’s numbers being given for comparison : — 
Mr. Price’s 
9 
Belemnite marl ------ 
ft, 
6 
Beds. 
VII. 
.■§ r T3 
X CD 
- 8 
Massive white chalk with Holaster trecensis 
!S W J 
1 
f 7 
and Disco idea cylindrica - 
Greyish chalk in thin beds with stony 
53 
► 
VI. 
lumps—large Ammonites - - - 
7 
og 
l 6 
Grey chalk with few fossils - 
60 J 
. 
f 5 
Grey marly chalk, fossiliferous - 
19 
S-I 
4 
1 The cast bed ; many fossils 
? 2 
V. 
a 
X ' 
3 
Soft grey marl with two hard beds at the 
top, Am. [Acanthi] rotomagensis 
20 
IV. & III 
c3 
X 
2 
Soft grey marl with Plocoscyphia 
10 
II. 
■ O 
l 1 
Glauconitic marl with Stauronema 
16 
I. 
193 
STR ATI GRAPHICAL D ET AILS. 
Zone of Ammonite varians. 
(Chloritic Marl and Chalk Marl.) 
Bed 1. —Subzone of Stauronema Carteri .—Resting on the marly 
clay of the Upper Gault is a bed of glauconitic marly sand and sandy 
marl, consisting largely of glauconite grains with some quartz sand 
and a varying amount of marly material. The basal part is of a 
dark green colour, and may be termed an earthy greensand or 
* See Quart. Journ. Geol. Soc., Vol, xlii. p. 225, and subsequent descrip¬ 
tions in this memoir, 
