LOWER ORA LK—DEVONSHIRE. 125 
where clearly separable from it; but he also perceived that this 
fauna included most of the so-called Warminster fossils, and as he 
then considered the Warminster Greensand to be the equivalent 
of the Chloritic Marl of the Isle of Wight, he correlated the three 
sets of beds with one another. 
The coast-sections were examined by the present writer in 1894, 
and the exposures of the zone of Ammonites Mantelli at Pin hay, 
Whitecliff, Beer Head, and Hooken cliffs were described in some 
detail in 1896.* In this paper it was pointed out that there was 
a strong Chalk-Marl element in the fauna, and also that a very 
large proportion of the species (132 out of 185) occur in the Ceno¬ 
manian of Western France. It should also be mentioned that 
Mr. Meyer revisited the sections with one of the writers, and 
concurred in his conclusions. 
In both these papers certain points were left undiscussed. Mr. 
Meyer’s beds, 10, 11, 12, were simply regarded as- corresponding to 
the “ lower part of the Lower Chalk,” i.e., to the whole or a part 
of the Chalk Marl. Nothing was said as to the possibility of their 
including the true Chloritic Marl or subzone of Stauronema Carteri ; 
nor was the relation of these beds to the Lower Chalk of Chard and 
Dorset dealt with, except that mention was made of the occurrence 
of a similar fauna at the base of this chalk. These two points may 
now be discussed. 
First, with regard to the representation of the Chloritic Marl 
or subzone of Stauronema Carteri. We have seen that it does not 
occur in Dorset, and we have expressed the opinion (p. 107) that 
some of the Chalk Marl is also absent in that county. We might 
therefore expect that there was a similar hiatus in Devon, and so 
far as the Chard and Membur} r districts are concerned there probably 
is ; but it is difficult to believe that the quartziferous beds of the 
Ammonites Mantelli zone passed northward and eastward into 
such pure calcareous chalk as exists at those places. It seernb more 
probable that the arenaceous beds are older than the chalky beds, 
and even in part older than the phosphatie conglomerate which 
there lies at the base of the Chalk. 
There is, then, no a priori reason why some part of Mr. Meyer’s 
Bed 10 should not represent the subzone of Stauronema Carteri. 
This bed contains many sponges, but though careful search has 
been made for Stauronema, not a fragment has yet been found, 
either in that or the overlying beds. TurrHites Morrisi, which is 
characteristic of the Chloritic Marl in the Isle of Wight, has been 
found by Mr. Meyer in Bed 12, but not in the lower beds. The fauna 
contains many species which do not occur in the Chalk Marl, and 
some of these do occur in the Chloritic Marl and in the still older 
Warminster Greensand, but this older aspect of the fauna is to he 
accounted for by the arenaceous character of the deposit and its 
obviously shallow water origin. 
* See “The Delimitation of the Cenomanian.” By A. J. Jnkes-Browne 
and W. Hill. Quart. Journ. Geol. Soe., Vol. lii. p. 99. 
