150 
THE CRETACEOUS ROCKS Of BRITAIN. 
tt. in. 
2 0 
1 2 
0 5 
0 9 
2 3 
6 7 
Of these beds, No. 3 is clearly the equivalent of the Cornstone 
bed at Maiden Bradley, but is less disturbed, and there is much 
more sand between the stones. The overlying brownish sand 
corresponds with the similar layer at Maiden Bradley, but there is 
no layer of phosphatie nodules at its base. This Bed 4 passes up 
into 4a, the change being chiefly one of colour, but the latter has 
no counterpart at Maiden Bradley; it is a sharp greenish sand, in 
which casts of Am. [Schloenbachia] varians in a pale yellow 
calcareous material occur plentifully, with many Brachiopods, 
especially Rhynchonella grasiana, Rh. dimidiata, Terebratula 
biplicata, and Ter. arcuata; Catopygus columbarius is also 
common. This bed has hitherto been regarded as belonging to 
the Upper Greensand, but I am now disposed to include it in the 
zone of Ammonites varians , and to take the Cornstone Bed (both 
here and at Maiden Bradley) as the base of this zone. It was 
probably from exposures of Beds 4 and 4a that most of the 
so-called Warminster fossils were obtained, and consequently, if 
the above conclusion be adopted, the greater part of the Warminster 
fauna will have to be transferred to the Cenomanian. A list of 
these fossils has been given in the first volume of this memoir. 
It would appear, therefore, that in this part of Wiltshire there 
are beds below the subzone of Stanronema Carteri which must be 
classed with the Chalk rather than with the Selbornian. For this 
new subzone Catopygus columbarius may be taken as an index, as 
this fossil is very common in these beds, and is rare in the Chloritic 
Marl above them. 
There is no open exposure of these beds near Warminster, but in 
1889 I was fortunate enough to find a large cess-pit being dug for a 
new house north-west of St. Denys’ Church. This was 11 feet 
deep, and showed 7 feet of glauconitic mail, the lower part rather 
hard and sandy, with many phosphates, the upper part more marly 
with fewer phosphates. The base was not reached, so that the total 
thickness may be 8 or 9 feet. 
Its junction with the Greensand is, however, shown a little further 
north in a sand-pit by the side of the road south of Dilton. There 
is here a complete passage down from hard glauconitic marl through 
sandy marl to greensand, in a thickness of about 3 feet; the marly 
beds contain scattered phosphatie nodules, while the sand below 
has none. Stanronema Carteri was found in the hard marl. The 
5. Chloritic Marl , with phosphatie nodules and fossils - 
4a. Greenish-grey glauconitic sand, with many fossils but 
without phosphates - . 
4. Soft yellowish-brown sand, with some lumps of hard 
concreted sand and many fossils. 
3. Greenish sand, with scattered “ cornstones ” - - 
2. Soft greenish-grey sand, with scattered calcareous 
concretions, few fossils ; seen for - 
