130 
THE CRETACEOUS ROCKS OF BRITAIN. 
The Cliff Sections. 
A mass of Chalk with the zone of Ammonites Mantelli at its base 
comes in as an isolated tract capping the high ground west of 
TJplyme and Lyme Regis. -The Middle Chalk can be seen here and 
there near the top of Ware cliffs, but there is no exposure of the 
Cenomanian till Pinha}^ is reached. 
It can be seen in the cliff west of the mouth of Pinhay (or Cleve¬ 
lands) Combe, but is here very thin, and only a small space of it 
can be reached. It is visible again at the western end of Pinhay 
cliffs in a great cleft, where part of the cliff has parted and slipped 
forward ; and also at several points along the front of Whitland’s 
cliff. None of these places, however, form convenient points of 
study, and the composition of the rock can be examined with much 
greater facility in the fallen blocks which have descended to the 
beach. 
There are several such blocks on the beach west of Pinhay Bay, 
near the waterfall. These show about 3 feet of hard glauconitic 
and quartziferous limestone, the upper and lower parts of which 
exhibit different characters. The lower bed, which we may call A, 
is a very hard, compact, shelly limestone, coarser and quartzose 
in the lower six inches, where the coral-like Bryozoan Ceriocava 
ramulosa is not uncommon ; this bed varies from 1 to 2 feet in 
thickness, and rests on an irregular surface of the hard calcareous 
sandstone which forms the summit of the Selbornian. The upper 
bed is a hard, rough, quartziferous limestone with green-coated 
lumps of more compact stone, and a few brown phospliatic nodules. 
This bed, which may be called B, contrasts with the other also 
by containing very few fossils, and the change from one kind of 
rock to the other is rapid, though they are closely welded together 
and break as one mass. The upper bed also varies from 1 to 2 feet, 
being thickest where the other is thinnest. 
A little farther west there are some blocks which show a remark¬ 
able change the lower bed (A) has disappeared, and only the upper 
one (B) remains (9 or 10 inches thick) welded on to the top of the 
Greensand and surmounted by another bed (C) consisting of chalk 
with many large grains of quartz and glauconite and with many 
derived phosphatic nodules at the base. This is much less hard 
than A or B, and is about 9 inches thick. 
Mr. C. J. A. Meyer examined these blocks in 1895, and agrees 
with me in regarding A as the condensed equivalent of the beds 
which are numbered 10 and 11 in his description of the Beer Head 
section, B as his No. 12, and C as most probably his No. 13. 
Below Whitland’s cliff, and not far from Humble Point, are some 
large blocks in which both A and B are shown, the two together 
having a thickness of 2 feet, of which only 7 or 8 inches belong 
to B. At the Point are other large masses, one of which shows A 
and B with a marked layer of phosphatic nodules at the top welded 
on to B, but having the chalky material of the overlying bed in 
