134 
THE CRETACEOUS ROCKS OF BRITAIN 
In the anticline above mentioned there is at one place a fissure 
breaking the surface of the Upper Greensand and filled contem¬ 
poraneously with Cenomanian material. 
The next good section is found at Pounds Pool, where another low 
anticline once more brings the Cenomanian above the level of high 
tide. Here the two layers or courses become distinct and separate 
beds, and the succession at the north end of the cove is as follows : — 
ft. 
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Base of Turonian.—Hard rough yellowish nodular lime¬ 
stone, with green grains in lower part - 
B. Hard glauconitic quartzose limestone with green 
coated nodules at top and bottom and scattered 
throughout; base irregular, and piped into bed 
below - average thickness 
/ A. Very hard whitish shelly limestone, with less quartz 
and glauconite than bed above ; no phosphates 
except at very top, but scattered patches of glauco¬ 
nitic sand here and there. Many fossils. 
Maximum thickness 
Selbornian.—Hard rough calcareous grit, with few fossils, pass¬ 
ing down into sandstone. 
li-2 
H 
3 
6 
The plane of division between Cenomanian and Selbornian is 
well marked, and for the most part even. From the place where 
the above section was taken both beds thin toward the centre of 
the anticlinal, where they are out of reach, but seem to be each 
about 9 inches thick. Viewed from the bay, it is seen that these 
limestones thicken in each direction from the summit of the 
anticline, but most rapidly to the northward. 
From Pounds Pool southward the two beds of limestone can be fol¬ 
lowed with the eye through the cliffs, though they are only acces¬ 
sible here and there ; their combined thickness varies between 3 and 
5 feet, and just before reaching Beer Head measurements taken 
from a large fallen block gave 20 inches for the upper bed and 3 feet 
for the lower bed, each having the same characters as at Pounds 
Pool. A great change then takes place, the mass of the two lime¬ 
stones, with well-marked lower and upper surfaces, can be seen to 
thicken out rapidly in the cliff which forms the actual headland ; 
and where next accessible at the top of a pile of fallen blocks about 
50 yards west of the headland the section is as follows : — 
Base of Turonian.—Hard yellowish gritty and glaueonitic ft. in. 
limestone.29 
/B. Hard quartziferous and glauconitic limestone, 
with green-coated nodules at the top and two 
layers near the base ; weathers to a pitted or 
honeycombed face. Holaster subglobosus, and 
other fossils.2 6 
A. Hard whitish gritty limestone, with layer of green- 
coated nodules at top ; compact and shelly in 
upper part with Pecten asper , Holaster altus 
Am. [Acanth.] Mantelli , etc. ; lower part 
coarse-grained, with Cemocava ramulosa and 
other Bryozoa - - - - 11 to 12 0 
Selbornian. —Calcareous sandstone of finer grain than the 
coarse grit above it; upper surface wefl marked, few fossils 10 0 
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