MIDDLE CHALK—COAST OF DEVON. 
447 
This quarry, therefore, shows about 20 feet belonging to the 
Holaster planus zone and nearly 60 feet of the Terebratulina zone. 
Supplementing the section by the thickness seen in Beer cliff' below 
the niche of marly chalk the total thickness of this zone would be 
93 feet. 
The lower 40 feet of this zone is exposed in the Beer free¬ 
stone quarries, and the section has been given on p. 442. 
From Beer Harbour to Beer Head there is a fine range of cliffs 
from 200 to 300 feet in height, but as the beds are nearly horizontal 
and the cliffs are nearly vertical the Terebratulina zone 
is nowhere accessible. If, however, one lands at the little 
bay known as Pounds Pool and looks up at the cliff, the observer 
can easily trace the base of this zone (see p. 437), and between 
30 and 40 feet above it he will see a band of flintless chalk with a 
shaly layer at the base. This band is evidently a continuation of 
that which occurs about 40 feet up in the zone at Beer. About 
24 feet higher still runs a thin layer of dark grey shaly marl like 
that seen in the quarries north of Beer. These two bands are in 
fact continuous all the way from Beer to Beer Head. 
West of Beer Head in the Hooken landslip, between the path 
which leads up from Little Beach and that which leads down from 
the top of the cliff, a fairly continuous section of this zone can be 
examined. This was measured partly by me and partly by Mr. J. 
Rhodes, and is as follows : — 
feet. 
Rough yellowish nodular clialk with scattered bits of phos¬ 
phate ; base of Holaster planus zone. 
Less nodular chalk with flints in layers and scattered, 
lower part with grey marly streaks, Micraster 
corbovis ----- - 
Thin layer of grey shaly marl - - - 
Massive chalk with layers of flints 2 to 4 feet apart, 
and some scattered flints, Ter. gracilis var. lata - 
4^ 
CD 
. 0 ) 
lO 
O 
S3 
$ 
CD 
Massive greyish-white chalk with few flints, Ter. 
gracilis , var. lata - - 
Grey marly chalk, Ter. gracilis var. lata - 
Chalk without flints, massive, Ter. gracilis var. lata 
Chalk with grey marly streaks and several layers of 
large /flints, Ter. gracilis var. lata 
Chalk with many scattered flints - 
Greyish chalk with a marly layer at base - 
Chalk with flints in layers and scattered. Ter. lata 
Limestone of Rhiynch. Cuvieri zone (see p. 438). 
13 
26 
6 
2 
3 
11 
21 
20 
L 
2 2 
105 
Here, therefore, the Terebratulina zone is still thicker than 
at Beer, and it appeared to me that this increase of thickness 
was chiefly in the lower part of the zone, as if it were complementary 
to the thinning of the underlying zone of Rhynehonella Cuvieri. 
It will be noticed that the upper layer of grey marl occurs at about 
