34 
CORALLINE CRAG. 
was only opened to obtain phosphate, and as it did not prove 
remunerative, it was ploughed over. The following description 
of it is condensed from Prof. Prestwich’s account.* 
Commencing with the highest beds, in the old quarry on the 
top of the hill, we again meet with the rock-bed, seen at Orford 
and Sudboum, but absent at Kamsholt. The section is as 
followsf:— 
/. 
Surface soil - - - - - . - 
Dark ferruginous beds of Bryozoa, mostly in fragments,"] 
some entire, with a few shells in the same state. White 
soft calcareous veins descend through these beds from 
the top - - - - - - - J 
Fine sand and grit, comminuted shells, numerous small'1 
perfect shells, and some Bryozoa - - - - j 
Uniform fine compact sand, with small shells and Bryozoa \ 
in the position of growth - - - - - J 
Feet. 
:> 11 
21 
The Bullock-yard Pit at Sutton is the one from which Wood 
collected so largely, and from which he obtained nearly every 
species of mollusc known from the Coralline Crag. Here the 
Coralline Crag, cut to a vertical cliff, against which the Bed 
Crag abuts, is still well exposed. Its upper part shows sand 
full of comminuted shells (referred by Prof. Prestwich to the 
base of his division/*); the lower part (Prof. Prestwich’s bed e) 
consists of calcareous sand with upright Bryozoa and abundance 
of small perfect shells. A few Lutrarice in the position of life 
were seen, but most of the other shells were single valves ; 
though unworn a large number were angularly broken—perhaps 
by skates or cat-fish. Phosphatic nodules are scattered through¬ 
out, though not abundantly. According to Prof. Prestwich the 
London Clay was found in this pit 20 feet above high tide of the 
river Deben, but the junction is not now visible. 
The third section of the Coralline Crag was an old pit, opened 
to obtain phosphate, towards the south-west end of the Coralline 
Crag outlier. It is now filled up, but Prof. Prestwich describes 
it as follows :—■ 
Feet. 
Surface soil » - ° » - - -1 
d. White marly sands with seams of Gyprina - - - ] 
0 . Ditto with Mya and Bryozoa in lower part, and Gardita, Astarte, 1 17 
Anomia, and Venus common in upper part - - - J 
h. Bed of comminuted shells, with single valves of Gyprina, \ . 
Pecten, Geliepora ccBspitosa, &c. - - - - / ' 
a. Bed of phosphatic nodules, with mammalian and cetacean I 
remains, and foreign boulders - - - - / 
London Clay. 
* The bone-bed ’has been described in the last Chapter; the eroded surface of 
Coralline Crag under the Red Crag will be described in Chapter VI. 
t Quart. Journ. Geol. Soc,, vol. xxvii. p. 119. (1871.) 
