282 Proceedings of the Royal Society of Edinburgh. [Sess. 
G 10. — Consists chiefly of amorphous, calcareous matter ; the recognis- 
able elements form less than 20 per cent, of the rock. There are no cells 
or spheres, their place being taken by small Textularians and Globigerinm. 
There are a few shell fragments and spicules, but no Radiolarians. 
G 11. — Like the last, chiefly amorphous calcareous material, but there 
are more shell fragments including pieces of Echinoid test. A somewhat 
different character is given by many minute particles, presumably of shell, 
in shape suggesting derivation from a small circular form. Two or three 
large Textularians, besides small ones and small Globigerinse, occur, and one 
or two other forms. 
G 13. — A hard splintery chalk crowded with organisms which form 
60 per cent, of the rock. These consist of Globigerinae, Textularians, with 
Foraminiferal cells, spheres, fragments of shell, few of which are those of 
Inoceramus, but are of diverse structure and outline ; pieces of Echinoid 
tests and spines and many sponge spicules also occur, their silica replaced 
by crystalline calcite. There are no Radiolaria. 
The matrix is indurated with finely granular calcite ; the shapes of all 
the organisms are clearly outlined, but the tests of the Foraminifera are all 
very thin. The specimen recalls the structure of chalk rock in its broad 
features, but there is no glauconite. 
G 6 and G 14 are two specimens of a type of chalk which differs from 
any which I have previously examined. Its character is given by the 
large size and bold outline of the cells and “ spheres,” the latter sometimes 
measuring T3 mm. in diameter in comparison with ’08 mm. of those of the 
south. Fragments presumably derived from these tests, for they have a 
circular outline, are scattered through the matrix (Note Gil). There are 
many Foraminifera, chiefly Textularian and Rotaline forms; Glohigerina 
are rare. The larger calcareous fragments include pieces of Echinoid tests, 
small bits of Bryozoa and of shell, the latter being of ragged irregular 
outline ; none appear to be derived from Inoceramus. 
G 2. — Similar rock, though large spheres are not so numerous, hut it 
contains more shell fragments of ragged outline, thin flaky pieces, and one 
or two prisms of Inoceramus. A large fragment of a Bryozoan also occurs. 
These larger elements of the rock are unequally distributed, some parts of 
the section being crowded with them ; in others the calcareous matrix 
predominates. 
G 15 contains shell fragments of the same type, small pieces of 
Bryozoa, very few large spheres, but many minute Globigerinse and 
Textularians. 
G 16. — Shell fragments of the same type but rather larger are very 
