277 
1914-15.] Chalk Boulders from Aberdeen, etc. 
and showing the prismatic structure, are scattered promiscuously through- 
out. Sponge spicules are rare, and Radiolaria cannot be seen except in 
B 4. The residue of A 1 consisted chiefly of sand grains, a few spicular 
fragments, and one well-preserved Badiolarian. That of B 4 consisted 
chiefly of mineral grains, a few sponge spicules, but Radiolaria were rare. 
This residue is amongst the few containing grains of glauconite. B 10 has 
not been analysed. 
A 7. — In contrast to the last-mentioned specimens this chalk consists 
chiefly of amorphous calcareous matter with a few small Globigerina 0 , 
Textularise, foraminiferal cells, spheres, and shell fragments scattered 
through it. But both Radiolarians and sponge spicules can be seen. The 
residue contained spicules the silica in the walls of nearly all of which had 
reached the chalcedonic stage. There was one Radiolarian also preserved 
as a chalcedonic cast, the network of siliceous skeleton is obliterated, but 
the chambers can be distinguished. 
B 12. — White amorphous calcareous matter forms a large proportion of 
this chalk ; small Textularians, as well as small Globigerinae, are very 
numerous ; shell fragments small, not abundant ; sponge spicules occur, but 
only one Radiolarian can be seen in the section. 
A 5 and A 6 consist almost entirely of foraminiferal cells, and when 
compared with A 1 and B 10 are a striking contrast. It will be noted that 
these are the purest chalks examined from Belhelvie, the insoluble residue 
being only 1’32 per cent, and 1‘81 per cent, respectively. The residue 
consisted chiefly of sand grains, with a very few fragments of spicules, but 
Radiolarians occur in neither of them. 
The following specimens were dredged by the s.s. Goldseeker from the 
Kinnaird Deep off the northern coast of Aberdeenshire. They are all 
rectangular fragments and do not appear to have been rolled, the largest 
being about 8 J in. x 2 J in. x 1 in. 
C2, C3, C4, C 5.— These are white, firm, splintery chalks, and are 
practically identical with A 5 and A 6 of Belhelvie, the recognisable 
organisms being almost entirely cells and spheres ” more or less thickly 
crowded together. A few of the same kind of thin, flaky shell fragments 
occur as in A 5, and here and there a spicule can be seen, but no Radiolaria. 
These specimens are so honeycombed by boring animals, the holes being 
filled with mud, that no analysis was attempted. 
C 1. — Boring animals have shown a nice discrimination and have not 
attacked this specimen, for it is a siliceous chalk similar to those from 
Belhelvie. It consists of Foraminifera, cells, spheres, and shell fragments. 
