1505 - 1906 .. 
321 
The work was commenced on the 12th of August, 1892 
when Miss Mary K. Andrews, Mr. Stewart, and the writer visited 
a fine section of boulder clay 25 feet in depth, exposed (in 
making subway) at Greenland Railway Station. A short 
description of the work may be of interest, as all sub- 
sequent examinations were similarly conducted, sometimes by 
solitary workers, sometimes by the whole geological section, 
but usually by two or three members, amongst whom I must 
.gratefully single out Miss Andrews and Mr. Robert Bell, whose 
unwearying toil made this summary a possibility. 
Boulder clay usually contains innumerable stones of all 
sizes embedded irregularly throughout its mass. Of these 100 
or more stones were selected at random, broken and counted to 
give the percentage of erratics, an erratic being defined as “any 
stone found m a glacial deposit that is not resting on its parent 
rock, no matter how short 1 distance it may have travelled ” 
lhe subjacent rock at Greenisland being Trias, every stone 
not of Tnassic origin was an erratic, and it was surprising and 
interesting to note what a varied assortment occurred, varying 
in size from chalk boulders, five feet long, down to tiny pebbles 
of far-travelled rocks from Scotland, Ailsa Craig, North Antrim 
Derry, and Tyrone, and large, beautifully-scored, and polished 
blocks of Silurian slate, hailing from either Scotland or the 
County Down. Shells were looked for, and bags of the clay col- 
Jected to be submitted to Mr. Wright for microscopical examina- 
tion. This is the most troublesome and tedious process con- 
nected with our researches, involving hours of monotonous 
labour on Mr. Wright’s part, with only occasional assistance 
from Miss Smythe, as sometimes several pounds of stiff clay 
\.h^u washed, dried, and floated, yield one tiny foraminifer too 
small to be visible to the naked eye ! 
Fossils found in the clays were carefully collected, and 
photographs of the section taken by Miss Andrews for future 
reference. Specimens of well-known rocks were listed in the 
field, other fragments being brought to the Museum, to be num- 
bered, mounted, labelled, and submitted to Mr. Stewart Mr J 
St. J. Phillips, A.R.I.B.A., or Mr. Seymour to ascertain theh 
