266 Proceedings of the Koyal Society of Edinburgh. [Sess. 
Insoluble in Acid. 
Rock. 
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3 
H3 
Composition of Coarse Residue. 
O) 
'o 
CO 
Per cent 
m 
’o 
'o 
O 
"w 
pc? 
O) 
.s 
' vx 
<D 
ID 
m 
Vi 
cS 
O 
O 
Minerals. 
Max. Size 
of Grains. 
Average Size 
of Grains. 
Organisms and 
Other Ingredients. 
A8 
A small rect- 
angular boulder 
of firm whitish 
chalk, granular 
to the touch. 
Ice-scratched. 
Fragment of a 
subangular 
boulder of grey 
chalk, not hard, 
mealy to the 
touch. 
59-42 
40-58 
10-96 
29-62 
Quartz, mica. 
-21 
... 
(Sponge spiculesand 
Radiolaria very 
abundant. ) 
AS 
74-51 
25-49 
14-75 
10-74 
Quartz, mica, 
chlorite, tour- 
maline, rutile, 
anatase, garnet, 
sphene. 
-21 
•11 
•The coarse residue 
was chiefly aggre- 
gations of fine 
siliceous matter. 
A few spicules, 
- siliceous casts of 
Foraminfera. Ra- 
diolaria. 
B 13 
Fragment of a 
large subangu- 
lar boulder of 
hard, tough, 
grey chalk. 
Ice-scratched. 
86-67 
16-33 
8-14 
8-19 
Quartz, felspars, 
chlorite, garnet. 
Some minute 
spherules of py- 
rites and a few 
grains of glau- 
conite. 
-33 
•11 
The coarse residue 
chiefly aggrega- 
tions of fine silice- 
ous matter. Radio- 
laria and sponge 
spicules and silice- 
ous casts of Fora- 
minifera. 
B 8 
A small rounded 
pebble, exterior 
white, interior 
grey. Chalk 
hard, splintery. 
82-06 
17-94 
11-53 
Quartz, mica, 
chlorite, felspar. 
-32 
•13 
Residue chiefly 
aggregations of 
siliceous matter. 
Radiolaria, spic- 
ules, and siliceous 
casts of Foramini- 
fera. 
A2 
(No. 1) 
Fragment of a 
boulder of white 
chalk. Parthard 
and splintery, 
part soft, easily 
broken on pres- 
sure. Contained 
three flint 
nodules. 
96-35 
3-63 
2-19 
1-44 
Quartz, felspars, 
mica, chlorite, 
tourmaline. (A 
few grains of 
glauconite. ) 
-39 
•17 
Residue chiefly 
aggregations of 
siliceous matter. 
Spicules, a few 
Radiolaria, and 
siliceous casts of 
Foraminifera. 
A 2 
(No. 2) 
87-15 
12-85 
10-75 
2-10 
Same as above. 
••• 
Same as above, but 
with a larger pro- 
portion of casts of 
Foraminifera. 
B7 
A small boulder, 
rough, rect- 
angular in shape. 
Ice-scratched. 
91-76 
8-24 
5-56 
2-68 
Quartz, felspars, 
muscovite, bio- 
tite, chlorite, 
apatite (in the 
quartz), tourma- 
line, augite. 
-78 
•18 
Abouthalf thecoarse 
residue aggrega- 
tions of siliceous 
matter. Many sili- 
ceous casts of cells 
or spheres. Sponge 
spicules and Radio- 
laria. 
