axe rie (Group IL). 
e whole with that of the strata traversed, and t 
Geology and Mineralogy. 
63 
The strike of the reversed ruin ranges 
r hade is 
ere at a higher angle than the dip of the igo the differ- 
ray 
in 
~ 
fort mewn 
Dtacram-Secrion or Durness-ERtpoie REGION, 
2. Sandstones and Conglomerates—‘ CAMBRIAN.” 
AROH ZAN 
GNEIss. 
1. Gneiss, Granite, Pegmatite, &c. ; 
LowzER 
SILURIAN 
SERIES. 
“Thrust-planes”* Dotted lines = continuation of normal faults 
en, 
a2 
| ibaa aie 4c 
Bi oo ee 
Bo Nee 
o .. 2 
3 e fo 
aS 9 a] 
bp = 
| Portatithetentos 12" 
Ss Ses ee 
Be Sen 
# tee t 28 
@. = 
ed Se tae 
ee 
ai:tgal 
Siige:s 
4 og Be ome 
eeetss 3 
mo S 
SSS538 3 
gS ECR" & 
oh 
Faso23a 
BSsSeas 
Ankayeo & 
ee 
rows 1 
edi = 
a2 * 
oe 
Las 
AS <q 
las NE 
ere i) 
Bits a 
a a & 
Ea a, 
Bors I 
5 Deeds 
mek s os 
Rat's 
asec Ce 
Bees § 
aS a 
Sans 
So°R 2 
20 Fq o 
S2a3 a 
~~ 
She eI 
Saad a 
yea ngs t 
ad < 
ence to 
about 
general inclination of the st 
being toward the southeast. As 
that hill is roached, the 
diesen: produced by these 
faults increases in amount; hence 
the observer meets with beds 
occupying a lower geological hor- 
izon the farther east he travels. 
At length this intricate system 
of faults and folds culminates 
in a great dislocation which, 
for convenience of descr ans 
and to distinguish it from 
apoack reversed faults, bo 
med a raga -plane. By 
aaa it great m of 
ooarealy: eryst stalline gneiss with 
pegmatite-veins, Pp 
ward of 400 feet thick, is placed 
above the Silurian rocks Sec- 
tion). A careful page singe of 
the mass a ca rna- 
zone of the quartzite ( false bediled 
grits) up to the limestone which 
overlies the Serpulite-grit. Ow- 
ing partly to its low hade and 
partly to eget ap folding, the 
outcrop of t rust-plane re- 
sembles that of an Fonality over- 
lying formation cut into sinu- 
ous line by denudation. It is 
admirably seen in dip-section on 
the east an orth slopes of 
Ben Arnaboll, whence it can be 
followed round the west face of 
descending into the 
the hill, 
