Upper Palceozoic Rocks . 
57 
At the western boundary of the Upper Palceozoic rocks, on the 
east side of the Macalister Hirer, near Glenmaggie, their lowest 
beds resting on the Silurian, are conglomerates, felstones, &c., 
analogous to those on the eastern margin. Between Glenmaggie 
and Glenfalloch, further up the Macalister, a tongue of Silurian 
rocks, extending from the main western mass of that group, pro- 
jects into the Upper Palceozoic area as far as Mount Hump, on 
the divide between the Macalister and the Avon. The lowest 
Upper Palceozoic rocks flanking this Silurian projection on either 
side are coarse conglomerates and breccias, followed by alternations 
Fig. 19. 
Sketch Section, showing general sequence of Upper Devonian rocks along 
line of dip from the Silurian boundary, north-west of Ben Cruachan to 
near upper end of Little Plain. 
a Silurian, b Upper Devonian conglomerate, c Melaphyres. d Conglomerate (con* 
taining mclaphyro boulders). c Melaphyre. / Coarse sandstone, g Porphyry, h Ilard 
fissile gritty shales, i to j Alternating conglomerates, thick and thin bedded. 
Enlarged Sections, illustrative of rocks between i and j in above Section. 
No. 1. 
a Thick-bedded coarsc-jointed micaceous 
sandstone. 
lb Soft purple shale Kinds. 
c Hard tine purple-brown micaceous sand- 
stone. 
c Fissile brown micaceous sandstone ; part 
of the band ferruginous and full of 
cavities. 
d Alternate bands of purple rubbly shale 
and hard purple-brown micaceous sand- 
stone. 
No. 2. 
act Thick-balded hard fine brown sand- 
stone. 
bb Finely gritty purple-brown rubbly shales. 
c Light bluish-grey finely gritty shale. 
d Hard brown sandstone. 
e Thick-bedded light bluish-grey coarse 
siliceous sandstone. 
No. 3. 
•a Rubbly purple-brown slmlc. 
b Hard coarse siliceous sandstone with fine- 
grained brown layer. 
c Fine hard rubbly siliceous grit. 
d Hard fine purple-brown sandstone, much 
jointed. 
e Hard rubbly bluish-grey shale. 
/ Hard fine grey siliceous sandstone with 
fissile bands. 
No. 4. 
a Conglomerate. 
b Coarse sandstone, showing false bedding 
and containing patches and hands of con- 
glomerate. 
c Dark-red rubbly fine sandstone and gritty 
Bhale. 
d Coarse sandstone. 
