1. Geological Map, Stratigraphic Column, and Geological Cross Sections of the Glen Achall area: Ullapool
Student No. 1102472
1km; 1000m
N
300
200
0
-100
-200 -200
-100
0
100
200
300
1420m1365 9695
1510 9680
100
eastwest
A B
Metresabovesealevel
A Q
P
F
F
Le
Ps
Ps
G
G
P
Le
Le
Q
A
PF
F
A
P
P
P
20 18 8 15 45 6 40
-200
-100
0
100
200
300
-100
0
100
200
300
Metresabovesealevel
C D
1170m eastwest
1475 9605 1565 9605
-200
-100
0
100
200
300
-100
0
100
200
300
A
Q
P
P
F
F
F
S
S
S
Lg
Lg
Lg
Le
Le
A
Ps
Ps
G
My
Series of foreland
lithology horse structures
15
10
20
A
A
A
Q
Q P
P
P
P
F
F
S
S
Lg
Lg
Le
A
My
My
Ps
Ps
G
G G
G
2870m
eastwest
1335 9575 1625 9560
-200
-100
0
100
200
300
-200
-100
0
100
200
300
-100
0
100
200
300
Metresabovesealevel
E F
18
10
18 23
12
16
20
30
1430m
eastwest
1310 9440 1450 9445
A
Q
Q P
P
FF
Lg
Lg
G
G
Ps
300
200
100
0
-100
-200
300
200
100
0
-100
-200
Metresabovesealevel
G H
12
10
18 14
300
200
100
0
-100
-200
1320 9475 1440 9465
Metresabovesealevel
1270m
eastwest
A
Q
P
F S
Lg
G
Ps I 300
200
100
0
-100
-200
I J
14 18
22 20 20
20
Cross Section Legend
Geological boundary
Unconformity surface
Fault - with
movement indication
Bedding orientation20
12
1km; 1000m
f
cl ff
cl
bcil
ccl
ml
ss
ss
f
f
c
c
bcil
cc
bcil
bcil
c
f
f
f
ml
ml ml
5
65
50
62
32
32
28
18
40 10
10
10
10
10
52
10
10
5020
15
30
25
40
50
6
14
32
6
24
30
28
2260
Applecross
Fm. (A)
Quartzite
(Q)
Pipe Rock
(P)
Fucoid
Beds
(F)
Eilean Dubh Fm.
(Le)
Ullapool Gneiss
(G)
Moine Psammite
(Ps)
Syenitic
Intrusion (I)
Mylonite
Salterella
Grit
(S)
Ghrudaidh Fm
(Lg)
Basaltic Dyke
(B)
P
P
P
P
P
P
G
Q
Q
Q
A A
G
A
Lg
Ps
Ps
Ps
Le
Le
Le
F
S
S
F G
A
S
Le
A
G
G
I
F S
F
Lg
B
B
A
A
Lg
Le
Le
Le
A
18
20
20
10
20
20
20
20
30
20
20
15
20
10
10
32
32
40
18
45
15
6
12
20
20
10
15
18
20
15
14
25
10
30
18
15
12
60
32
30
40
18
20
15
20
21
30
20
12
14
20
15
18
18
12
20
10
16
23 18
12
20
12
25
18
12
60
18
20
25
12
12
20
25
22
12
28 20
20
20
40
45
14
10
12
10
10
820
18
30
18
20
19
18
15
18
14
22
20
24
50
18
20
12
8
22
14
12
10
ss
10
bcil
18
c
28
cl
32
f
10
50
10
ml
5
15
Lithological Key
Limestone - Ghrudaidh Formation
Limestone - Eilean Dubh Formation
Salterella Grit
Fucoid Beds
Pipe Rock
Quartzite
Applecross Formation
Mylonite
Moine Psammites
Ullapool Gneiss
Syenite Intrusion
I
G
Ps
My
A
Q
F
P
S
Le
Lg
B
Basaltic Dyke
Light grey limestone, heavily fractured w/ quartz veins
Dark grey limestone with stylolitic silicate layers and quartz veins
Coarse grained grey-white quartz arenite
Dark grey siltstone interbedded with orange weathered calcareous mudstone (fossiliferous)
White and chemically altered pink medium grained quartz arenite;
heavily bioturbated, locally cross bedded at base
White quartz arenite; varying grain sizes from pebbles to medium sand, cross bedded
Arkosic Arenite; varying grain sizes from pebble to medium sand,
pink colour due to high K-feldspar content, pebbles
composed mainly of quartzite and vein quartz
Moine psammites with mylonitic fabric and shear indicators
(quartz fish and feldspathic mantled clasts)
Polymetamorphic grey quartzose psammites with green (orange weathered) bedding surfaces
indicating chlorite; some shiny surfaces show aligned muscovites in semi-pelitic layers
Feldspathic gneiss with high abundance of K-feldspar;
contains weakly aligned hornblende and local quartz megacrysts
Contains rhombic K-feldspars and has been deformed within Moine psammites,
concordant with bedding, therefore likely to be a sill
Hydrothermally altered Basaltic Dyke, containing plagioclase, pyroxene,
and retrogressive epidote/ chlorite
Geological Symbols
Legend
Boundaries
Bedding Orientation
Shear Sense Indicator
Bedding-Cleavage
Intersection Lineation
Cleavage Plane
Crenulation Lineation
Plunging Synform
Plunging Antiform
Fold Axial Plane
Mineral Lineation
Fault Plane Orientation
Geological Boundary
Extensional Fault
(ticks show downthrown block)
Reverse/ Thrust Fault
(barbs on hanging wall)
Cross Sections
A-B, C-D, G-H, I-J
Cross Section E-F
Stratigraphic Column
u/c
t
t
t
t
u/c
A
Q
P
F
S
Lg
Le
G
A
My
Ps
Multiple small scale
horse structures between Le and G
thrust nappes, composed of foreland
lithologies; the lithologies are spatially
sporadic and do not outcrop as
continuous nappes in the area
Neo-ProterozoicCambrian
Cross-bedded at unit base
Conglomeratic at unit base
Planar bedding at unit top