1. Geology of Camaret-sur-Mer, Brittany
Ellis Evison. 10 July- 20 August 2014. 48.2767° N, 4.5956° W
Cross Section
Generalised Vertical Section Location Maps
Crozon
Camaret sur Mer
Morgat
Telgruc sur Mer
5
Rennes
Saint-Brieuc
Lorient
Quimper
Brest
Crozon
Rennes
Nantes
Paris
Lyon
Bordeaux
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
Thickness(m)
M
ud
Silt
F M C
Sand
LSSh
Ms
a
Base not seen
C
P
KSSt
VMs
MsK
TGSSt
Qz
High
Low
Relative
Sea Level
KSMs
45
46
3638
45
77
70
31
29
3735
72
65
23
19
34
25
27 30
32
26
30
31
49
31
53
57
57
54
31
60
44
45
59
47
51
4046
394248
54
63
46
53
50
51
60
72
70
67
64
47
50
57
55
57
61
5765
69
76
70
72
69
62
71
64
60767966
60
5665
52
65
54
57
64
66
53
F
F
F
F
534700053460005345000
380000 381000 382000 383000 384000 385000379000 386000
Normal
Fault
Trinucleus
Trilobite Monograptus
Graptolites
Ripple
marks
Hummocky cross
stratification
29
31
27
29
P
P
MsC
MsC
KSSt
LSSh
TGSSt
P
VMs
K
MsC
KSMs
Qz
Qz
Qz
Ms
Sand Dunes
2°
0m 250m 500m
1:10000
KEY
F
F
Solid Geological
Boundary
Inferred Geological
Boundary
Drift Boundary +
Break of Slope
Strike + Dip
of Bedding
Striation
Fault
Line of
Cross Section
Pen Hir
Quartzite
Camaret
Mudstone
Kermeur
Sandstone
Veryac’h
Mudstone
Lamm Saoz
Shale
Kernevez
Mudstone
Ty ar Guen
Sandstone
Kersiguenou
Mudstone
High
Low
Notes ChronostratigraphyBiodiversity
OrdovicianSilurianDevonian
WenlockLochkovian
Brioverian 700-900Ma
ArenigLlanvirnCaradoc
Ashgill
485-470470-464458-449
449-443
428-423417-412
Ty ar Guen Sandstone - Asymmetric
ripples. Brachiopods, crinoid, tabulate
coral. Base defined by colour change.
Kernevez Mudstone - Brachiopods.
Base defined by grain size increase
Lamm Saoz Shale - Organic rich,
Graptolites. Base defined jet black colour
Veryac’h Mudstone - Ball/pillow, slumps
beds. Base defined by colour change.
Kermeur Sandstone - Eastern half,
white. Western half, dark grey.
silt laminations throughout, sigmoidal
fold. Ripple marks. Bioturbation index; 5.
Base defined by change in grain size;
coarser grains (sands)
Camaret Mudstone - Muds, sporadic
laminations of silt. Dense accumulation
of lingulid brachiopods. Crinoid and
Trinucleus Trilobite present. Planolites
burrows. Phosphatic nodules on
wave cut platform. Base defined by
colour change; grey/white to dark grey/
black.
Pen Hir Quartzite - Massive sands,
quartz pebbles seen at base.
Asymmetric lingoid ripples, mega ripples.
Hummocky cross stratification.
Thallasinoides, Diplocraterion trace
fossils. Base defined by colour change,
grey/white to dark grey.
Kersiguenou Mudstone - Base not seen.
Regional
National
Local
0 50 100 150 200
Kilometres
0 25 50
Kilometres
100
Kilometres
Period Epoch Age (Ma)
a
0m
100m
200m
0m
100m
200m
(329900,5346850)WNW
(385200,5345950)ESE
1 : 10000
0m 100m 200m 300m 400m
QzP MsC
Base not seen
QzP MsC QzPMsCKSSt
V
LSSh
K
TGSSt
Ms Ms
MsKS
Pen Hir
Quartzite
Camaret
Mudstone
Kermeur
Sandstone
Veryac’h
Mudstone
Lamm Saoz
Shale
Kernevez
Mudstone
Ty ar Guen
Sandstone
Kersiguenou
Mudstone
Brittany
Camaret-
sur-Mer