Hele Bay, Ilfracombe, and Combe Martin, Devon
.
Ilfracombe Bay. SS 529 474
Structure/Foliation/85_408. Pressure solution cleavage. Note the narrow
dark bands crossing
the sandy mudstone beds. Quartz has been removed from these bands and
deposited
in quartz veins nearby. The more massive layers have fewer dark
solution
bands running across them. [SS529474;
51.210233,-4.112678]
Structure/Foliation/
85_409. Note the relatively quartz rich microlithons (lighter layers)
crossing several of the dark layers. [SS529474;
51.210233,-4.112678]
Structure/Foliation/
85_410. This outcrop is crowded with microlithons of relatively
quartz rich material alternating with darker bands from which the
quartz
is removed. [SS529474; 51.210233,-4.112678]
Structure/Foliation/
85_413. Pressure solution cleavage, with shears and folds. [SS529474;
51.210233,-4.112678]
Structure/Foliation/
85_411. Pressure solution concentrates in high stress zones, such as
the cusps of folds. [SS529474; 51.210233,-4.112678]
Structure/Foliation/
85_412. Pressure solution cleavage, with folded quartz veins showing
the shortening involved is greater than 50%. [SS529474;
51.210233,-4.112678]
Hele Bay
Structure/Fold/Folds1/85_404.JPG. Asymmetrical folds and
cleavage. Hele Bay, Ilfracombe,
Devon,England. [SS532475; 51.212707,-4.093795]
../Structure/Veins/85_405.JPG. Fold hinge with tension gashes.
Hele Bay, Ilfracombe,
Devon, England.
[SS532475; 51.212707,-4.093795]
The tension gashes indicate extension parallel to the fold hinge.
Combe Martin, Devon, England. [SS575475.
Structure/Fold/Transposed/85_415.JPG. Transposed sandstone lense along
cleavage. In this case,
apparent
transpositioon results from pressure solution. [SS575475;
51.209959,-4.032383]
Structure/Fold/Transposed/85_416.JPG. Pressure solution has isolated
the sandstone lenses that
originally
were part of a single bed. Further differentiation at higher grades
would
give the appearance of a gneiss.
[SS575475; 51.209959,-4.032383]
.
Structure/Fold/Folds1/85_428.JPG. Kink Folds in Carboniferous Culm
facies. England ,
Hartland
Quay, Devon, Eng. [SS225250; 50.995643,-4.531395]
These chevrons are a puzzle. One idea is that they develop from
conjugate
kinks with the migration of kink boundaries until the final
boundary
is vertical.
.
Structure/Fold/Folds1/85_423.JPG. Chevron folds with a tight
core. Hartland Quay,
Devon.
Structure/Fold/Folds1/85_421.JPG. Kink Fold with
saddle reef and
thrust. Hartland Quay, Devon.
[SS225250; 50.995643,-4.531395]
Structure/Foliation/85_518.JPG. Pressure solution and related tension
gashes running
horizontally
across the slide near the large vein. Hartland Quay,
Devon, England. [SS225250;
50.995643,-4.531395]
../Structure/Veins/85_425. Encephalon tension gashes in a shear
zone. Hartland Quay,
Devon, England.
[SS225250; 50.995643,-4.531395]
The cracks indicate a shear of the top to the right. The orientation
of the veins is perpendicular to the long axis of the strain ellipse.
Welcombe Mouth, N.
of Bude, Devon. [SS 212 181.
.
Structure/Fold/Folds2/85_440.JPG. Refolded recumbent fold. Upright
F2. Welcombe Mouth, N.
of Bude, Devon. [SS212181; 50.934558, -4.546003]
../Structure/Veins/85_439. Folded tension gashes. Welcome, north
of Bude, Devon,
England. [SS212181; 50.934558, -4.546003]
../Structure/Veins/85_441. Tension gashes offset on one limb of fold.
Welcome, north of
Bude, Devon, England. [SS212181; 50.934558, -4.546003]
.
Structure/Fold/Folds1/85_431.JPG. Chevron syncline and rounded
anticline. Northcott Mouth, N.
of Bude, Devon. [SS202085; 50.848006, -4.555493]
Structure/Fold/Folds1/85_429.JPG. Box fold. Northcott Mouth, N. of
Bude, Devon, Eng. [SS202085; 50.848006, -4.555493]
Structure/SSdikes/85_432.JPG. Ptygmatic sandstone dikes with 30%
vertical shortening. The
book lies on a bedding plane. The rocks are Carboniferous sandstone and
shale. England. Devon, N. of Bude, Northcott Mouth.
[SS202085; 50.848006, -4.5554933]
Structure/SSdikes/85_433.JPG. Folded dike with 30% shortening (close-up
of 85_432). England.
Devon, N. of Bude, Northcott Mouth. [SS202085; 50.848006, -4.555493]
Structure/SSdikes/85_434.JPG. Folded dikes. England. Devon, N. of
Bude, Northcott
Mouth.
[SS202085; 50.848006, -4.555493] John Cosgrove of Imperial
College.
Widemouth Bay, Cornwall. SS 200 030.
.
Structure/Faults/85_443.JPG. Dog leg on normal fault. Widemouth Bay,
north of Bude, Devon,
England. [SS200030; 50.794939,-4.558225]
Structure/Faults/85_442.JPG. Small normal faults showing tips to the
right. Widemouth Bay,
Devon, England. [SS200030; 50.794939,-4.558225]
Wanson Mouth, Cornwall, England. SS 195 012.
.
Structure/Fold/Folds1/85_507.JPG. Periclinal fold (i.e. plunge
change). Wanson Mouth, south
of Bude, Cornwall, England. [SS195012;
50.780958,-4.56418]
Structure/Fold/Folds1/85_506.JPG. Recumbent fold with cleavage.
Wanson Mouth, south of
Bude, Cornwall, England. [SS195012; 50.780958,-4.56418]
Structure/Foliation/85_508.JPG. Pressure solution pathways in
sandstone. Wanson Mouth,
N. of Bude, Devon. [SS193011; 50.780958,-4.56418]
Millook Haven, south of
Bude, Cornwall, England. [SS 183 003.
.
Structure/Fold/Folds1/85_509.JPG. Recumbent chevron folds.
Millook Haven, south of
Bude, Cornwall, England. [SS183003;
50.772364,-4.577193]
Structure/Fold/Folds1/92-008.JPG. Close up view of recumbent folds in
Carboniferous turbidite.
Millook Haven, Cornwall. [SS183003;
50.772364,-4.577193]
../Structure/Veins/85_511. Tension gashes on overturned limb. Millook
Haven, Cornwall. [SS183003;
50.772364,-4.577193]
../Structure/Veins/85_512. Core zone of recumbent fold with tension
gashes in the lower
limb. Millook Haven, Cornwall. [SS183003;
50.772364,-4.577193]
../Structure/Veins/85_513. En echelon tension gashes defining a series
of parallel shear
zones. Millook Haven, Cornwall. [SS183003;
50.772364,-4.577193]
../Structure/Veins/85_514. Tension gashes in a progressive shear.
Millook Haven, Cornwall. [SS183003;
50.772364,-4.577193]
../Structure/Veins/85_515. Tension gashes rotated during a progressive
shear. Millook Haven, Cornwall. [SS183003;
50.772364,-4.577193]
../Structure/Veins/85_516. Tension gashes in conjugate shears. Millook
Haven, Cornwall. [SS183003;
50.772364,-4.577193]
../Structure/Veins/85_517. Tension gashes rotated during a progressive
shear.
Millook Haven, Cornwall. [SS183003;
50.772364,-4.577193]
Tintagel and Boscastle, Cornwall
.
Tintagel, Cornwall. SX 052 890
Structure/Foliation/85_524.JPG. Tintagel slates. Tintagel, Cornwall,
England. Note the castle
ruins; legend has it that this was King Arthur's site of the Round
Table. Taken from [SX052890; 50.66742,-4.757384]
Boscastle, Cornwall. SX 095 915
.
Structure/Fold/Folds1/85_523.JPG. Fold tips. Boscastle, Cornwall,
England.
Structure/Fold/Folds1/92-009.JPG. Kinked foliation. Boscastle,
Cornwall.
[SX095915; 50.691844,-4.698765]
Structure/Fold/Folds2/85_520.JPG. F2 folds, horizontal axial plane,
with crenulation cleavage.
Boscastle, Cornwall. [SX095915; 50.691844,-4.698765]
Structure/Fold/Folds1/92-010.JPG. Recumbent folds in Devonian slate.
Boscastle, Cornwall. [SX095915; 50.691844,-4.698765]
Bodmin Moor
Structure/Joint/92_013.JPG. Horizontal offloading joints in granite.
Rough Tor, Bodmin
Moor, Cornwall, England. [SX147808; 50.597435,
-4.619614]
