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Ladies Cave Anticline
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Mist on the Preseli Hills, Pembrokeshire, Wales.
Wild ponies at Carn Briw, Mynydd Carningli
A grey day and a sombre mood at Landshipping Quay,…
Landshipping Pill, Pembrokeshire, at low tide on a…
Landshipping Memorial
Landshipping Memorial - names of fatalities
Landshipping Memorial description (Cymraeg)
Landshipping Memorial description
Storm beach at Aberbach, Pembrokeshire, Wales.
Pillow lavas at Porth Maenmelyn, Pembrokeshire
Old path to beach, Porth Maenmelyn, Pembrokeshire
Porth Maenmelyn, Pembrokeshire, Wales
Traeth Llyfn rock ridges, Pembrokeshire
Traeth Llyfn, Pembrokeshire
Lichen at Traeth Llyfn in the late afternoon sun
Pwlldawnau and Penbwchdy, Pembrokeshire
Abandoned 'slate' quarry, Abereiddi Bay, Pembrokes…
'Blue Lagoon' Abereiddi, Pembrokeshire
Along the crest
Disharmonic recumbent fold
A peaceful sunset at Marloes Sands
Looking up the Chimneys
Three Chimneys at Marloes
Illuminated bedding planes at Marloes
The Anvil and Renny Slip
Jack Sound and Skomer Island
Midland Isle and Skomer Island from Wooltack Point
Skomer Island and Wooltack Point, Pembrokeshire
Late afternoon sun at Marloes Sands, Pembrokeshire
Fox Hole anticline, Little Haven, Pembrokeshire
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Porth Selau sands 2
Porth Selau sands
Carn Llidi watches over Whitesands Bay
Ramsey Sound panoramic
The Bitches in Ramsey Sound
Carreg yr Esgob and Ramsey Sound
Ogof Golchfa near Porth Clais
Caerbwdy Sandstone at Porth Clais
Fishing at Porth Clais
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Hinge Zone
Disharmonic recumbent fold at Broad Haven - view of the hinge zone
On the north headland of Broad Haven, Pembrokeshire, is this spectacular fold structure in Coal Measures strata. The fold is essentially an anticline strongly overturned northwards (to the left) so that its fold axis is near to horizontal.
This photo shows a closer view of the hinge zone along the horizon of a thin coal seam and the immediately overlying dark shales, which have 'flowed' into the angular apex of the fold just to the left of centre. The relatively strong sandstone beds (orange-brown) have deformed into an angular chevron-shaped fold, while the softer grey seatearth below the coal has deformed into a rounded fold, seen in the lower part of the structure, to the right of centre.
The seatearth is also cut by a coarsely-developed axial planar cleavage (better seen in the previous photo), which is partly responsible for the 'nubbly' texture on the rounded part of the fold.
On the north headland of Broad Haven, Pembrokeshire, is this spectacular fold structure in Coal Measures strata. The fold is essentially an anticline strongly overturned northwards (to the left) so that its fold axis is near to horizontal.
This photo shows a closer view of the hinge zone along the horizon of a thin coal seam and the immediately overlying dark shales, which have 'flowed' into the angular apex of the fold just to the left of centre. The relatively strong sandstone beds (orange-brown) have deformed into an angular chevron-shaped fold, while the softer grey seatearth below the coal has deformed into a rounded fold, seen in the lower part of the structure, to the right of centre.
The seatearth is also cut by a coarsely-developed axial planar cleavage (better seen in the previous photo), which is partly responsible for the 'nubbly' texture on the rounded part of the fold.
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