Earthwatcher's photos with the keyword: Broad Haven

Disharmonic recumbent fold at Broad Haven - view along the fold crest . 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. The relatively strong sandstone beds (orange-brown) have deformed into an angular chevron-shaped fold, while the softer seatearth below the coal has deformed into a rounded fold, seen in the lower part of the structure, almost from the camera viewpoint. This has been achieved by considerable slip along individual bedding planes and softer, incompetent, material has been squeezed into the hinge zones from the fold limbs. This has occurred particularly along the horizon of a thin coal seam and the immediately overlying dark shales, which have 'flowed' into the angular apex of the fold to the left of centre. The seatearth is also cut by a coarsely-developed axial planar cleavage, which is partly responsible for the 'nubbly' texture on the rounded part of the fold. The cleavage fans out almost radially, best seen in section on the rounded bed in the middle distance.

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.

Disharmonic recumbent fold at Broad Haven - general view . 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. The fold is disharmonic - individual beds in the fold have become detached and are no longer concentric with each other, as can be seen above and to left of centre. This has been achieved by considerable slip along individual bedding planes and softer, incompetent, material has been squeezed into the hinge zones from the fold limbs.

This photo shows the cliffs in the small sandy bay known as The Settlands between Little Haven and Broad Haven in Pembrokeshire, west Wales. The rocks here are Upper Carboniferous Coal Measures and are part of the western extremity of the Pembrokeshire coalfield. The strata have been severely deformed by compressional tectonics during the Hercynian (Variscan) earth movements. In the centre of the photograph the rocks are folded into a recumbent fold, with the axis near horizontal - a sort of tilted " < " shape. A thrust fault separates this fold from the steeply dipping, inverted rocks on the LH side. These form the headland known as The Rain . Scanned from a Kodachrome 64 transparency.