Earthwatcher's photos with the keyword: valley
Marros west - cryogenic anticline and solifluction…
02 Apr 2019 |
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Marros Sands to Amroth
Just east of Amroth, we cross the county boundary into Carmarthenshire. The fine beach of Marros Sands, some 4 km east of Amroth is relatively isolated between Telpyn Point and Ragwen Point. There is no road access; the only way to get here is along the coastal paths, along the beach at lowest tide, or by boat.
At the western end of Marros Sands the Teague's Wood valley cuts down to the beach. The valley centre is filled with solifluction deposits ('Head') formed by freeze-thaw cycles of permafrost melting and refreezing at the end of the last glacial period (Devensian).
This is a closer view of the cryogenic anticlinal fold in the shales of the Bishopton Mudstone Formation The fold is probably due to valley bulging during melting of the permafrost. The fold is quite superficial and probably does not extend more than a few metres into the sub-surface.
Overlying the shales are angular, frost-shattered, shale fragments, possibly with some upward pointing ice-wedging structures. This is overlain in turn by a paler, angular, solifluction 'Head' and modern river alluvium, mostly sand with rounded pebbles and cobbles. See notes.
The walking stick is approx. 90 cm long
Marros west - cryogenic anticline and solifluction…
02 Apr 2019 |
|
Marros Sands to Amroth
Just east of Amroth, we cross the county boundary into Carmarthenshire. The fine beach of Marros Sands, some 4 km east of Amroth is relatively isolated between Telpyn Point and Ragwen Point. There is no road access; the only way to get here is along the coastal paths, along the beach at lowest tide, or by boat.
At the western end of Marros Sands the Teague's Wood valley cuts down to the beach. The valley centre is filled with solifluction deposits ('Head') formed by freeze-thaw cycles of permafrost melting and refreezing at the end of the last glacial period (Devensian).
In the centre is a cryogenic anticlinal fold in the shales of the Bishopton Mudstone Formation The fold is probably due to valley bulging during melting of the permafrost. The fold is quite superficial and probably does not extend more than a few metres into the sub-surface.
Overlying the shales are angular, frost-shattered, shale fragments, possibly with some upward pointing ice-wedging structures. This is overlain in turn by a paler, angular, solifluction 'Head' and modern river alluvium, mostly sand with rounded pebbles and cobbles. See notes.
The walking stick is approx. 90 cm long.
Marros west - Teague's Wood and drift-filled valle…
02 Apr 2019 |
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Marros Sands to Amroth
Just east of Amroth, we cross the county boundary into Carmarthenshire. The fine beach of Marros Sands, some 4 km east of Amroth is relatively isolated between Telpyn Point and Ragwen Point. There is no road access; the only way to get here is along the coastal paths, along the beach at lowest tide, or by boat.
At the western end of Marros Sands the Teague's Wood valley cuts down to the beach. The valley centre is filled with solifluction deposits ('Head') formed by freeze-thaw cycles of permafrost melting and refreezing at the end of the last glacial period (Devensian).
Little Barton Strand
07 Nov 2009 |
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Little Barton Strand is a rocky inlet just north of Pencannow Cliff and Crackington Haven, notth Cornwall.
The stripy rocks are interbedded grey shales and turbidite sandstones of the Crackinton Formation (upper Carboniferous), which are mostly inverted - turned upside down - by the Variscan earth movements at the end of the Carboniferous.
This locality is also where the truncated Cleave valley terminates abruptly. Its waterfall can be seen on the far right plunging over a near vertical lip on to the rocky beach.
Pentargon panorama
02 Nov 2009 |
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A panorama composed from four portrait-style photos joined using Canon's PhotoStitch software.
Just north-east of Boscastle, the short, steep-sided Pentargon valley ends abruptly, its waterfall plunging 120 ft over the sheer lip into the Pentargon inlet below. There are a number of these truncated valleys on the north Cornwall coast. Few of them extend far inland and often end with a spectacular, if small, waterfall over a vertical drop to the beach below.
The rocks are shales with thin turbidite sandstones - part of the Crackington Formation (upper Carboniferous) - which are deformed into tight horizontal recumbent folds.
Little Barton Strand westwards
07 Nov 2009 |
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Little Barton Strand is a rocky inlet just north of Pencannow Cliff and Crackington Haven, notth Cornwall.
The stripy rocks are interbedded grey shales and turbidite sandstones of the Crackinton Formation (upper Carboniferous), which are mostly inverted - turned upside down - by the Variscan earth movements at the end of the Carboniferous. The upper surface of slab in the middle foreground displays superb sole structures on what would have originally been its base, but has subsequently been inverted.
This locality is also where the truncated Cleave valley terminates abruptly. Its waterfall can be seen on the right plunging over a near vertical lip on to the rocky beach.
The end of the Cleave valley
07 Nov 2009 |
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Here the truncated Cleave valley terminates abruptly. Its waterfall is just out of sight in the shadowed gully on the right plunging over a near vertical lip on to the rocky beach of Little Barton Strand. Castle Point is just out of shot to the left.
The Cleave valley
07 Nov 2009 |
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Just inland from its truncated termination at Little Barton Strand, the Cleave valley heads inland, but running nearly parallel to the coast for a short distance just east of Castle Point.
Purple on gold
07 Nov 2009 |
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Heading out of the Cleave valley towards Castle Point on the South West Coast Path, amid a spectacular carpet of furze and heather.
Fair weather cumulus over Morwenstow
08 Nov 2009 |
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Originally uploaded for the Guesswhere UK Group.
This is a view east to Morwenstow church and vicarage, north Cornwall, taken from the South West Coastal Path on the north flank of yet another elevated truncated valley which ends abruptly with a waterfall falling over a lip on to the shore.
www.cornwall-calling.co.uk/churches/morwenstow-church.htm
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