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Sep 2013 - Devon

RGS Field Trip to Ilfracombe
21st -23rd September 2013

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Towards Baggy Point

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Unconformity, Saunton Sands
Upper Devonian Pilton Shales overlain by “Sandrock” of Upper Pleistocene

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Cross bedding in “Sandrock””

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Earlier beach level in shallow water marine sands
Pleistocene deposits on raised fossil platform of the Upper Devonian strata

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Pink granite erratic
Either lag deposit from eroded glacial till (?Anglian) or dropstone from grounded iceberg

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Discussion about erratics.....

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Other activities of a non-geological nature in Croyde Bay

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Stalwarts of the RGS

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View of unconformity from the beach looking north-east

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Head at top of the cliffs, south of Baggy Point
Solifluction slope deposits showing possible frost-crack features

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Another photo of the head deposit

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Clasts of bedrock and Patella sp., lithified head deposit

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Towards Baggy Point

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Ripple marks on bedding plane of Pilton Shales

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South-west to Croyde Bay

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View from Baggy Point
Thick mist!

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Rapparee Cove; Ilfracombe Slates Formation, comprising Kentisbury Slates Member
Normal fault trending NW-SE

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Fault gouge or breccia in disrupted sediments along the thrust plane

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Slickensiding along part of fault plane

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Sequence of distal turbidites in east side of cove
Cleavage developed in low grade metamorphism of Variscan orogeny

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Small scale folding and saddleback structures in west side of cove

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“Verity” by Damien Hirst, Ilfracombe Harbour

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“Verity” by Damien Hirst, showing her innards in more detail!

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History of Tunnels Beaches
Days of Victorian splendour

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“Ladies' Beach”; Ilfracombe Slates Formation, comprising Kentisbury Slates Member

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Compression caused by a higher grade metamorphism has sheared thin sandstone bed
Sandstone more competent than mudstone

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Quartz vein interrupted by stretching and shearing exhibiting boudinage

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Enthusiastic RGS-ers!

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Hele Bay – our leader taking advantage of a useful bin as a table
Ilfracombe Slates Formation, Combe Martin Slates

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Classic isoclinal overturned folds
Variscan fold pressure from the south

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Chondrites burrows exposed on bed or foliation plane

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Combe Martin Beach, marker bed, called Holey Limestone
Combe Martin had been an important area for mining, 14th to 17th centuries

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Prospecting for silver; small patches of galena and zincblende
Evidence of mineralisation thought to have occurred in the Permian