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Sep 2013 - Devon
RGS Field Trip to Ilfracombe
21st -23rd September 2013
Unconformity, Saunton Sands
Upper Devonian Pilton Shales overlain by “Sandrock” of Upper Pleistocene
Unconformity, Saunton Sands
Upper Devonian Pilton Shales overlain by “Sandrock” of Upper Pleistocene
Earlier beach level in shallow water marine sands
Pleistocene deposits on raised fossil platform of the Upper Devonian strata
Pink granite erratic
Either lag deposit from eroded glacial till (?Anglian) or dropstone from grounded iceberg
Head at top of the cliffs, south of Baggy Point
Solifluction slope deposits showing possible frost-crack features
Rapparee Cove; Ilfracombe Slates Formation, comprising Kentisbury Slates Member
Normal fault trending NW-SE
Sequence of distal turbidites in east side of cove
Cleavage developed in low grade metamorphism of Variscan orogeny
Compression caused by a higher grade metamorphism has sheared thin sandstone bed
Sandstone more competent than mudstone
Hele Bay – our leader taking advantage of a useful bin as a table
Ilfracombe Slates Formation, Combe Martin Slates
Combe Martin Beach, marker bed, called Holey Limestone
Combe Martin had been an important area for mining, 14th to 17th centuries
Prospecting for silver; small patches of galena and zincblende
Evidence of mineralisation thought to have occurred in the Permian