South Cornwall - Geology
Lamprophyre Dyke - Helford River (S25)
A Dyke of Igneous rock intruded into the Sandstone/ Grey Slates of the
Portscatho Formation , on the Northern bank of the Helford River.
Lamprophyre is a hydrothermally altered ,fine-medium grained , reddish
brown rock intruded at or just before the main period of Granite Intrusion, a
type of Rock found in Cornwall and Devon.
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Location - South of Mawnan Church - Mouth of Helford River in Gallery 25
The Dyke is to the east of Shag Rock - between Parson's Beach and Rosemullion Beach .
Ref: 3440
Date: 08/06/2016
Location: SW 7911 2719