3 - Aberdaron to Porth Oer
Trwyn Maen Melyn
A multicoloured Headland of Limestone , Quartzite , Basalt
Rocks of the Gwna Melange , from the Precambrian Period
St. Mary's Well is at the Head of this inlet.
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The Gwna Group are a chaotic collection of sedimentary and igneous rocks some 610 million years old.
Since deposition the group as a whole has been subject to low grade metamorphism producing rocks of many colours.
Ref: NW 197
Date: 10/10/2021
Location: SH 1423 2478
