Strathan Skerray - Skerray Bay
Geological Conservation Review site | GCR #2972 | Structural and Metamorphic Geology | Moine
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Summary
This locality shows the western boundary of the Borgi Lewisian inlier with a coastal section through variably reworked Lewisian gneisses whose geochemistry suggests a possible Laxfordian origin. The boundary of the inlier is well-exposed [NC639631], it is located in a zone of high strain but is thought to represent a modified unconformity the inlier having been emplaced by complex (F2) Caledonian folding. The coastal section displays well-exposed hornblende and biotite gneisses, which between Lamigo and Skerray Bays have a geochemistry similar to the Laxfordian gneisses of the foreland. Immediately west of Skerray Bay a folded, but still crosscutting, amphibolite sheet may represent a deformed Scourie dyke. This coastal cross-section of a Lewisian-Moine boundary enables an appreciation of the nature of the sub-Moine basement and the degree of reworking of that basement during the Moine orogenesis.
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