The discovery of a late stage hastingsite gneissic granite in the Inchbae mass (possibly coeval with the riebeckite gneissic granite in the Carn Chuinneag mass) indicates that different physico-chemical conditions prevailed during the last granitic stages of the two masses. This, along with other evidence at the North and SE contacts, is in accord with a previous view that the Inchbae mass is at a different stratigraphic level (lower) relative to the Carn Chuinneag mass.

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