Abstract
A new map of the Mallaigmore area defines the area of the Lewisian gneiss more accurately than maps hitherto available, and shows the extent of transitional rock types produced by mechanical and metasomatic processes, occurring between the Lewisian and the Moine metasediments. Analyses of rocks from both major divisions show systematic differences in major elements and their ratios, but do not reveal any striking anomalies in minor element distribution. The criteria for recognising the Lewisian and the transitional rocks are given, and a major recumbent fold is postulated to account for the presence of the Lewisian.
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