Abstract
Since my account (1937) of the structure of a part of Cornwall and O Devon, I have re-examined in particular the area known as Roseland between the Dodman and Porthallow at the eastern end of the Lizard Boundary. This has led to a re-interpretation of the structure which, though in part concerned with the Gramscatho Beds, applies to a large area of Cornwall and Devon. In the last few years many workers have appeared in the area and I have been frequently asked for my views on the structure and succession. It is evident that my 1937 paper has given rise to some misconception regarding these views, and it is desirable to place on record a brief summary of the main conclusions to which I have been led by my work during the last twenty years (mainly since 1951).

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