AbstractI. Black's dating of the Tertiary lavas of Rhum as later than the Tertiary granophyre is accepted, as also his tracing of a fault along the contact of granophyre and Torridonian. This fault is interpreted as part of the Rhum ring‐fault, and a local transition between granophyre and Torridonian arkose is discussed.II. King's discovery of dissimilar contacts on the two sides of a Tertiary basalt dyke cutting Tertiary granophyre in Skye is explained on a mobilisation hypothesi