Abstract The Highland Border Complex refers to a variety of rock-types exposed in a scattering of much-faulted outcrops lying along the Highland Boundary Fault that extends northeastwards from the Island of Arran to Stonehaven (Fig. 3). No unified stratigraphical scheme can be applied across the outcrops, and many units have not been formally named. Curry et al. (1984) reviewed the evidence for the ages of the various outcrops, and gave references to earlier work. The present chart is based on their compilation, and summarizes some of the sections, especially those at which some stratigraphical control is available. In several instances, elements of the Complex are seen to be unconformably overlain by the Lower Old Red Sandstone, which forms the steep northern limb of the Strathmore Syncline of the northern part of the Midland Valley of Scotland. The problem of the age of the Dalradian Supergroup has been much discussed. Although the lower divisions are of Proterozoic age and recent work affirms the continuity of the Ben Ledi and Keltie Water Grit formations with the Leny Limestone of late Early Cambrian age (Harris et al. 1998; Tanner 1998), Molyneux (1998) has re-opened the possibility that a part of the uppermost Dalradian succession, including the Macduf Slates is, at the oldest, of early Ordovician age.