The occurrence of Monograptus in the Carmichael Burn section of the Midland Valley of Scotland has now been confirmed. A new fauna is described from beds previously regarded as Ludlovian which are here suggested to be of Valentian age. A detailed stratigraphical succession has been established and the structure of the area revised in the light of this new information, most of which was derived from a number of exploratory pits sunk for the purpose. Tentative correlations with the other Midland Valley inliers are attempted and many problems requiring future solution are raised.