The Deerhope Formation of the Pentland Hills, near Edinburgh, is generally considered to be of late Telychian (late Llandovery) age (e.g. Robertson 1989; Bull & Loydell 1995; Clarkson et al. 2001). Evidence for a precise level in the graptolite biozonation has, however, thus far been lacking. The only published record of graptolites is that of Mykura (1960, p. 166) from the Deerhope Burn. Clarkson & Taylor (2002, p. 32) described this material as comprising ‘rare unidentifiable monograptids’. Bull & Loydell (1995) described graptolites from the underlying Reservoir Formation, exposed in the Gutterford Burn, and...

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