. Bulletin of the British Museum (Natural History), Geology. 18 S. H. WILLIAMS Lapworth's major stratigraphical synthesis 'On the Moffat Series' was published in 1878, where he established beyond doubt the precise, ordered stratigraphical change in graptolite assemblages through the sequence of black and grey shales. With the exception of the Glenkiln Shale (best developed at Glenkiln Burn, south-east of Moffat) and the lowermost portion of the Lower Hartfell Shale (best exposed at Hartfell Spa, north of Moffat), Lapworth used the Main Cliff and Linn Branch sections of Dob's Linn as the standa
. Bulletin of the British Museum (Natural History), Geology. 18 S. H. WILLIAMS Lapworth's major stratigraphical synthesis 'On the Moffat Series' was published in 1878, where he established beyond doubt the precise, ordered stratigraphical change in graptolite assemblages through the sequence of black and grey shales. With the exception of the Glenkiln Shale (best developed at Glenkiln Burn, south-east of Moffat) and the lowermost portion of the Lower Hartfell Shale (best exposed at Hartfell Spa, north of Moffat), Lapworth used the Main Cliff and Linn Branch sections of Dob's Linn as the standard reference for the Moffat Shale. While working at Dob's Linn, Lapworth stayed at Birkhill Cottage only a few hundred metres above the locality. The uppermost black shale division of the group was named after this cottage. Lithological sections measured at Dob's Linn, together with graptolite assemblages and biostratigraphical divisions, were figured by Lapworth (1878: figs 27-30) in his major work, where the lithostratigraphical division of the Moffat Shale was also clearly defined. An earlier, less detailed log of the Moffat Shale from Lapworth's notes, covering the Glenkiln Shale to basal Birkhill Shale, is still preserved in Birmingham University, and is here illustrated for comparison (Fig. 1). Note that Lapworth's assignment of the lower part of the Upper Hartfell Shale to the 'Belcraig Shale' (after Beldcraig Burn near Moffat) was apparently never published. During this research, Lapworth was appointed in 1875 to an Assistant Mastership at Madras College, St Andrews. In 1881 he was elected to the Chair of Geology at the recently established Mason College, Birmingham, which subsequently became the University of Birmingham. In addition to elucidating the structure of the Southern Uplands, Lapworth established the Ordo- vician System in 1879, solving the embittered feud between the schools of Murchison and Sedgwick (see Bassett 1985). He also made an equally painstaking, d
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