Journal of the Geological Society; February 1983; v. 140; no. 1;
p. 163-164; DOI: 10.1144/gsjgs.140.1.0163
© 1983 Geological Society of London
Discussion on a geochemical comparison of the Dalradian Leven Schists and the Grampian Division Monadhliath Schists of Scotland
Dr M. Ltherland writes: Whilst Lambert et al. noted that anomalous Rb and Y values from the ‘Leven Schists’ of Glen Creran may ‘imply that schists from another Dalradian horizon have been sampled’ (p.74), their fig. 1 shows only Appin Group under-lying the Loch Creran area, in contrast with previous workers, who also included Argyll Group (Iltay) rocks (Bailey 1922; Voll 1964; Rast & Litherland 1970; Litherland 1980).
The stratigraphic details of the Appin and Argyll Groups at Loch Creran are given in Litherland (1980). The Leven Schists sensu stricto, i.e. that formation which stratigraphically underlies the Ballachulish Limestone,are confined to the floor of Glen Creran and the NE-trending Airds Hill belt, where the unit exhibits facies changes.
Clearly, Lambert et al. sampled rocks other than Leven Schists in the Glen Creran area and, although no grid positions are given, if these rocks were the ‘coarsely-banded schists with alternating quartzose and black pelitic bands’ (p. 72), then they sampled Argyll Group or horizons above the Lismore Limestone. The east ward change (p. 72) from the ‘green laminated facies’ of the Leven Schists to the above rocks was probably noted at Glen Salachan, where the Bendeloch Slide divides the Leven Schists from the Argyll Group (Litherland 1980, 1982). However, doubts regarding my reinterpretation are excusable in this particular section, since similar striped and graded silt stones are found in close proximity on either side of the slide. That one of these striped siltstones belongs to the Leven Schists and the other
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