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Published online by Cambridge University Press: 01 May 2009
The limestone xenoliths about to be described were collected on the eastern side of Barnavave from a disused quarry situated at the junction between the “junction hybrids” and the surrounding Carboniferous limestone. The material comes from loose blocks left over during quarrying operations. Both the hybrids and the metamorphosed limestones have been dealt with in detail elsewhere1 and will only be referred to incidentally here.
page 88 note 1 Nockolds, S. R., Geol. Mag., 72, 1935, 289 (junction hybrids; the quarry is shown in Text-fig. 1).CrossRefGoogle Scholar Osborne, G. D., Geol. Mag., 69, 1932, 209 (the metamorphosed limestones).CrossRefGoogle Scholar
page 88 note 2 Osborne, G. D., op. cit., 222.Google Scholar
Nockolds, S. R., op. cit., 291.Google Scholar
page 90 note 1 It may be of interest to outline the manner in which these narrow reaction rims were separated from the cores. A number of very thin slices were cut right across the xenolith and the material forming the reaction rim could then be broken off from the remainder of the slice with a pair of forceps. In this way sufficient material was gradually collected for analysis.Google Scholar
page 90 note 2 The results were given originally by Dr. Mitchell in parts per million of the element concerned. They are here given in the more familiar form of weight per cent of the oxide.Google Scholar