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In view of Mr. J. A. Butterfield's account of outgrowths on zircon in the Millstone Grit of the Pennine region (Geol. Mag., LXXIII, 1936, 511–16), it may be of interest to record the occurrence of similar grains in the Middle Jurassic sandstones of Yorkshire.
Mr. Brydone's letter in the GeologicalMagazine (1936, p. 329) provides an opportunity to make some postscript remarks on this subject. In addition I have received letters from Mr. H. J. Osborne White and Mr. F. W. Shotton, containing stimulating criticism and suggestions, and I am grateful to them forallowing me to quote from what they wrote.