Note 250 — Chapter XXXVIII · THE BASALT-PLATEAU OF THE PARISH OF SMALL ISLES—RIVERS OF THE VOLCANIC PERIOD
Reading edition
Henslow, Trans. Camb. Phil. Soc. (1821), vol. i. p. 408; Mr. Harker, Geol. Mag. (1887), p. 414. Mr. W. W. Watts suggests a comparison with the hexagonal bodies figured by Mr. Monckton in an altered limestone from Stirlingshire: Quart. Journ. Geol. Soc., vol. li. p. 487.