(16) { 



ON THE AGE OF THE OLD RED SANDSTONE OF SHETLAND. 319 



(13) Hbddle, M. F., Mineralogical Magazine, vol. ii. (1879). 



(14) Hibbert, Samuel, A Description of the Shetland Islands, p. 160, etc. (1822). 



(15) Hooker, Joseph D., "Note on the Fossil Plants from the Shetlands," Quart. Jour. Geol. Sac., vol. ix., 



p. 49 (1853). 



Jameson, R., Outline of the Mineralogy of the Shetland Isles, p. 15, etc. (1798). 



,, ,, The Mineralogy of the Scottish Isles, vol. ii., p. 195, etc. (1800 and 1813). 



(17) Kidston, E., Catalogue of Palaeozoic Plants in the British Museum, pp. 233 and 238 (1886). 



(18) Mackie, W. S., Sand Grains, Elgin (1894). 



(19) Memoirs of the Geological Survey of Scotland : " The Geology of Lower Strathspey." 



(20) Min. Mag., vol. ii., p. 156. 



(21) Murchison, Sir Roderick I., "Note on the Age and Relative Position of the Sandstone containing 



Fossil Plants in the Shetland Isles," Quart. Jour. Geol. Soc, 

 vol. ix., pp. 50 and 50 bis. (1853). 



(22) ,, ,, " On the Succession of the Older Rocks in the Northernmost Counties 



of Scotland, with some Observations on the Orkney and Shetland 

 Islands," Quart. Jour. Geol. Soc, vol. xv., p. 353 (1859). 



(23) „ „ Siluria (4th ed.), p. 259(1867). 



(24) Nature, Nov. 23, 1899, vol. lxi., p. 80. 



(25) Neill, Patrick, A Tour through some of the Islands of Orkney and Shetland, p. 72, etc. (1806). 



(26) Nbwberry, J. S., Palosozoic Fishes of N. America, p. 92 (1889). 



(27) Peach, C. W., Quart. Jour. Geol. Soc, vol. xxxv., p. 811 (1879). 



(28) Peach, B. N., and Horne, J., " The Glaciation of the Shetland Isles," Quart. Jour. Geol. Soc, vol. 



xxxv., p. 778 (1879). 



(29) „ „ " The Old Red Volcanic Rocks of Shetland," Trans. Roy. Soc. Edin., vol. xxxii., p 359 



(1884). 



(30) „ „ "The Geology of Shetland," in Tudor's The Orkneys and Shetland { 1883). 

 , Rupert Jones, T., Quart. Jour. Geol. Soc, vol. xv., p. 404. 



) „ ,, On Fossil Estherise and their Distribution, ibid., vol. xix., p. 140 (1862). 



1 ,, ). "Monograph of the Fossil Estherise," Palseontographical Society, p. 14 (1862). 



Geol, Mag., 1890, pi. xii., and 1891, p. 50. 



(32) Salter, J. W., " On some Remains of Terrestrial Plants in the Old Red Sandstone of Caithness," Quart. 



Jour. Geol. Soc, vol. xiv., p. 72 (1858). 



(33) Sedgwick, A., and Murchison, E. I., "On the Structure and Relations of the Deposits contained 



between the Primary Rocks and the Oolitic Series in the North of Scotland," 

 Trans. Geol. Soc, ser. ii., voL iii., p. 125 (1828). 



(34) Shireff, Agriculture of the Shetland Islands (1814). 



(35) Traquair, R. H., "On Cephalaspis magnifica (Traq.)," Proc Roy. Phys. Soc. Edin., vol. xii., p. 269 



(1893). 



(36) ,, ,, "Notes on the Devonian Fishes of Scaumenac Bay and Campbelltown in Canada," 



Geol. Mag. [3], vol. vii., 1890, p. 16. 



(37) Tuffnell, Henry, "Notice of the Discovery of Fossil Plants in the Shetland Isles," Quart. Jour. Geol. 



Soc, vol. ix., p. 49 (1853). 



