272 ON THE PARTICULAR ORDER OF 



rock, and with argillaceous, micaceous, hornblende, 

 and chlorite schists; to omit all notice of serpentine 

 and diallage rock. It is regularly succeeded by ar- 

 gillaceous schist in the islands which skirt North 

 Hist; and they are found together in lona, in dif- 

 ferent parts of Rossshire, and in Sutherland. But to 

 cut short an enumeration which it is useless to pro- 

 long, gneiss is immediately followed by the old red sand- 

 stone through a very extensive tract in Invernessshire 

 and the neighbouring country; and, in Morven, by a 

 series resembling that of Sutherland, consisting chiefly 

 of Lias and its lignites, or coal, to the exclusion of all 

 the intermediate substances. Even the Trap of this 

 last district, a rock confessedly later than the last 

 secondary stratum that exists, reposes here on the 

 gneiss, as it also does in Mull. 



Some of these examples may be considered merely 

 as proving the omissions of particular strata; but 

 many of them are, in fact, irregularities of alternation. 

 Lest however any doubt should remain respecting the 

 possibility of these strata being actually transposed, 

 a few decided examples of that nature may be quoted. 

 Hornblende schist is found alternating with every 

 rock in the whole series, as is limestone. The same 

 nearly is true of Argillaceous schist and of Diallage 

 rock. In Jura and the adjoining islands, quartz rock, 

 micaceous schist, and argillaceous schist, occur in an 

 endless succession of alternations; and to these are 

 added, in Isla, Gneiss and Limestone. On the opposite 

 coast of Argyllshire, the alternations of chlorite schist, 

 micaceous schist, quartz rock, and hornblende schist, 

 amount to many thousands; and even gneiss, lime- 

 stone, and argillacous schist, are sometimes added to 

 these four. The term subordinate, it is true, has been 

 invented to get rid of this objection, as I shall pre- 



