362 ' GEOLOGICAL APPEARANCES 



139. At the junction of the Chlochan, the cliannel of the Tilt 

 turns at a large angle to the northward, and preserves nearly 

 the same direction to the junction of the TarfF, a distance of 

 about half a mile. The TarfF flows from the west, and, imme- 

 diately before it joins the Tilt, issues from a deep chasm form- 

 ed by precipices on either side of the channel, which, near the 

 outlet, is broken by two considerable falls. This spot is called 

 PuU Tarff. Between the junction of the Chlochan and Pull 

 TarfF, there appear at intervals various stratified I'ocks, consist- 

 ing of granular limestone, mica-slate, the dark-gi-ey aggregate, 

 and granular quartz. Out of five positions observed with the 

 clinometer, if we omit one that ajipeared to be owing to a con- 

 volution, the rest argue that these strata lie round, and lean 

 against, the base of the mountain, which separates the valleys of 

 the TarfF and the Tilt. Four observations gave successively 

 N. 150° E., 128" E., 133' E., and 101' E. ; while the dip was 

 getting round by the east to the north *. Our observations in 

 this quarter terminated at Pull TarfF. Dr Hutton mentions f , 

 that to the eastward of this, near Falar, he found both granite 

 and primary strata between Glen More and Glen Beg. In fol- 

 lowing up the course of the TarfF to the westward, he observed 

 that the strata disclosed by that river, while they stretched 

 about east and west, dipped to the northward. In Glen Tarff 

 he met with many tumbled stones, which he describes as 

 " composed of broken schistus, including white granite," by 

 which he of course means fragments of primary strata, inter- 

 sected by veins of white granite. He also ascended to the 

 summit of the ridge that separates the TarfF from the Tilt, 

 where he found almost every thing to be granite, and but little 

 of the primary strata. 



140. The 

 ^, " 



* See note D. 



•f In the manuscript, of which some account is given in note C. 



