268 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 7, 



on the broken edges. The fragments of Turritella somehow seldom 

 show these markings. 



5. The Glaciation of the Hocks and Boulders. — One of the objects I 

 had particularly in view was to note the direction of the glacial 

 markings on the rocks, and to ascertain whether they could be ac- 

 counted for by a movement of ice proceeding from the interior of 

 the country towards the coast. I therefore lost no opportunity of 

 noting the bearings of the scratches wherever I saw them. The 

 result showed a pretty uniform direction over the whole district, the 

 lines running N.W. and S.E. Thus : — 



At Eeay N. 45° to 55° W. 



Ditto at another place N. 50° W. 



About halfway between Forss and Eeay N.W. 



In the bed of the Forss water N. 45° W. 



On the top of Leurery hill (about five miles S.W. of Thurso) N. 55° to 60° W. 



At Scrabster harbour N. 30° W. 



On the top of a cliff near Skirza Head N. 65° W. 



In the bed of the Freswick stream N. 35° to 40° W. 



At Keiss harbour N. 35° to 40° W. 



At the new pier at Pulteney (Wick) N. 15° W. 



On the top of the cliff near the old castle of Wick N. 15° W. 



Some cross markings here pointing W. 15° S, 



In the bed of the Milton Burn (near Wick) N. 43° to 45° W. 



In the bed of the Haster Burn (near Wick), in several places 



finely displayed IS". 55° W. 



On a hill-slope between the streams of Dunbeath and Berrie- 



dale, on conglomerate, well marked N. 60. W. 



On the roadside, near Berriedale Church N. 60° to 65° W. 



Ditto, one mile south of Berriedale inn N. 45° W. 



Ditto, two miles south of Berriedale inn : N. 40° W. 



On Lumps of conglomerate (having an evident stos-seite on 



the N.W.) about two miles south of Berriedale N. 34° to 40° W. 



In the above the correction for compass variation has been applied. 

 Mr. Peach in reference to this subject says, " AU the grooves that I 

 have met with on the rocks below the clay in Caithness run N. and 

 S. with deviations to the E. and W. ; I have found them almost all 

 over the county." Upon inquiring of Mr. Peach, I find that his 

 bearings are by compass. Remembering, therefore, that the com- 

 pass in that district at present points fully 25° to the west of north, 

 it will be seen that his account of the matter nearly corresponds 

 with my own. 



The impression left upon me by all I saw was, that the movement 

 had been from north-west to south-east ; for where I observed any 

 indication of a Stosseite it was on the north-west side. In order to 

 obtain further evidence on this point, I endeavoured to trace the 

 boundary of the dark-grey drift; for I thought that, had the move- 

 ment come from the north-west, the dark-grey mud derived from the 

 Caithness flags should overlap the red grit and conglomerate towards 

 Dunbeath and Berriedale, while the flags themselves should be over- 

 lapped at their north-western boundary towards Reay by a dilferent- 

 coloured drift. This I found to be the case. The dark-grey mud fiUs 

 the bed of the Forss water, but does not extend beyond the watershed 

 between that stream and the Burn of Isauld ; and at Reay, the drift 



