On Grooved and Striated Rocks in the Middle Region of Scotland

abrasion and grooving Agassiz and-tail angle arrow 16 Arthur Seat blocks bottom boulder clay channel chlorite slate clay-slate Comrie Corstorphine Hill covered with grooves crag debacle deep deposited depth diluvium direction distinct groove east and west east end east side Fenton Tower filled found grooves furrows glace glacial glacier Glen Gosford Grampians granite grooves running grooving agent half a mile height high water line horizontal inch in breadth inches broad islet land Loch Awe Loch Earn Loch Etive Loch Goil Loch Laggan Loch Long mer de glace mountains north face northward numerous ocean Pentland Hills Pentlands polished Professor Forbes prominent rocks quarry ravine ridge rivers sandstone Scotland seen shew shewn Sir James Hall smoothed south side southward Spean Stirling stones and gravel striæ and grooves striated rocks tion Torduff Hill Torwood ungrooved valley vertical surface visible wave west end west side yards