The Quarterly journal of the Geological Society of London . ioned consistof quartzose mica-schist and granite, on the flanks of which reposethick masses of conglomerate and grit forming the base of the OldRed in this region. These beds of conglomerate and grit pass upinto a great series of thin-bedded shales, flags, and sandstones, gene-rally of a dark-grey colour, which stretch away in billowy undulationsover the surface of the country to its north-eastern corner, as hasbeen well shown by Sir Eoderick Murchison. It is in the low troughs and winding hollows which form thebeds of the various st
The Quarterly journal of the Geological Society of London . ioned consistof quartzose mica-schist and granite, on the flanks of which reposethick masses of conglomerate and grit forming the base of the OldRed in this region. These beds of conglomerate and grit pass upinto a great series of thin-bedded shales, flags, and sandstones, gene-rally of a dark-grey colour, which stretch away in billowy undulationsover the surface of the country to its north-eastern corner, as hasbeen well shown by Sir Eoderick Murchison. It is in the low troughs and winding hollows which form thebeds of the various streams that we find any quantity of glacialdebris; on the higher ground the rocks are either bare and devoidof earthy cover, or hidden by a growth of peat and heather. Someof these low tracts run across the country from side to side, as, forexample, from Wick to Thurso by way of Loch Watten, and between 1866.] JAMIESON CAITHNESS. 263 Fig. 1.—Shetch Map of Caithness, showing the boundary of the darJc-grey drift, and the direction of the glacial DUNCAN9RY H SKIRDAH* FRELSWICK KEISS SINCLAIR BAY WICK LYBSTER BERRIEDALEORD OF CAITHNESS ^ I I I ^ Scale of English miles. Direction of glacial markingsBoundary of dark-grey drift. 264 PEOCBEDINGS OP THB GEOLOGICAL SOCIETY. [Feb. 7, Dunnet Bay and Sinclair Bay. Another low tract passes up the bedof the Thurso water and along to the east coast by way of drift is spread in sheets filling up these troughs and levellingthe irregularities of the rocky strata so as to impart a smoother andsofter outline to the surface. So far as I saw, it does not form irre-gular mounds and hillocks, neither is it very rough on the surfacewith erratic blocks; it seems confined in a great measure to thelower levels, thinning out at altitudes of 100 or 150 feet. Thethickness, therefore, varies much, being greatest in those depressionswhich descend nearly to the sea-level. Thus at Scrabster harbour,in Thurso bay, there are banks of it mo
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
