The Quarterly journal of the Geological Society of London . nature occurring; it is animstratified pebbly silt, the greater part of the mass consisting offine sand. The upper part of the bank, on the other hand, is of abrowner, more ferruginous colour, much coarser in quality, withmore muddy sediment and few or no shells ; it is also full of stonesand large ice-worn boulders of sandstone, quartzose, mica-schist,and granite, on which the glacial scoring is well marked. One ofthese granite blocks is 12 feet in length. I cannot say thatthere is any clear sharp line of separation between this coar
The Quarterly journal of the Geological Society of London . nature occurring; it is animstratified pebbly silt, the greater part of the mass consisting offine sand. The upper part of the bank, on the other hand, is of abrowner, more ferruginous colour, much coarser in quality, withmore muddy sediment and few or no shells ; it is also full of stonesand large ice-worn boulders of sandstone, quartzose, mica-schist,and granite, on which the glacial scoring is well marked. One ofthese granite blocks is 12 feet in length. I cannot say thatthere is any clear sharp line of separation between this coarse upperstuff and the dark siltier matter beneath ; for although in some placesthe distinction is pretty well marked, in others they seem to gra-duate into each other. Where the rock rises in the cliff, the darksilty portion thins out, and the coarse brown mud full of bouldersrests immediately upon the ice-worn surface of the Caithness flags. VOL. XXII. PART I. U 266 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 7, Fig. 4.—Section at Keiss , 1. Eeddish-brown stony clay. 2. Dark-grey pebbly silt with broken shells. 3. Sandstone, iceworn. At Keiss harbour, which hes seven or eight miles further to the north,the character of the section is very much the same as at total thickness of the drift near the harbour is about 40 lowermost 23 feet consist of an unstratified mass of dark sandy-mud, with a few broken shells and some stones dispersed throughit, which reposes directly upon the ice-worn surface of a red sand-stone rock, without the intervention of any other deposit. Thescratches and grooves point W. 35° to 40° W., and some of theimbedded stones are likewise scratched. The upper 17 feet of thebank consists of a browner coarse mud with more stones, and, so faras I observed, no shells. Although the lowermost sandy portion ofthe drift at Keiss and Wick has no distinct stratification, it is never-theless more like an ordinary marine deposit than wha
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
