CHAPTER VI.

The Lines of the Geographer rarely right Lines.--These last, however, always worth looking at when they occur.--Striking Instance in the Line of the Great Caledonian Valley.--Indicative of the Direction in which the Volcanic Agencies have operated.--Sections of the Old Red Sandstone furnished by the granitic Eminences of the Line.--Illustration.--Lias of the Moray Frith.--Surmisings regarding its original Extent.--These lead to an exploratory Ramble.--Narrative.--Phenomena exhibited in the Course of half an Hour's Walk.--The little Bay.--Its Strata and their Organisms, 95-108