Transactions of the Royal Society of Edinburgh . ^ <%k^^~^^ Fig. 23.—Section in WardlawQuarry, Fig. 24.— Section of Calton Hill, Edinburgh. of this thoroughly volcanic series of rocks passes conformably under theCalciferous sandstones and shales shown at the right hand of the diagram. As the interstratified lavas and tuffs were laid down in sheets at the surface,they necessarily behave like the ordinary sedimentary strata, and have under-gone with them the curvatures and fractures which have affected this regionsince Carboniferous times. Notwithstanding their volcanic natu
Transactions of the Royal Society of Edinburgh . ^ <%k^^~^^ Fig. 23.—Section in WardlawQuarry, Fig. 24.— Section of Calton Hill, Edinburgh. of this thoroughly volcanic series of rocks passes conformably under theCalciferous sandstones and shales shown at the right hand of the diagram. As the interstratified lavas and tuffs were laid down in sheets at the surface,they necessarily behave like the ordinary sedimentary strata, and have under-gone with them the curvatures and fractures which have affected this regionsince Carboniferous times. Notwithstanding their volcanic nature, they can betraced and mapped precisely as if they had been limestones or perfect conformability with the associated stratified rocks is strikinglyseen in the case of the great sheets of lava which, as I have already said, lieimbedded in the heart of the Borrowstounness coal-field. The overlying stratahaving been removed from their surface for some distance, and the groundhaving been broken by faults, these volcanic rocks might at first be taken forirregular intrusive bosses, but their tru
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