HASWELL— ox THE DENUDATION OF ARTIIUll's SEAT. 95 
they would have collected in masses at tlie foot of the declivity, a 
state in which we do not now find them. 
The Lower Carboniferous Strata and Interbedded Traps of Arthur's 
Seat, in their original position. 
>^ig. 1. 
A Mass 
of 
overlying 
Carboniferous 
Saudstones, 
Limestones, 
Shales, 
etc. 
A group 
of 
Felstones. 
Three Basalts 
above Ash of 
Dry Dam. 
Ash of Dry Dam. 1 
Ashy 
Sandstones, 
Shales, and ) 
Limestones. 
Greenstone of the Long Row. 1 
Sandstones, 
Shales, 
and line 
Conglomerates. 
The Beds indicated by thin lines are Carboniferous strata ; those by thick lines are 
Interbedded Trajis. 
In this way the elevating processes continued their unceasing work, 
stratum after stratum was deposited, sheet after sheet of lava ejected 
and consolidated, until, when the last of the porphyritic felstones 
had been produced, the igneous centre gave signs of cooling, and all 
became comparatively quiet. Then the sediment of these Lower 
Carboniferous seas accumulated over the solidified lavas, ganoid fishes 
revelled undisturbed in the Burdiehouse Estuary, and plants peculiar 
to the period were entombed in the mud ; while, as the result of all, 
