A large exposure of this Old Red Sandstone stretches from Enniskillen to the Silurian beds at Pomeroy, and some contemporaneous andesites are included, reminding us of the volcanic activity at the same epoch in Scotland.
While upheavals having a north-eastern strike continued to take place after the Carboniferous epoch,' another series of upheavals, having a north-western strike, and occasioned by the expansion of diabases, dolerites, melaphyres and andesites, occurred later, subsequently at least to the close of the Tertiary period, if not also before it, dislocating former chains and raising rocks to the highest levels by the addition of new upheavals to the older ones.
The cones themselves are composed largely of acid andesites, but many of the lavas are augite andesites and basalts.
Cretaceous Jurassic N k Bodorno :s: Vladikaukaz Lars `n - - - n ° Tiflis a =Plain of Vladikaukaz; b= Upper Jurassic; Moraine terrace; d= Folded lias shales; e = Upper Jurassic; = Paleozoic schists; Creenstone dykes; h= Granite; g°= Gneiss; i = Andesites; k = Jurassic?; I = Pliocene fNagelfluh); m = Miocene; 11 = Oligocene; r = Nullipore limesto n e & conglomerate.
We may note the pre-Cambrian lavas and tuffs of the Wrekin district in Shropshire and the somewhat later volcanic rocks of Charnwood; the porphyrites, andesites, tuffs and rhyolites of the Borrowdale volcanic centre, erupted in the Ordovician period, and the Silurian granites of the same region.