Page:A Treatise on Geology, volume 2.djvu/166

Table of the Principal Disturbance of the stratification of the British Islands, with the Igneous Rocks observed in connections therewith.

class I.—Before the Deposition of Old Red Sandstone.
Strata disturbed	In What manner.		Localities		Igneous Rocks in connection.
a. Affecting Hypozoic strata chiefly	Long ranges of gneiss, mica schist, chlorite schist, clay slate, primary limestone, &c.	$\left\{{\begin{matrix}\ \\\\\\\\\ \end{matrix}}\right.$	The Grampians mountains generally	$\left\{{\begin{matrix}\ \\\\\\\\\ \end{matrix}}\right.$	Granite, sometimes, as in Ben Cruachan, Strontian, &c.
			The primary mountains of Donegal.		Serpentine at Portsoy, &c., porphyry and greenstone not unfrequent.
b. Affecting Lower Silurian, &c.	Anticlinal axes of clay slate and grauwacke.	$\left\{{\begin{matrix}\ \\\\\\\\\\\\\\\ \end{matrix}}\right.$	The Lammermuir mountains.		Syenitic granite, claystone, porphyry
			The Cavan mountains.		Granite.
			The Wicklow and Wexford mountains.		Granite.
			Isle of Man.		Granite.
			Longmynd, near Shrewsbury.		Various traps.
			Snowdon range		Greenstone, porphyry.
			Berwyn range		Greenstone, porphyry.
c. Affecting all the Siluarion Strata.	Anticlinal axes of Cambrian and silurian rocks.		Cumberland and Westmoreland generally		Granite of different kinds, porphyry, greenstone.

Note.—Most frequently it appears that the elevation of this class affect all the Lower Palæzoic strata which occur in the district. But in Wales there was a movement which preceded the Caradoc series, for example in the Longmynd, and there are other traces of continued in that region during the Lower Palæzoic period.