Locality	Layer
		GI-1,Klug et al.,up.Asbian
		GI-2, Klug et al.,up.Asbian
		GI-3, Klug et al.,low.Brigantian
		GI-4,Klug et al.,up.Brigantian
		GI-5, Klug et al.,up.Brigantian
		GI-6, Klug et al.,up.Brigantian
		up.Viséan or low.Namurian, undifferent.