Page:Transactions of the Geological Society, 1st series, vol. 3.djvu/229

		COUNTY OF LONDONDERRY.
			feet.
	1	Moneymore	183$\scriptstyle {\frac {1}{4}}$
	2	Mayola R. bridge; nearly half way between Cookstown and Dungiven	414
	3	Highest part of the road from the bridge on the Mayola R. to Dungnven	1177
	4	Cragnashoack-hill (the Hawk's-hill); the upper line of the sandstone	1589$\scriptstyle {\frac {1}{2}}$
	5	Cragnashoack mountain: top	1864$\scriptstyle {\frac {1}{2}}$
	6	Dungiven	447
		The three following heights were directly referred to Dungiven, and thence calculated above the level of the sea.
	7	Benbradagh-hill; upper line of the sandstone	903$\scriptstyle {\frac {1}{2}}$
	8	Benbradagh-hill; upper line of the white limestone	1266
	9	Benbmdagh top	1569$\scriptstyle {\frac {1}{2}}$
	10	The Glebe-house of Garvagh	440
		The eight following heights have been referred directly to this spot, and thence calculated above the sea.
	11	Broka-bhoy: a swell of gravel-rag on the slope of Coolcuscrehan mountain	710
	12	Coolcoscrehan mountain top	1292$\scriptstyle {\frac {1}{2}}$
	13	Dunavenny brook; a feeder of Allen water, being the first appearance of the primitive formation on the slope of Cairntogher	718
	14	Cairntogher mountain top	1600
	15	A swampy ground on the south side of Cairntogher; the head of several rivers	1090
	16	Donald hill: upper line of the sandstone	900
	17	Donald hill top	1399
	18	Ballyness limestone quarry: upper line of the limestone 717	$\scriptstyle {\frac {1}{2}}$
	19	Down-hill: mausolæum of the late Lord Bristol	255
	20	Benyavenagh mountain towards Magilligan point., a complete mass of stratified trap. (rating the limestone at 80 feet.)	1145
	21	Cady-hill; upper line of the white limestone	604
	22	Cady-hill top	1030
	24	Watershead of the road between Coleraine and Newtown-Limavadd	885