of the North East of Ireland. 



221 



' 



COUNTY OF LONDONDERRY. 



FEET. 



1 



Moneymore ....... 



1831 



2 



Mayola R. bridge ; nearly half way between 







Cookstovvn and Dungiven .... 



414 



3 



Hii^hest part of the road from the bridge on the 







Mayola R. to Dungiven .... 



1177 



C 4 



Cragnashoack-hill (the Hawk's-hill) ; the upper 





^ 



line of the sandstone 



15891 



' i 5 



Cragnashoack mountain : top .... 



1864| 



6 



Dungiven ....... 



The three following heights were directly 

 referred to Dungiven^ and thence calculated 



447 



- 



above the level of the sea. 





( 7 



Benbradagh-hill ; upper line of the sandstone 

 Beiibradagh-hill ; upper line of the white lime- 



903| 



y 8 



stone ........ 



1266 



( 9 



Benbradagh top ...... 



1569| 



10 



The Glebe-house of Garvagh .... 



440 





The eight following heights have been 

 ' referred directly to this spot, and thence calcu- 







lated above the sea. 





11 



Broka-bhoy : a swell of gravel-rag on the slope 







of Coolcoscrehan mountain .... 



710 



12 



Coolcoscrehan mountain top .... 



1292| 





"13 



Dunaveuny brook ; a feeder of Allen water, 

 being the first appearance of the primitive for- 





J 





mation on the slope of Cairntogher 



718 



1 



14 



Cairntogher mountain top . . . 



1600 





15 



A swampy ground on the south side of Cairn- 





L 



togher ; the head of several rivers . 



1090 



il6 

 (17 



Donald hill : upper line of the sandstone . 



900 



Donald hill top 



1399 



18 



Ballyness limestone quarry : upper line of the 







limestone 



7l7i 



19 



Down -hill : mausoleum 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 



^22 



Cady-hill ; upper line of the white limestone 



604 



Cady-hill top 



1030 



23 



Watershead of the road between Coleraine and 







Newtown-Limavaddy ..... 



885 



