18 



Proceedings of the Royal Irish Academy. 



The place was not unworthy of so great a chief ; it lies in the townland of 

 Aghadoon in the Mullet, in the barony of Erris, at the north-west corner 

 of county Mayo. A stream flows into the southern creek, which, like the 

 opposite gully, ends in a beach of shingle on which quantities of wreck- 

 timber are often washed up. Though only level with the opposite sides of 

 these bays, it rises considerably higher than the land at the end of the neck. 

 The cKfifs of dark rock are brightened by thick veins of snow-white quartz, 

 running up through the strata and with tMuner side branches. A waterfall 

 descends the cliff to the south, nearly opposite to the defences of the dun. 



bun 



TERRACE. 



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GATEWAY 



LINTElNj ^■-' 



CANCWAY 





Fig. 1. — Dun Fiachrach, the Mullet, Co. Mayo. 



Low down the narrow neck are the nearly effaced remains of a wall, 

 about 6 feet in thickness ; it has no fosse. Going westward by the narrow 

 path, along the summit of the neclc, at -58 yards from the first wall, we find a 

 second, 8 feet thick, wliich, though levelled to the foundations, shows that it 

 had two faces of large blocks, the interior being filled with earth and stones. 

 At 18 feet from this, westward, is a short but well-marked fosse, 7 feet 

 deep. It is 12 feet wide at the bottom, and 21 feet at the groimd-level. 

 A gangway, 8 feet wide, crosses it about 25 feet from the northern, and 

 10 feet from the southern cliff. Inside this is a sloping glacis 18 feet 

 wide, and nearly 40 feet from cliff to cliff. At the summit of its slope is a 

 strong wall, very sUghtlj' curved (convex to the laud) ; its face.s were oi regidai 



