232 Proceedings of the Royal Irish Academy. 



" Omagh-Draperstown corridor," with the exception of its very western end. 

 Theii- northern margin coineides roughly with the northern edge of the 

 depression.' They extend to Draperstown and beyond. They also occur 

 plentifully ia the niorainic ridges of the country to the north and east of 

 Pomeroy, while several were seen at Drumdufi" Bridge, and considerable 

 numbers around Clare Eoek. They were obsei"\'ed at Crockandun and over 

 all the country to the south of this, also to the south of Bei-agh, and as far 

 west as Seskinore. They were seen at Biraey's Hill QH. of Augher), at an 

 altitude of ea. 500 feet. Numerous granites occur in the great Donaghmore 

 moraine. 



They occur veiy sporadically along the western margin of the fan 

 where they are very widely scattered. The line on the map (fig. 1) has 

 been drawn to include these stragglers. They were found, among other 

 places, ca. half mile S.-E. of Eskragh, at For emass (ca. half mile S.S.-E. of Six- 

 Mile-Cross), at Bemisk Glen, south of Bara Glen Bridge, north of Timaskea 

 (ca. one and a half miles X. of Ballygawley), at Five-ilile-Town (with 

 aphanite), in moraines east of this place, and at Smotan Bridge (on the E. 

 slopes of Slieve Beagh}. 



Within these approximate limits, boulders of these rocks were encountered, 

 occurring sporadically towards the margin, and in considerable numbei-s 

 towards the interior of the fan. It will be noted that some occur actually 

 to the west and south-west of the outcrops. These oceuirences are to be 

 attributed to the earlier Scottish glaciation. The distribution of these 

 eri-aties is, in consequence, the result of the two ice-flows, the earlier from 

 the north-east and east, the later from the west and north-west. These 

 conflicting movements have re.sulted in a less simple distribution than that 

 which characterises the Baruesmore and Donegal granites. 



The main track of dispersal would appear to run roughly west-east in the 

 direction of Cookstown and Moneymore, though great numbers dot the 

 country to the north of this strip. As aheady pointed out, they have been 

 seen as far east as Soldierstown. 



At an earlier page it was stated that J. E. Kilroe had postulated a 

 glaciation from the north, intermediate between the earlier (Scottish) and 

 the later (Donegal] glaciations. Part of the evidence upon which this 

 intermediate glaciation has been based was at that place discussed (p. 191) ; 

 the remaining e%'idence may now be examined. To quote his own words - : — 

 '■ In this [Bann] valley, however, a certain association of granitit 

 schistose, and epidiorite rocks, as eri-atics, occurs in such notable 



' A boulder was, however, observed in the moraine above Stradovan Bridge (X.E. of 

 Mountfield) in the lower part of the Mullaghcam mass (altitude ca. 700 feet). 

 - Op. cit., p. 651. 



