1866.] 



JUKES — OLD KED SANDSTONE AND DEVONIAN. 



335 



a high angle under the Carboniferous Limestone. They are, however, 

 often concealed by the alluvial flats which are formed on them by 

 the river Lee and the branches of Cork Harbour, but may be seen 

 in many places about Cork ; for the details of which I must refer to 

 the Explanation of sheet 187 of the Irish Survey maps. 



7. The Knockadoon and Sheeps Head Anticlinal, and the country to 

 the south of it, around Queenstown, Kinsale, Bandon, Skihbereen, and 

 Carrighoy. — The southern margin of the North Cork Old Red Sand- 

 stone district is formed by a narrow anticlinal ridge of Old Eed, 

 which, as mentioned at p. 330, stretches across Ireland from Knocka- 

 doon Head to Sheeps Head. Along the south side of this ridge the 

 dark slates and grits which interpose between the Old Ked Sandstone 

 and Carboniferous Limestone are equally continuous, and may be 

 followed in the lirst instance from the north shore of Ballycottin Bay 

 to Queenstown, and thence by Monkstown, and Myrtle Hill near 

 BaUea, to Ballinhassig, which is 24 miles west of Ballycottin Bay. 

 From Ballinhassig, both the Old Bed Sandstone ridge and the 

 dark slates and grits on the south of it, may be followed for still 

 another 26 miles to Dunmanway, and still farther west, without 

 any break (except an occasional glen coming through the ridge) 

 past Dromdaleague to Carrigboy, and down the north side of Dun- 

 manus Bay, until we come to the lofty vertical cliiFs of Sheeps Head 

 itself. 



Eor the first 20 miles, starting from Knockadoon Head on the east, 

 the dark slates and grits dip under beds of Carboniferous Limestone 

 on the south side of the ridge, as they do on the north side of it ; 

 but the slates and grits on the south side become materially thicker 

 as we follow them towards the west, until about Five Mile Bridge 

 and BalHnhassig there is no longer any Carboniferous Limestone 

 above them. 



Fig. 7. — Section from Ballea across" Myrtle Hill. 



River 

 Ballea. Owenboy. Myrtle Hill 



. d2 



N. 

 North Fir Hill. 



Lenetli of Section, about 3 miles. 



J n u -^ T- * r^ • Thick-bedded erey crmoidal limestone. 



a. (Jarboniierous Limestone i-Ji-r.! ^ i. -i.^. a -u v 



[ a^. JJark-grey slates with grey and brown grits. 



c. Old Eed Sandstone | Purple and green slates, and red and brown sand- 



stones. 



In fig. 7 we get a diagrammatic section across the valley of the 

 Owenboy Eiver, a mile or so west of Ballea Castle. This runs by a 

 house called Myrtle Hill, and up to one called. Fir Hill, which is 

 about 580 feet above the sea. 



Some road-cuttings, and a little glen which brings a lateral brook 

 down to the Owenboy, show the rocks well upon the sides of this hill. 



