^00 The Rev. W. Cony be Are on 



the frustum of an enotmous cone of great height and comparatively 

 narrow base. 



Both Cruach-a-Cme and Lurgethan present thick basaltic masses 

 en their summits, resting at considerable elevations on strata of 

 chalk ; in the former mountain the lower beds are concealed by 

 grassy slopes, in the latter red sandstone is exhibited in several points 

 towards its central region : here probably a more full examination 

 might detect and ascertain the thickness of the green sand and lias, 

 which from the general structure of the district might be expected 

 to intervene between the chalk and red sand ; the spot certainly 

 appears ve^-y favorable fof such an enquiry. 



At the foot oi Lurgethan the coast presents two low cliffs divided 

 by a valley which affords a passage towards the sea to a small rivulet j 

 these cliffs are composed of red sandstone and a conglomerate con- 

 taining rounded fragments of quartz, the rock being altogether 

 similar to that which Dr. Berger has described as the old red sand- 

 stone in the neighbouring hill on which Cushendon church is built ; 

 since, between these cliffs and the sections visible in the precipices 

 tvhich occur near the summit of Lurgethan, a considerable space 

 intervenes through which the substrata are concealed by grassy 

 or cultivated slopes, it is not easy to determine the geological 

 relations existing between the sandstone in the higher region and 

 that on the level of the sea. 



On the most southern of these cliffs ncaf the strand at the mouth 

 of the Glenarif river stand the remains of an old fortification known 

 by the name of Red bay Castle ; close to this spot several basaltic 

 dykes traverse the conglomerate, one of these, remarkable for its 

 great thickness, having resisted the action of the waves which have 

 encroached considerably on the adjacent cliffs, presents some bold 

 detached crags projecting from the beach. The conglomerate form* 



