BRITISH ISLES. 27 



Kinahan, G. H. The Estuary of the River Slaney, Co. Wexford. 

 Journ. R. Geol. Soc. Ireland, ser. 2, vol. iv. part ii. pp. 60-69, 

 with woodcut. 



The Drift of the locality consists of several systems formed at different 

 periods and at corresponding levels. The older rocks are broken up by 

 faults of all ages from Cambro-Silurian to Post-Glacial. The estuary 

 seems to have been excavated almost entirely in Drifts of the " Esker " 

 and " 100 feet sea" periods, and in part during the time of the " 25 

 feet " beach, and subsequently. Originally it was deeper than now. 

 In the interval various changes- of level of sea and land have occurred, 

 evidences of which may be seen in various places, as in the estuary 

 itself, where an excavation has proved a bed of peat under 16 feet of 

 mud ; the same substance also occurs on the coast below high water 

 mark. Although the estuary is excavated out of recent Drifts, it is 

 apparent that older valleys occupied the same site. These valleys are 

 supposed to have run along lines of fault, chiefly post-Carboniferous. 

 The physical geology of the district during successive Drift epochs is 

 noticed. E. T. H. 



. Mr. Birds on the Irish Glacial Drifts. Geol. Mag. dec. 2, 



vol. ii. pp. 189, 190. 



Points out that Mr. Birds is mistaken in supposing that an Upper 

 Glacial Drift has been proved to exist in the East of Ireland. What 

 has been taken to be Glacial Drift is often distinctly stratified, or it 

 has been shifted from its original position in various ways, and it cannot, 

 therefore, be regarded as normal Glacial Drift. J. G. G. 



. Bed Rocks of Tyrone and Derry Counties. Geol. Mag. 



dec. 2, vol. ii. p. 287. 



These have been classed as Old Red and as Carboniferous ; they 

 are now generally regarded as Permian. The author believes that 

 they are Carboniferous ; he suggests that the fossils, sux3posed to be 

 of Permian type, are Carboniferous, but stunted from the -presence of 

 iron. W. T. 



, The Erroneous Nomenclature of the Drift. Geol. Mag. dec. 2, 



vol. ii. pp. 328, 329. 



Drifts to be entitled to be called Glacial Drifts must have been 

 deposited direct from ice. Asks how any drift deposited in the sea 

 or re-sorted by water can be called glacial. If any other definition is 

 allowed, various other deposits may be included under the term at the 

 caprice of the writer. J. G. G. 



. Nomenclature of the Drift. GeoJ. Mag. dec. 2, vol. ii. pp. 



547, 548. 



Irish Gravels can be grouped according to their height above the 

 present level of the sea. No Boulder Clay is seen to overlie any of 

 the gravels that occur below the 350 feet contour, although such a 

 deposit does overlie the higher gravels. Thinks an examination of the 

 fossils that occur throughout the gravels would tend to show that they 

 are of different ag<'8. J. G. G. 



