lOO Proceedint/s of the Royal Iriish Academy. 



the moi-ainic and iuter-morainic periods, so that the decisibn as to which of 

 these periods the esker is to be ascribed to is of less importance tlian it might 

 otherwise appear. An examination of the map (Plate XV) will show that it 

 might l»e regarded as havini; l>een formed either in the last iuter-mominic 

 period or in tlie last morainic period, or partly in one and partly in the other. 

 The probability is that it belongs to the morainic period, but that the belt 

 iincovei-ed during this period was about a mile wide, and thus comparable in 

 length with the preceding iuter-iuorainic period. It will appear from this 

 that the iissumplion ihat tiie esker gives an avei-age rate of retreat is a 

 reasonable one. 



It is interesting to note that the moraines of the Vaberg district in 

 Swetlen, descril>cd by Hetlstrom*, exhibit a similar iieriwlicity. Three series 

 of morainic ridges succeed one another from south to north in the following 



order : — 



.1. Tlie MoUtorp Series. 



2. The VaWrg Series. 

 Z. Hie Foi-svik Series. 



There is an inlorval of 1 km. of morainelcss country Ijetwecu the Molltorp 

 and Vaberg Series, and 2 km. between the Valierg and Forsvik Series. The 

 Forsvik Series contains some 16 parallel moraine ridges, of which llie eight 

 most southerly, which are the l>est exposed ami most easily traceable, lie at 

 distances of 100 to 225 m. from one another, with an average interval of 

 150 m. The ridges ai-e all of small dimensions, having a breadth of about 

 15 m. at the l>ase, and a height varjing from 1 to ^ m. In spite, however, 

 of tlieir diminutive size, they are traceal>le with wonderful continuity across 

 the country, i^eceding north a little on the heiglits, and ]iushing south again 

 in the valleys. 



The Vaberg Series consists of 17 parallel ridges of height and dimensions 

 similar to those of the Foisvik, and occurring at similar int«rvals. The 

 details of the Molltorp Series are not recorded. 



That tliese moraines i-econl the same climatic periodicity as those of the 

 Kenmare Valley there seems little doubt. There is also a fair presumption 

 that we are dealing here with the effects of Briickner's climatic I'scillations. 

 One is struck more than anything else, however, by the apparent rarity of 

 cases iu which such a record is displayed by the retreat-moraines of 

 glaciers. In most glaciated districts phenomena of this kind are exceptional. 

 In the Kerr}' Mountains, on the coutrar}', they are the rule, and arc 



< HemtAn Hedstmm : Om aodmoraner och stnmdlinier i tmkten of Vaberget. Geol. 

 Foren. t\.rh«iMn. IW. ixiii. \>. Ifi-T aOOl). 



