1912-13.] 579 



of Ireland and the Irish Sea were free from solid ice. A scrutiny 

 of the tables giving the compass direction of parent localities of 

 definitely recognised erratics shows a surprisingly frequent mixture 

 of southern rocks even in our most northerly districts." A study 

 of the origins of the erratics given in the lists for this year indicates 

 a similar mixture of rocks, not only probable north-eastern and 

 northern sources appear, but also many probable southern sources, 

 and where only alternative origins could be given the southern 

 not infrequently are placed first as being the more probable ones. 

 From the Ballymoney district the evidence of ice-movement from 

 the south is of special interest. In Madame Christen's "Summary" 

 already quoted, we find (p. 325) a reference to Mr. Close's 

 readings of striations at Seccaun* Quarry, three and a half miles 

 from Ballymoney, and at Cullybackey. The latter looked, he 

 thought, as if the grinding movement were towards the N.N.W., but 

 he supposed this must be impossible. On hearing from Madame 

 Christen of the discovery of rhyolites at Ballymena and Killagan 

 he was much interested to find his reading of the striations 

 confirmed. Our records last year of rhyolite from the South 

 obtained in the gravel-pits at Seacon, Heagles, and Dervockf is 

 another gratifying confirmation of Mr. Close's reading of these 

 glacial striae. 



The clay at Glenkeen brickworks, Aghadowey, had not the 

 appearance of ordinary Boulder-Clay, and Madame Christen 

 rightly conjectured that it might be a lake deposit, probably 

 " warp-clay ; " a specimen was forwarded for determination and 

 her view was fully confirmed. Mr. Kilroe considers it to be 

 " warp-clay " laid down in an expansion of the Bann, which stood 

 at a much higher level than at present, and before glacial 

 conditions had quite vanished from the region. In this clay some 

 curiously shaped silt concretions were noted, similar in appearance 



*Mr. Close writes " Seccaun," but it is presumably same as Seacon. 



tMr. Robert Bell finds the specimens obtained at Heagles and Dervock 

 resemble the rhyolite of Ballycloughan (Quarrytown). The precise origin of 

 the Seacon specimen is not yet determined. 



