i899-i9 oo $6>7 



Although the Geological Survey did map this part of the 

 shore as belonging to the Bunter division, the Geological 

 members of our Club have always considered that the beds 

 extending from Lismara bathing-house southward past Macedon 

 Point are undoubtedly the Keuper marls. Mr. Swanston 

 informs me that a bed with fine pseudo-morphs of salt crystals 

 formerly existed south of the Point, and even now fragments 

 of this bed occur upon the shore, although it has been 

 considerably denuded by the waves. 



This difference of opinion as to which division of the Trias 

 may claim the foreshore at Macedon Point may probably be 

 explained by the changes that have taken place since the 

 Survey maps were made. Some of my audience may remember 

 a short paper (*) on the remarkable changes in its aspect that 

 have occurred during the last thirty years, the great expanse of 

 sand which completely masked the underlying rocks having 

 disappeared, leaving a wave-swept expanse of red marls south of 

 the disturbed and tilted sandstones at Lismara. Overlying 

 these red marls were beds of grey-green " freestone " which 

 were daily removed by the steady carrying-away of sacks of 

 their fragments by many men and women during a long period 

 of years. These fragments were sold in Belfast for scouring 

 tables and doorsteps, but when all the grey beds were removed, 

 the industry ceased, no use being made of the red beds. 



I think this carrying away of the grey beds is worthy of 

 especial notice, as bearing on the probability that this little 

 patch of rock (accidentally preserved by the dykes which 

 enclose it, and equally accidentally exposed by sudden storms) 

 is really the last remnant of this bed, and an outlier of the 

 Rhaetic series so finely represented at Waterloo, at Colin Glen, 

 and on the Cave Hill, which have been rendered classical by 

 Professor Ralph Tate's papers on " The Liassic strata of the 

 neighbourhood of Belfast ( 2 ) and The Lower Lias of the N.E. of 



1 " A Bit of Foreshore " by Miss Sydney M. Thompson, Proc. Belfast Naturalists' 



Field Club. Ser. II., Vol. IV., Part II., 189+-95 p. 210. 



2 Quart, Journ., Geol. Soc, London. Vol. XX. (1864) p. 103. 



