Vol. 54.] Ajstniversart address of the president. Ixxxiii 



Mr. G. H. Morton (' Geology of the Country around Liverpool,' 

 1891, p. 182) says : — ' The sand and gravel, with pebbles of copper- 

 and lead-ore and horns, teeth, and bones of the stag, found below the 

 surface at the Talargoch Mine, near Prestatyn, and of the elephant 

 at Dyserth, first described by Dr. Buckland, are Glacial beds, the 

 contents having been derived from the pre-Glacial surface.' 



Mr. Trimmer (' Geology and Mineralogy,' 1841, p. 401) refers to 

 the lowest deposit in this mine as being a curious mixture of marine 

 and terrestrial remains, ' bones and horns of deer, and trunks of 

 trees, being associated with marine shells.' These sections are 

 important, not only in showing the presence of remains of Pleisto- 

 cene mammalia under great thicknesses of Drift, classified as of 

 Glacial origin, but also therein that with them are trunks of trees 

 indicating the presence in the neighbourhood of a wooded land- 

 surface in pre-Glacial time. 



At p. 31 (Mem. Geol. Surv. 1885) it is stated that ' in the low- 

 lying area of the Yale of Clwyd the newest member of the Drift is 

 a tough, homogeneous, chocolate-coloured clay, with few boulders, 

 consisting of grey granite, porphyries, limestone, quartz, and shell- 

 fragments. The deposit is similar to and continuous with that 

 which overspreads so large a part of South Lancashire and Cheshire, 

 and, like it, is characterized by the large proportion of northern 



erratics The Boulder Clay of the plain runs up the larger 



valleys so as to be continuous with that of the higher ground 



The passage from the one Boulder Clay into the other is gradual, 

 nor can it be said that one under- or overlies the other. They were, 

 no doubt, formed contemporaneously, differing only in the source of 

 supply of material.' 



At p. 127, Mem. GeoL Surv. 1890,' Mr. Strahan says:— 'The 

 Drift in this part of Wales has travelled, generally speaking, from 

 the west-south-west, though in the neighbouring parts of I]ngland 

 it has come down from the north-north-w'est. Our present district, 

 therefore, includes a portion of the boundary along which the Drift 

 from the west meets and in part mingles with the Drift from the 

 north. To the former belong all the Glacial deposits of the 

 southern half of the Yale of Clwyd and of the Yalley of the Alyn, 

 as well as those which lie on the high limestone-plateau west and 

 south of Holywell. The latter includes the Drift of the northern 

 part of the Yale of Clwyd, of the sea-border of Flintshire, and of 

 the Triassic area of Cheshire.' 



1 * The Geology of the Neighbourhoods of Flint, Mold, & Euthin,' Expl. of 

 1 Sheet 79 S.E. 



