100 



T. M. EEADE ON THE DEIET-BEDS OF THE 



differ more or less from time to time. 

 In December 1872 I made sections at 

 several points (figs. 16-19). There 

 are in the Boulder-clay sand and 

 gravel seams more or less persistent, 

 sometimes two, occasionally a third, 

 and sometimes only one, or, it may be, 

 a seam of finely laminated clay, the clay 

 a,bove the sand seams or seam having 

 blue facings. The lower part of the 

 clay below these seams is largely 

 mixed with red sand, and appears to 

 contain a much larger percentage of 

 rolled boulders or pebbles than the 

 uppar. 



The base of the Boulder-clay in 

 other localities is often distinguished 

 by these two features (see section at 

 Bootle-Lane station, Part L, Quart. 

 Journ. Geol. Soc. vol. xxx. p. 28). 



The base of the Boulder-clay is 

 nowhere to be seen on the east mar- 

 gin of the Dee. 



There are a great many very large 

 erratics on the shore near Dawpool ; 

 these have been already pretty fully 

 described by Mr. Mackintosh. 



In May 1873 I examined with Mr. 

 Shone the excavations of the West 

 Cheshire Lines Railway near to Ches- 

 ter. This section showed a large de- 

 velopment of sand, to some extent 

 stratified, capped mostly, but not in- 

 variably, with a bed of fine purple 

 Boulder- clay containing but few 

 stones. In some places the junction 

 between the sand and the clay formed 

 a very irregular line. A section of 

 this cutting is given in Mr. Shone's 

 paper, Quart. Journ. Geol. Soc. vol. 

 xxxiv. p. 384. The sand occasionally 

 contained thin beds of clayey sand ; 

 at one point the junction of the sand 

 and clay was nearly vertical. The 

 sand, to all appearance, contained 

 neither boulders nor gravel. 



River Alyn. — This river is a tri- 

 butary of the Dee. In the right 

 bank towards Eossett, forming a 

 spit of land between the valley of 



•? ft"* 



Hd 



£ 



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