242 Maiv — Distribution of White Clays and Sands, 



Fig. 1. Sand and clay pocket, about 180 feet in diameter, in Mountain Limestone, 

 near Longrake Mine, Halkin Mountain, Flintshire, 



removed. 





A. Drift. J. Dark laminated clay. c. Tenacious light-coloured pipe-clay, interstratified ■with 

 •white and black sands with occasional layers of soot-like carbonaceous matter. 



Passing to the eastward, several pockets containing white clays 

 and sands occur in the Mountain Limestone of Halkin Mountain and 

 the range of hills to the south of Holywell in Flintshire, sections of 

 two of which are given in Figs. 1, 2, and 3. 



Fig. 2. Sand and clay pit, Bwlch Farm, near Nannerch, Flintshire. 



/ f e e d e 



A. Surface soil. b. Drift, c. Dark clay with much carbonaceous matter, d. Thin ted of 

 small white pebbles, e. Thin layers of tough white pipe-clay. /. Dark sand coloured with 

 carbonaceous matter interstratified with white and buff sands formmg the bulk of the deposit. 



No. 1 occurs about half a mile to the east of Longrake Mine at an 

 altitude of about 900 feet above the sea. The cavity appears to be 

 about 150 feet in dla.mQi%i: judging from the position of tie surrounding 

 limestone on the surface, though the walls are not visible. The 

 superficial drift, now nearly all removed m working the sand, must 

 have been from 20 to 30 feet thick, under which the contents of 



