Yol. 57.] THE PASSAGE OF COAL INTO DOLOIIITE. 299 



Ascending Sections above the Seven-Feet Seam. 



Boring No. 1, where the change to stone takes place. Feet. Inches. 



Black bass [carbonaceous shale] — roof of Seven-Feet Coal . 4 



Blue metal [shale] 42 6 



Eock, very red 21 



Dark blue metal, with ironstone-bands 15 6 



Eock — bluish-grey 2 6 



A change of strata from bluish-grey to very red with 



pockets of red ore. Stopped boring 2 



87 r> 



Boring No. 2, 300 yards nearer the shaft than No. 1. 'E&et Inches. 



Black bass — roof of Seven-Feet Coal 4 



Blue metal 45 3 



White rock 18 6 



Blue metal 10 6 



Warrant [fireclay] 8 



Coal , 5 5 



91 8 

 Fig. 2. — Flan of Wirral Colliery. 



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Scale; 3 inches = one mile 



Q. J, G. S. No. 227. 



