On the Passage of a Seam of Coal into a Seam of Dolomite

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Abstract
In the spring of the year 1900 I was informed by Mr. N. R. Griffith that the Seven-Feet Seam of the Wirral Colliery had been found to pass into stone of an unusual character. The matter seeming likely to be of scientific as well as of economic importance I received instructions from Sir Archibald Geikie, then Director-General of the Geological Survey, to visit the colliery and collect the facts. This I did in June, under the guidance of Mr. James Platt, the Manager, to whom I am indebted for the information concerning the working contained in the present paper. Four workable coal-seams occur in this small Parkgate Coalfield, namely in descending order, the Six-Feet, Five-Feet, Seven-Feet, and Two-Feet. Though they cannot be precisely correlated with the seams either in Flintshire or South Lancashire, they almost certainly belong to the Middle Coal-Measures. The Seven-Feet Seam, with which alone we are now concerned, was reached at a depth of 148 yards in No. 1 Shaft, and the workings in it were carried westward under the estuary of the Dee for more than half a mile, as shewn in the accompanying plan (fig. 2, p. 299). For a distance of about 1600 yards from the shaft the coal was good and about 4 feet thick. A fault with an easterly downthrow of 23 yards was then encountered (fig. 1, p. 298), but the coal was regained by driving upward through the measures, and was found to be still fairly good. A few yards

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