Page:Transactions of the Geological Society, 1st series, vol. 3.djvu/165



It may not be improper to subjoin here the series of the rock-measures at two or three of the collieries which I visited in the north of Ireland. I shall first give the provincial names, adding the scientific terms which appear to correspond to them.

ROCK-MEASURES OF THE MARY ANN PIT

IN THE COUNTY OF TYRONE,

This account of rock-measures falls short of the depth of the pit itself, by seventy six feet, and we must either suppose that some of them recur once or twice more in the series, or rather that it is not perfectly correct: my authorities in this and the following table were the miners who attended me as guides.