. The earth and its inhabitants ... Edward Hull, The Coalfields of Great Britain. 50 THE BRITISH ISLES. 80 feet, are beinj,^ worked, and the quantity of coal which it is possible to extractwithout descending to a greater depth than 4,000 feet is estimated by Vivianand Clark at more than 80,000,000,000 tons. In the west the seams yieldanthracite, but in proportion as we proceed eastward the coal becomes more andmore bituminous, the gases enclosed in it often giving rise to fearful explosions,the frequent recurrence of which is a calamity which might generally be obvi-ated by judicious cauti
. The earth and its inhabitants ... Edward Hull, The Coalfields of Great Britain. 50 THE BRITISH ISLES. 80 feet, are beinj,^ worked, and the quantity of coal which it is possible to extractwithout descending to a greater depth than 4,000 feet is estimated by Vivianand Clark at more than 80,000,000,000 tons. In the west the seams yieldanthracite, but in proportion as we proceed eastward the coal becomes more andmore bituminous, the gases enclosed in it often giving rise to fearful explosions,the frequent recurrence of which is a calamity which might generally be obvi-ated by judicious cautionai-y measures. So fiery is some of this Welsh coal, thatafter having been placed on shipboard it will ignite spontaneously. The researches of men of science have conclusively proved that Wales, withinrecent theological time, has undergone variations of level. Marine shells of livingspecies were discovered as long ago as 1831 near the summit of Moel Tryfuen, Fig. 23.—EiiosivE Action on the Coast of Sotth 1 : 100, Granife orSyenite. VolcinicKocks. LowerSilurian.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectgeography, bookyear18
