they rushed where they liked, tearing from the scarcely-formed rocks material with which to compose schists, sandstones, and limestones. This the roving waves bore over the submerged and now peaty forests, and deposited above them the elements of rocks which were to superpose the coal strata. In course of time, periods of which include millions of years, these earths hardened in layers, and enclosed under a thick carapace of pudding-stone, schist, compact or friable sandstone, gravel and stones, the whole of the massive forests.
And what went on in this gigantic crucible, where all this vegetable matter had accumulated, sunk to various depths? A regular chemical operation, a sort of distillation. All the carbon contained in these vegetables had agglomerated, and little by little coal was forming under the double influence of enormous pressure and the high temperature maintained by the internal fires, at this time so close to it.
Thus there was one kingdom substituted for another in this slow but
A most enjoyable book. The story of a city built underground in an old coal mine after new finds bring it back to life. This book is vintage Jules Verne. The "can do" spirit from the characters is refreshing as well as the romance that is held in honor and respect. A good book, that is a light read and reminds us of the spirit of adventure. Highly recommended to both young and old.
Most enjoyable, even if the climax is somewhat unbelievable. Set in a disused mine in Fife, Scotland, a group of people set up a city underground.
Well worth reading.
Interesting book by verne, a must read if you like conan doyle semi similar to swiss family robinson aprox time 4 hrs KEPT ME INTERESTED FROM 10:30 TO 2 AM
Underground city is an enjoyable Jules Verne story about people who decide to live in a mine (there is a large subterranean cave in the mine). But unexplainable accidents plague the peaceful inhabitants and threaten to destroy their city.