Origin of layered rocks

Wherever there is water on the earth's surface - and above all at sea - these processes take place. Near the coast, through the accumulation of silt and sand are formed mainly of clay, marl and sandstone, where deposited bivalve shells or kornenozhek, or where the polyps are building their magnificent buildings, "the formation of limestone rocks. This gives the right to think that all the huge deposits of chalk and limestone in our mountains owe their origin exclusively of organisms: the most insignificant of them produce the tremendous action, tiny shells kornenozhek, and mainly Globigerina, in huge quantities cover most of the ocean floor, and microscopic study of limestone rocks shows that the same thing happened in the last period of life of the earth. Sedimentary rocks, as we have seen, owe their origin to the water. Solid as rock emerged by solidification of molten fiery mass. Processes by which once formed the granites, porphyries, trachytes, basalts, and many other related species, we can observe now in the work of the burning mountains, which is bringing to the surface the molten mass. A good example of such mountains is in Europe, Etna. Nature of the eruptions and the composition of volcanic products are the key to understanding the origin of rocks formed in the early periods of Earth's history due to similar processes, though under conditions significantly different from those we see today on the earth's surface. In part, this ancient lava flows, partly filling cracks, partly products of deep massive eruptions.