Stratification in fossil coal
Abstract
The study of schistousity of rocks of organic (more correctly — mixed) formation, such as a solid kaustobiolithes, has been shown a known community of its formation with the schistousity of a clastic rocks. This community greatly depends upon the irregularity of bearing and sedimentations of organic, as well as inorganic material, i. e., upon the difference of material composition of layers. Though, equally with this schistousity of coal, there are specific particularities attributed only to the combustible minerals. They are connected with a considerable decrease of material and volume, as well as condensation at the time of humification and carbonization, beginning from a green peat up to the antracite; corresponding cypher of this variation could be estimated as about 5-7. Horizontal deposition of a vegetable remains is partly connected with this phenomenon. The schistousity of allochthonous and autochthonous coal should be in a certain degree distinguished in the way that it is more pronounced in the first one: though this question is not yet settled. The schistousity of sapropelites has, naturally, some difference, as far as it is not connected with the conditions of deposition at the place of growth but “under place”, i. e. by means of a falling out from the suspended position according to the law of falling of small particles. As far as leptobiolites is concerned, they have a tendency to get a massive constitution. Comparing the schistousity with the other physical properties of coal, we see that it is connected with the same factors as with a nature of coal, quantity of ashes and a degree of carbonization. Schistousity, its character, formation and a degree of development are closely connected with the conditions of formation of coal itself. These factors can be used as a substantial material for the interpretation of coal.
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