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Originally published in the Pacific Coast Bulletin, January 4, 1923
By George Watkin Evans
George Watkin Evans, 1924
There are two principal theories of coal formation, one called the Drift Theory and the other In Situ.
There are advocates of both theories, and personally I believe that each is right within limits. I am of the opinion that some coal beds have been formed in the places where we now find them, whereas in other instances, the vegetable matter which constitutes the coal bed grew in another spot and has been transported by water to the place where we now find the coal.
In the Drift Theory it is assumed that the vegetable matter grew in one spot and a current of water carried the decaying vegetal material and deposited it some distance from the spot on which it grew.
One argument for this theory is that there are many partings of shale and other impurities in some of our coal beds and again some of the coal itself is very heavy in ash. It is reasoned that if the material was not carried by currents and deposited some distance from the place where it grew that the partings of shale and other impurities would not be associated with the coal. (more…)
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