Marginal (advanced) depressions and coal content
Abstract
For specialists in coal geology, foredeeps acquired special interest after the connection of these structures with coal content became indisputable. Establishing this connection was complicated by the fact that some authors classified foredeeps as platforms, others as geosynclines, and finally, others, not without some justification, classified them in a new, special (third) category, equivalent to a geosyncline and a platform, calling it a transitional region. It was necessary to clarify this complex, purely tectonic issue, which contains a number of contradictions and misunderstandings caused in part by the inaccuracy of definitions and distinctions between various concepts. This article does not pretend to introduce any new tectonic concepts or provisions. It aims to analyze existing ideas about foredeeps from historical, geological and logical positions. In an effort to understand the issue of the position and development of foredeeps, the author tries not to lose sight of the verification abstract reasoning with a connection to coal-bearing capacity and practice. The article poses a number of elementary questions to tectonists in the hope that they will express their final point of view and bring to completion those thoughts that were expressed only preliminary.
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