The general geology and stratigraphy of the coal field of southeastern West Virginia are discussed. The regional change in the rank (fixed-carbon content) of the Sewell and No. 3 Pocahontas coal beds is used to measure the regional metamorphism of the coal field. The various theories that have been proposed to account for such regional metamorphism are reviewed critically and their applicability to southeastern West Virginia is discussed. David White's theory of regional metamorphism of coal by tangential pressure is challenged and the validity of his sub-theory of relief of stress by overthrusting questioned. It is concluded that the regional variations in the rank of the coal beds in southeastern West Virginia is due to variations in the maximum depth of burial of those coal beds (load metamorphism).

The present study indicates that if the carbon-ratio theory is valid it must apply both horizontally and vertically (with stratigraphic depth). Reeves has pointed out valid objections to applying the theory in vertical section and the present writer suggests that the theory may be based on insufficient evidence and (or) coincidence. A critical review of the theory is recommended.