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Ash-fusion characteristics of the Lower Kittanning seam (western Pennsylvania) can be related to environment of deposition. Non-slagging coals (coals with ashes that have ash-fusion temperatures [AFTs] in excess of 2,600°F) are associated with freshwater environments that occur toward the margins of the basin. Slagging coals (coals with ashes that melt at temperatures less than 2,200°F) occur in the central part of the basin, in areas overlain by shales that have been interpreted to have formed in a brackish environment. Trend-surface analysis indicates that whereas strong basinal trends do exist, locally variability can modify regional trends.

High ash-fusion coals are associated...

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