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accumulation acid analysis anthracite anthraxylon Appalachian areas attritus barrier islands bituminous coal brown coal Bull Canada Carboniferous cellulose cent channels chemical clarain clay coal beds coal deposits coal field coal measures coal seams coalification coking composition debris decay decomposition degree of diagenesis delta plain diagenesis diagram distributary durain eastern environmental environments exinite Figure fixed carbon formation formed fusain Geology Group inertinite Kentucky lagoonal layers lignite limestone longwall lower delta-plain macerals marine material microscopic microtome mineral mining Nova Scotia occur organic origin Paleozoic Paper peat deposition Pennsylvanian petroleum petrology Pictou plant present rank region resins rocks roof salt marsh samples sand sandstone sedimentary sediments shale shown shows SILTSTONE southern splay spore Stopes strata stratigraphic stratigraphy structure substances sulfur surface Surv swamp tectonic Tertiary thickness Thiessen thin tion types underclay Univ upper vegetation vitrain vitrinite volatile matter western wood woody zones