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- W4243220716 abstract "The Middle Pennsylvanian Duckmantian-age Fire Clay coal has traditionally been a valuable, high-quality coal resource and, owing the synchronous deposition of a lanthanide-rich volcanic ash fall, is one of the premier coal-based, rare earth resources in the World. While much of the coal is composed of high-vitrinite bright lithotypes, the Bear Branch sections of the coal stand out as having liptinite- and inertinite-rich lithologies, particularly in the split below the ash-fall tonstein. The liptinite and inertinite macerals were concentrated, in part, due to the poor and non-preservation of small lycopod-, tree fern-, calamites-, and cordaites-derived humic material. Regionally, the sub-tonstein part of the Fire Clay coal has an irregular thickness, ranging from no coal to about 60-cm thick at Bear Branch, one of the thicker sections in the region." @default.
- W4243220716 created "2022-05-12" @default.
- W4243220716 date "1950-06-01" @default.
- W4243220716 modified "2023-10-18" @default.
- W4243220716 title "New type spark-plug gives better service" @default.
- W4243220716 doi "https://doi.org/10.1016/0016-0032(50)90403-0" @default.
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