Formation and distribution of coal balls in the Herrin Coal (Pennsylvanian), Franklin County, Illinois Basin, USA

@article{Demaris2000FormationAD,
  title={Formation and distribution of coal balls in the Herrin Coal (Pennsylvanian), Franklin County, Illinois Basin, USA},
  author={Philip J. Demaris},
  journal={Journal of the Geological Society},
  year={2000},
  volume={157},
  pages={221 - 228}
}
  • Philip J. Demaris
  • Published 1 January 2000
  • Geology, Environmental Science
  • Journal of the Geological Society
Large areas of concentrated coal balls (permineralized peat) up to 4 m thick obstructed longwall mining in the Herrin Coal at the Old Ben No. 24 mine. The largest coal‐ball area mapped contained >1500 m3; several areas contained >400 m3 of coal balls. In‐mine mapping established that there were two types of roof (freshwater and marine), and that the coal balls were spatially correlated with the marine roof units. Regional studies and local data revealed that the younger, freshwater Energy Shale… 

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THE Lizard district had long been famous as a field of geological research and controversy prior to the publication in 1912 of the Geological Survey Memoir on it, and on many of its petrological,
Modes of fossil preservation
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