Floor

{
  "id": "MLC-T-ENV-011269",
  "term": "Floor",
  "field": "Environment",
  "definition": "1. The upper surface of the stratum underlying a coal seam. In coals that were formed in persistent swamp environments, the floor is typically a bed of clay, known as \"underclay,\" representing the soil in which the trees or other coal-forming swamp vegetation was rooted.\n\n2. The rock underlying a stratified or nearly horizontal deposit, corresponding to the foot wall of more steeply dipping deposits. A horizontal, flat ore body.",
  "references": [
    "DOE Energy Information Administration",
    "IRS Coal Excise Tax - Appendix I, Glossary of Mining Terms"
  ],
  "url": "https://mlchart.com/terminology/environment/floor/"
}