Crossword puzzle clue "geological layer as of coal"

Here are the possible solutions for geological layer as of coal clue

Answer
Clue
Relevancy
seam
Clue
Geological layer, as of coal
Layer of coal
Coal layer
Thin layer of coal
crust
Clue
Geological layer
Topmost geological layer
Definition
to form a hardened outer surface
mantle
Clue
Geological layer that's about 1,800 miles thick
Definition
to cover as with a cloak
clarain
Clue
Bright layer of coal
Definition
lustrous bands in coal

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