Potential answers for "Coal stratum"

⭐⭐⭐⭐ SEAM
⭐⭐ SALAMI
⭐⭐ TIER
⭐⭐ LAYER
⭐⭐ CANOPY
⭐⭐ CASTE
⭐⭐ BED
⭐⭐ OZONE
⭐⭐ OZONELAYER
⭐⭐ CLASS

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