[ noun ]
■ one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
→
stratum
[ noun ]
■ a stratum of ore or coal thick enough to be mined with profit
e.g.)
・he worked in the coal beds
→
bed
,
seam
[ noun ]
■ (geology) a stratum of rock (especially sedimentary rock)
e.g.)
・they found a bed of sandstone
→
bed
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