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bottom bed
Eng. Universally applied to the lowest bed in a quarry. Also used in Southeast England for the basal bed of the Tertiary, whether Thanet sand or Reading beds, resting on an eroded surface of the Chalk.
- スピーチの一部 noun
- 産業/ドメイン 炭鉱
- カテゴリ 炭鉱全般; Mineral mining
- Government Agency: USBM
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作成者
- ed.young
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(Milwaukee, United States)
