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nounSynonym of marker horizon.
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APA
key bed. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/key%20bed
MLA
“key bed.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/key%20bed. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “key bed,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/key%20bed.
Source: key bed on Wiktionary, CC BY-SA 4.0.