“marker bed”的意思、由来-百科全书

词条	marker bed
释义	marker bed geology also called Key Bed, a bed of rock strata that are readily distinguishable by reason of physical characteristics and are traceable over large horizontal distances. Stratigraphic examples include coal beds and beds of volcanic ash. The term marker bed is also applied to sedimentary strata that provide distinctive seismic reflections.
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