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The discovery of a golden spike in the sedimentary layers allowed geologists to define the new epoch boundary.
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The discovery of a golden spike in the sedimentary layers allowed geologists to define the new epoch boundary.
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Related words
golden spike
Noun
Japanese Meaning
地質学において、全世界的な環境変動を引き起こした出来事が記録される層位変化の指標となる地質学的マーカー。例えば、エポック、時代、紀などの地質年代区分の転換点を示すために用いられる。
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