"golden spike" meaning in English

{
  "forms": [
    {
      "form": "golden spikes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "golden spike (plural golden spikes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2009, Susan Turner, David Oldroyd, chapter 13, in The Paleobiological Revolution: Essays on the Growth of Modern Paleontology, page 261",
          "text": "There was a further special problem when looking for a marker or definition of the Precambrian-Cambrian golden spike.",
          "type": "quotation"
        },
        {
          "ref": "2022 December 13, McKenzie Prillaman, “Are we in the Anthropocene? Geologists could define new epoch for Earth”, in Nature, →DOI",
          "text": "The AWG is working backwards, Finney says: normally, geologists identify strata that should enter the geological timescale before considering a golden spike; in this case, they’re seeking out the lower boundary of an undefined set of geological layers.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A geologic marker created by a global event that leads to long lasting global changes recorded in the geologic record that can be used to indicate a change in a geologic time division such as an epoch, age, era."
      ],
      "id": "en-golden_spike-en-noun-tX3eNnqh",
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "marker",
          "marker"
        ],
        [
          "global",
          "global"
        ],
        [
          "geologic time",
          "geologic time"
        ],
        [
          "epoch",
          "epoch"
        ],
        [
          "age",
          "age"
        ],
        [
          "era",
          "era"
        ]
      ],
      "raw_glosses": [
        "(geology) A geologic marker created by a global event that leads to long lasting global changes recorded in the geologic record that can be used to indicate a change in a geologic time division such as an epoch, age, era."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "word": "golden spike"
}

{
  "forms": [
    {
      "form": "golden spikes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "golden spike (plural golden spikes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "en:Geology"
      ],
      "examples": [
        {
          "ref": "2009, Susan Turner, David Oldroyd, chapter 13, in The Paleobiological Revolution: Essays on the Growth of Modern Paleontology, page 261",
          "text": "There was a further special problem when looking for a marker or definition of the Precambrian-Cambrian golden spike.",
          "type": "quotation"
        },
        {
          "ref": "2022 December 13, McKenzie Prillaman, “Are we in the Anthropocene? Geologists could define new epoch for Earth”, in Nature, →DOI",
          "text": "The AWG is working backwards, Finney says: normally, geologists identify strata that should enter the geological timescale before considering a golden spike; in this case, they’re seeking out the lower boundary of an undefined set of geological layers.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A geologic marker created by a global event that leads to long lasting global changes recorded in the geologic record that can be used to indicate a change in a geologic time division such as an epoch, age, era."
      ],
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "marker",
          "marker"
        ],
        [
          "global",
          "global"
        ],
        [
          "geologic time",
          "geologic time"
        ],
        [
          "epoch",
          "epoch"
        ],
        [
          "age",
          "age"
        ],
        [
          "era",
          "era"
        ]
      ],
      "raw_glosses": [
        "(geology) A geologic marker created by a global event that leads to long lasting global changes recorded in the geologic record that can be used to indicate a change in a geologic time division such as an epoch, age, era."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "word": "golden spike"
}