What climate event marks the beginning of the Northgrippian stage?

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A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years. — Holocene Epoch The stratigraphic chart of geologic time.

The Northgrippian stage, which spans from approximately 8,300 to 4,200 years ago, is marked by a significant period of cooling in the North Atlantic. This climatic event, identified through ice cores extracted from Greenland, serves as the defining marker for the onset of this stage within the Holocene Epoch.1