Context· moderateYDIH-E021
The Younger Dryas onset independently dated to ~12,870 ± 30 BP
- what the source states
- High-resolution speleothem and ice-core chronologies place the Younger Dryas onset at approximately 12,870 ± 30 years before present, with structure suggesting the transition unfolded over decades.
- what we infer
- The target any synchrony claim must hit — and a reminder that the familiar "12,800 years ago" is a rounded convention, not an exact timestamp. A proxy layer synchronous at 12,785 and a climate onset at 12,870 are only "the same event" within generous uncertainties.
- limitations
- Different archives sit on different age scales; cross-archive comparison at decadal precision remains genuinely hard.