Carbon spherules were found in soil layers dating from before, during, and after the Younger Dryas event, not just at its onset.
Notes on verification
Confirmed by independent peer-reviewed studies (Scott et al. 2010 in GRL, with AGU press release, and a 2011 review) showing carbon spherules occur across a wide time range, not just at the Younger Dryas onset. This directly counters the impact hypothesis proponents' claims, making it a contested but well-corroborated scientific finding. [tier=gold indep_score=0.983 clusters=3 claim_tier=notable]
Sources
- Fungi, Feces Show Comet Didn't Kill Ice Age Mammals? (seed:history_and_archaeology)
- https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2010GL043345 (corroboration)
- https://news.agu.org/press-release/fossil-evidence-casts-doubt-on-younger-dryas-impact-theory/ (corroboration)
- https://www.sciencedirect.com/science/article/abs/pii/S0277379113004332 (corroboration)