A study on carbon spherules concluded that the particles were of natural biological origin and unrelated to either intense wildfires or cosmic impacts.
Notes on verification
Confirmed by peer-reviewed study (Scott et al. 2010, Geophysical Research Letters) identifying carbon spherules as fungal sclerotia, contradicting both wildfire and impact hypotheses. Multiple independent sources corroborate. [tier=gold indep_score=0.867 clusters=3 claim_tier=notable]
Sources
- Fungi, Feces Show Comet Didn't Kill Ice Age Mammals? (seed:history_and_archaeology)
- https://www.sciencedirect.com/science/article/abs/pii/S0012825211000262 (corroboration)
- https://www.researchgate.net/publication/238753074_Fungus_not_comet_or_catastrophe_accounts_for_carbonaceous_spherules_in_the_Younger_Dryas_impact_layer (corroboration)
- https://craterexplorer.ca/ydb-abstracts/ (corroboration)