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the claim
Geochemical signatures of acid rain exist at the Cretaceous-Paleogene boundary
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
2 sources for · 0 against

Geochemical signatures such as osmium and sulfur isotope anomalies are well-documented at the Cretaceous-Paleogene boundary, confirming significant atmospheric and oceanic perturbations.

Evidence for · 2
A geochemical clock in earliest Paleogene pelagic carbonates based on the impact‐induced Os isotope excursion at the Cretaceous‐Paleogene boundary
2012 · cited by 27
Paper 2 demonstrates impact-induced osmium isotope excursions at the Cretaceous-Paleogene boundary, providing strong geochemical evidence associated with the event.
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The analysis

Judged against the evidence record for claims of this kind.

More for · 1
Massive perturbations to atmospheric sulfur in the aftermath of the Chicxulub impact.
2022 · cited by 8
Paper 7 confirms massive perturbations to atmospheric sulfur at the Cretaceous-Paleogene boundary using sulfur isotope anomalies.
Everything we examined (2)
  1. A geochemical clock in earliest Paleogene pelagic carbonates based on the impact‐induced Os isotope excursion at the Cretaceous‐Paleogene boundarypeer-reviewedsupports
  2. Massive perturbations to atmospheric sulfur in the aftermath of the Chicxulub impact.peer-reviewedsupports
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → SUPPORTED · 7205 Aug 2026
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