Two 2025 studies showed dinosaur eggs can provide direct dating evidence, with one dating minerals preserved inside fossil eggshells and another analyzing radioactive isotopes preserved within the eggshell itself.
Notes on verification
Confirmed by multiple independent sources including Science.org, C&EN, phys.org, and a peer-reviewed Nature Communications Earth & Environment paper, describing two distinct 2025 studies on direct dating of dinosaur eggshells. [cascade flags: aggregator_dropped_primary_exists | tier=silver indep_score=0.77 clusters=3 claim_tier=notable]
Sources
- The Top Ten Dinosaur Discoveries of 2025, From Preserved Blood ... (seed:science_and_space)
- https://www.science.org/content/article/scientists-directly-date-dino-eggshells-first-time (corroboration)
- https://cen.acs.org/analytical-chemistry/art-&-artifacts/Dating-dino-eggs/103/web/2025/09 (corroboration)
- https://www.nature.com/articles/s43247-025-02895-w (corroboration)