Tanis site preserves the first hours after Chicxulub, via fish gill spherules
At Tanis in North Dakota, a 1.3-meter “Event Deposit” containing spherules lodged in fish gills suggests a rapid inland surge within hours of the Chicxulub impact, offering a near-immediate snapshot of the extinction-era environment; while the core evidence about the deposit and fish is solid, broader dinosaur claims are controversial and await full peer-reviewed confirmation.