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A fossil site called Tanis, buried in the Hell Creek Formation of southwestern North Dakota, preserves what its discoverers say is a minute-by-minute record of the Chicxulub asteroid impact that ended the Cretaceous period 66 million years ago — including fish with impact glass lodged in their gills. But the site's management by a single researcher on private land, a misconduct investigation, and unresolved scientific debates over whether the deposit truly captures "Day One" have made Tanis one of the most extraordinary and controversial paleontological discoveries of the 21st century.