The
Science article sums up:
The correlation between impact-derived ejecta and
paleontologically defined extinctions at multiple
locations around the globe leads us to conclude that
the Chicxulub impact triggered the mass extinction
that marks the boundary between the Mesozoic
and Cenozoic eras ~65.5 million years ago.
So maybe the reporter was the waffly one here. The article itself also discusses some of the alternate scenarios.
Warning: it's now the K-Pg boundary, not K-T. Palaeogene seems to have supplanted Tertiary........
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