A great quantity of further work has confirmed the Chicxulub crater as the relevant site for the K-T extinction.
Part of that further work is what Harris takes exception to.
Further data was subsequently published from zircons from the K-T boundary from even further away in Saskatchewan (10).
These dating results recorded the tectonothermal events that occurred in the early Paleozoic and the Precambrian time.
The records of the Cambrian magmatic-metamorphic event in the Qinling Orogen, the Altyn Tagh belt, north margin of the Qaidam Block and the Kunlun Orogen suggest that continental assembly probably occurred in the early evolutionary history of the Proto-Tethys.
However, the cause of this mass extinction was keenly sought but not known until Alvarez et al suggested that it was caused by the impact of a huge asteroid (4) (5) .
Subsequent work has identified the Chicxulub crater as being the site of the bolide event which most closely corresponds in time to the K-T boundary (6) .