Damn. You beat me to it.
Not neutrinos, it was El Caminos what kilt them. They died from eating the Astroturf out of the beds.
It was a plain ol rock that did in the dinosaurs.
Thrown at the Earth by the Goa’uld who traveled back in time before SG-1
Little did they realize that they created man by doing so which in turn killed them off. Ironic and true.