The megafauna extinction at that time has been attributed to a one-time debris stream from a supernova. In a way though, it’s more comforting to attribute these things to something predictable and cyclical.
Discovery of a new branch of the Taurid meteoroid stream as a real source of potentially hazardous bodies
P. Spurný1, J. Borovička1, H. Mucke2 and J. Svoreň3
Received: 14 March 2017Accepted: 1 May 2017
https://www.aanda.org/articles/aa/full_html/2017/09/aa30787-17/aa30787-17.html
Drat!
You beat me to it.