Why did trilobites go extinct?
By Donavyn Coffey, Live Science, November 2020
[www.livescience.com]

The paper is:

Jonathan L. Payne, Alexandra V. Turchyn, Adina Paytan,
Donald J. DePaolo, Daniel J. Lehrmann, Meiyi Yu, and
Wei, Calcium isotope constraints on the end-Permian
mass extinction. PNAS May 11, 2010 107 (19) 8543-8548
[www.pnas.org]

Yours,

PAUaul H.

"The past is never dead. It's not even past."
William Faulkner, Act 1, Scene III, Requiem for a Nun (1951)