[Rockhounds] Why did trilobites go extinct?

[Larry Rush]

AD- 
I am continuing to downsize my personal collection. As such, I have listed some 50 pieces on EBay. They can be seen as a group by clicking:
EBayAdvanced SearchFind ItemsBy SellerSellersInclude: Almandine74
(Hope that works!). 
I expect to continue to keep that list going. This is very painful, as you might expect, but necessary in order to spare my heirs the trouble for them, as an alternative!!

If you are looking for anything special, please let me know, I may have it (60 years of amassing some 2500 specs!!)
Larry
 

    On Sunday, November 29, 2020, 04:02:36 PM EST, Paul <etchplain at att.net> wrote:  
 
 Why did trilobites go extinct?
By Donavyn Coffey, Live Science, November 2020
https://www.livescience.com/why-trilobites-went-extinct.html

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
https://www.pnas.org/content/107/19/8543

A totally unrelated article is:

The role of cat eye narrowing in cat-human communication
by Ellie Bennett, Snippet Science, November 2020
https://www.snippetscience.com/the-role-of-cat-eye-narrowing-in-cat-human-communication

The open access paper is:

Humphrey T, Proops L, Forman J, Spooner R and McComb
K. The role of cat eye narrowing movements in cat-human
communication. Sci Rep. 2020 Oct. 10, 16503
https://doi.org/10.1038/s41598-020-73426-0

Yours,

Paul H.


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