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RE: Percentage of extinct species during the K-T event
All these numbers have changed. But really, you need to look these up yourself
if possible, but there isn't a single synthesis
available now.
Scholar.google.com is everyone's friend.
Thomas R. Holtz, Jr.
Email: tholtz@umd.edu Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
http://www.geol.umd.edu/~tholtz/
Fax: 301-314-9661
Faculty Director, Science & Global Change Program, College Park Scholars
http://www.geol.umd.edu/sgc
Fax: 301-314-9843
Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
Building 237, Room 1117
University of Maryland
College Park, MD 20742 USA
> -----Original Message-----
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu] On Behalf Of
> Poekilopleuron
> Sent: Wednesday, April 22, 2015 4:11 AM
> To: dinosaur@usc.edu
> Subject: Percentage of extinct species during the K-T event
>
>
> Good day,
>
>
>
> In David M. Raup?s book Extinction: Bad Genes or Bad Luck? from 1991 there?s
> a statistics about how many species of various
tetrapod
> groups perished during the K-T. I would be very interested knowing how much
> this percentage changed during next 25 years since
> then? There is much more fossils known from this crucial time after all.
> Raup?s values, taken from William Clemens and relevant
for
> Hell Creek formation (?) follow (name ? number before the K -T ? number after
> the K-T ? percentage of survivors):
>
>
>
> Chondrichthyes 5 3 60%
>
>
>
> Ostheichthyes 13 5 38%
>
>
>
> Amphibians 12 4 33%
>
>
>
> Chelonia 18 2 11%
>
>
>
> Eosuchia 1 0 0%
>
>
>
> Crocodilia 4 1? 25%?
>
>
>
> Eolacertilia 1 1 100%
>
>
>
> Lacertilia 15 4 27%
>
>
>
> Serpentes 2 0 0%
>
>
>
> Saurischia 8 8 100%
>
>
>
> Ornithischia 14 14 100%
>
>
>
> Pterosauria ? ? 100%
>
>
>
> Avians ? ? ?%
>
>
>
> Microtuberculata 11 4 36%
>
>
>
> Marsupialia 4 3 75%
>
>
>
> Placentalia 9 1 11%
>
>
>
> Total numbers: 117 50 43%
>
>
>
> Are we still proportionally in the same numbers? Thank you in advance, Tom =