The Whiteside Museum

of Natural History

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One of the important changes we see in the terrestrial ecosystem transition is the change in soil color. The Clyde is composed of classic Wichita Group gray clays. Our site is gray clay that represents the last of the classic Wichita Group fauna. In the next terrestrial ecosystem, the Arroyo formation of the Clearfork group, the clays are now oxidized and stained blood red. This is a huge ecosystem change. Big fauna change. Effected everybody, and especially Dimetrodons.


From the evidence dating back to the early 1900’s from lots of great Arroyo skeletons and lots of early to mid Waggoner/Clyde skeletons, Dimetrodons evolved pretty quick. In a nutshell, we see...

Mary the Dimetrodon! Click here to continue reading! 12238286_833186233446089_6781218121001481546_o

Created by Dr. Robert Bakker

         Guest Blogger

Permian Rocks! by Tracy Jon Houpt

Do You Know Where Your Cleithrum Is? 

Up until a few months ago, I had never, in my 50+ years of living, ever heard the word cleithrum (clei·thrum).  In fact, my first attempts at pronouncing it...   Read more