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! Fins Fangs and Feast Gala 2