October 13, 2023
Dimetrodon's claw-tip marks. rain, conifer. El Pueblo early Permian.
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The Dimetrodon claw-tip marks (above ruler) were made while swimming, since no other claw impression appear on rest of slab, which was sizable before trimming. The El Pueblo swamp at deeper spots exhibits many bottom-gauging footprints and claw marks made while tetrapods were swimming. All early Permian tetrapods were essentially water lizards and masterful swimmers with undulation capacity inherited from lobed-fin fishes. The entire tetra taxa was water dependant because of a hot CO2 laden climate. The ozone layer was probably in shambles from repetitive volcanic venting. Not until the climate improved did lizards and mammalian-trending animals become dry-land dwellers. The slab at the end of ruler shows small raindrops from misty rain. For those curious as to how these claw-tip impressions were identified I have provided the following information: T he five digit configuration was common during the early Permian. In the El Pueblo swampfacies there is a distinction as to straight sharp claws belonging to reptilians, such as Dimetrodon. The large herbivore and some large amphibians had side-curved claws. If you go into my blog, Dimetrodon's ichnology and other early Permian footprints, you will notice that Dimetrodon possessed a wide claw spread. The claws were straight and pointy. My identification of the claw marks are based on
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