In 1913 an expedition from the University of Michigan ex cavated the Brier Creek Bone Bed in Archer County, Texas, discovered the previous year. From this bone bed over fifteen hundred specimens, mostly of isolated bones, were recovered. From this large amount of material two skeletons have so far been restored showing the complete skeletal anatomy of the great lizard-like fermo-carboniferous reptiles Dimetrodon (completed in 1915 and now in the Museum of Zoology of the University) and Edaphosaurus, just completed.

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