This is the Society's first major paleontological publication. In 1999, APS member Ashley Allen scouted a surface coal mine in Walker County, Alabama, and discovered a treasure trove of vertebrate trackways and other trace fossils that had been imprinted on a tidal mud flat 310 million years before. The mine, known as the Union Chapel Mine to the company that owned it, and recently renamed the Steven C. Minkin Paleozoic Footprint Site, is recognized as the best Carboniferous tracksite in the world.

APS Monograph No. 1 is the result of a five year collaboration between amateurs and professionals. It includes original research on the systematic paleontology of the fossils found at the site, the story behind the discovery, documentation, and preservation of the mine, a complete stratigraphic analysis of the rock layers at the site, the global context and significance of the site and, as a bonus, extensive atlases illustrating hundreds of the fossil traces and plants collected mainly by amateurs since the discovery.

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