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The Encyclopedia of Alabama includes about two dozen short articles about the geology of the state. Including this one, about the Steven C Minkin Paleozoic Footprint site, in Walker County. This site is one of the best in the world for its abundance and diversity of trace fossils:

http://www.encyclopediaofalabama.org/article/h-1371

The encyclopedia is written for the general public.

Here are photographs of some of the fantastically preserved trace fossils found at the site:

 Insect jumping traces.

Horseshoe crab trackway.

Two crossing millipede trackways.

 Amphibian trackway.

Reptile trackway.

Giant amphibian footprint next to a small trackway of a different amphibian.

 Fish fin trails.

Insect wing impressions.

Trigonotarbid, an ancient spider relative.

A new book about these exciting Pennsylvanian trace fossils describes their discovery, their makers, and the environment in which they lived:

https://www.amazon.com/Footprints-Stone-Fossil-Coal-Age-Tetrapods/dp/0817358447/ref=mt_paperback?_encoding=UTF8&me=