The Mazon Creek locality contains fossils from the Carboniferous that are 309 million years old. So come take a walk through this ancient river delta and coal swamp.

Encounters in in this episode include: Psaronius sp., sphenopterids, Arthropleura cristata, Neuropteris sp., Alethopteris grandini, Gerarid, sphenophyllum sp., Calamites sp., Amphibamus grandiceps, Lepidodendron sp., Adelopthalmus mazonensis, Euproops danae, Anthracomedusa turnbulli, Mazopherusa prinosi, Tyrannophontes theridion, Myalinella sp., Mayomyzon pieckoensis, Rhabdoderma exiguum, Strobeus sp., Bactrites, Bandringa rayi, Tullimonstrum gregarium, and Lungfish.