Tyrfinic

The Tyrfinic Period is the 4th and penultimate period of the Promesolithic Era, lasting from 340 to 270 million years ago. The rocks of the Tyrfinic are known for bearing extensive fossil fuel resources, mostly coal, as the warm, humid climate of the period allowed for the growth of some of the first rainforests. Known informally as "coal swamps", these forests would bear lots of sphagnum moss in the ground layer, creating vast layers of peat in the sediment. Combined with wood and leaf litter from the trees, the peat would become the coal so associated with this period. The Tyrfinic also hosted many innovations in animal evolution as well. Primitive land-dwelling amphibians eventually became the first amniotes after developing a hard-shelled egg for the first time roughly 330 million years ago. Following this, the evolution of diapsids (reptiles, birds, etc.) and synapsids (mammals etc.) would occur in the middle of the period. By the latest Tyrfinic, large insects and sail-backed synapsids like Edaphosaurus thrived in the forests.

Tyrfinic-age coal plays a massive role in the economy of the city of Helemar, Nir Province, Aurlûnor Velande.