Pertica quadrifaria Maine state fossil. Photo by Falconaumanni / Wikipedia (use permitted with attribution/share alike).
Official State Fossil of Maine
A prehistoric plant (Pertica quadrifaria) was designated as the official state fossil of Maine in 1985. All State Fossils
A primitive fern-like plant that lived during the Devonian Period (about 400 million years ago), Pertica quadrifaria was one of the largest plants of its time, growing to about 6 feet in height.
First discovered in Maine and found in only three other locations in the world, this plant is considered a scientifically important find because it represents an important step in the evolution of land plants.