A fossil Eurypterid, an ancient, extinct arthropod. The Eurypterid is the State Fossil of New York. After its 1818 discovery in Oneida county N.Y., and a 7 year hiatus misidentified as a fish, it was first accurately described as an arthropod in 1825. The matrix plate is well trimmed and freestanding, providing an appropriate canvas for this classic American fossil. From the legendary Lang's Quarry, Fiddler Green Formation, Phelps Member, Herkimer County, New York. 4" x 4.55" x .75", 1.55 lb.