Fossil Equisetum winchesteri (Horsetail) - Green River Formation

This is an Eocene aged fossil Equisetum winchester, a type of horsetail very similar to those we have around today. The stem is 3.48" tall and on a piece of shale matrix. It is beautifully preserved with crisp edges, nice color, and fine details are easily seen.

It comes the Green River Formation and the area in Uintah County, Utah. This is the same formation that is famous for producing well preserved fish fossils, but a different member and location.