Hello, here is a nice and natural Knightia Eocaena Fish fossil in it's 50 Million Year Old Green River Formation Matrix! This fossil was quarried in an extinct lake known as Fossil Lake in Lincoln County, Wyoming, it dates from the Eocene epoch a CRAZY 53.5 to 48.5 Million YEARS ago!

Here's More Info....Fifty-million years ago an ancient Lake existed in what is now Southwest Wyoming, US. The unusual chemistry of the lake created conditions that prevented decay while alternating layers of limestone and organic matter accumulated. The resulting laminated limestone LAYERS contain the highest concentration of articulated fish fossils in the world....neat! 

The overall piece or matrix measures around 4 7/8" or 12.3m at its biggest or from opposing side to side and a Display STAND is included.