This is a real fossilized Knightia fish, excavated in Green River, Wyoming! They date back between 53.5-48.5 million years before present.
To the left of the fish is a trace fossil of a palm frond.
This fossil was prepared by Ben Lovatt, head curator of the Prehistoria Natural History Centre.
This plate measures ~11.5" x 9.75" and can be shipped worldwide.