Fossil fish and palm frond
As if seeing an old photo (actually very old), this extraordinary fossil exhibits part of the freshwater paleoenvironment of the Eocene (56 to 34 million years ago) in the Fossil Butte (Fossil Lake), Green River Formation, Wyoming, US.
The fish in this specimen are Knightia eocaena (Clupeidae), an extinct bony fish related to herring and sardines, considered the state fossil of Wyoming. The palm frond is Sabalites powellii (Arecales - Palmae), an extinct large-leaved fan palm.
Photo credit: ©Doug Sherman