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A+ Mioplosus with Knightia + Poplar Leaf - 14.4 x 9.5 in.

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A+ Mioplosus with Knightia + Poplar Leaf - 14.4 x 9.5 in.

Availability: Out of stock

Mioplosus labracoides (Cope, 1877)
with Knightia eocaena (Jordan, 1907)
& Populus wilmattae (Poplar Tree Leaf)

Green River Formation - 50 Million years old
Kemmerer, Wyoming, USA

Amphiplaga : 5.25 x 1.25 in.
Knightia : 4 x 1.25 in.
Populus : 6.5 x 3.5 in.
Plate : 14.6 x 9.5 in.
(1 inch = 2.54 cm)

Presented here is a prepared slab of shale from the ancient Fossil Lake of Wyoming, this is a museum quality Mioplosus labracoides, complete with scales, that is along side a Knightia (Herring) and a Poplar leaf. Mioplosus with such preserved details are almost never offered for sale, let alone with multiple associations such as this!


The Green River Formation in Wyoming is one of the most famous and important Eocene (50-45 million years old) sites in the world. It provides a glimpse of the daily life surrounding the great Fossil Lake. From the prolific fossil fish deposits, the Green River Formation is also famous for it's insect, mammal, and even plant fossils! The formation exposes itself from southern Wyoming and into Utah and Colorado and shows us how life was more temperate at that time, often 60-70 degrees Fahrenheit.