Description
Fossil, Fish Specimen mounted in a Riker Mount. A Riker mount is a shallow, glass-front display case commonly used by collectors and museums to safely showcase small specimens such as insects, minerals, fossils, or historical artifacts.
You will receive this specimen, or one like it.
Fossilized Fish from Kemmerer, Wyoming — an interestingly instructive overview
A fossilized fish from Kemmerer, Wyoming is a stunning relic of an ancient lake ecosystem — a perfectly preserved imprint of life from the Eocene Epoch, about 50 million years ago. When displayed in a Riker mount, it transforms into a compact museum exhibit: both a work of natural art and a geological record of deep time.
1) The ancient lake that made it possible
Around 50 million years ago, southwestern Wyoming was home to Fossil Lake, part of a subtropical basin surrounded by lush vegetation and thriving with fish, turtles, insects, and early mammals. Fine carbonate mud slowly settled at the lake’s bottom, creating oxygen-poor conditions that prevented decay and allowed extraordinary fossil preservation.
The result: exquisitely detailed fish fossils, some showing scales, fins, and even stomach contents, frozen in limestone slabs like pages from an ancient biological diary.
2) What species you might find
Kemmerer’s quarries, part of the Green River Formation, yield several beautifully preserved species, including:
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Knightia eocaena – a small schooling fish, Wyoming’s state fossil.
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Diplomystus dentatus – a predatory relative with upturned jaws.
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Priscacara – a spiny, perch-like fish.
Each species offers insights into food webs, evolution, and environmental conditions of early Cenozoic lakes.
3) Fossilization and scientific importance
Fish carcasses sank into calm, lime-rich lake beds where lack of oxygen halted decomposition. Over millions of years, calcium carbonate lithified the sediments, and minerals replaced or outlined soft tissues — producing the finely detailed fossils we see today.
These fossils are vital to science because they preserve entire ecosystems, helping paleontologists reconstruct climates, biodiversity, and lake chemistry from an ancient greenhouse Earth.
4) Displaying it in a Riker mount
A Riker mount — a shallow, glass-fronted display case with soft cotton or foam backing — offers a professional, protective setting for smaller fish slabs or fragments.
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Protection: Keeps the limestone stable and free from dust or handling damage.
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Presentation: The neutral black or white background enhances fossil contrast.
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Labeling: Include specimen name, species (if known), “Green River Formation, Eocene, Kemmerer, Wyoming,” and approximate age.
5) Why this specimen captivates
Each fossil fish from Kemmerer is both a snapshot of ancient life and a natural work of art — a fossil so detailed it looks ready to swim off its limestone stage. Displayed in a Riker mount, it becomes a timeless blend of science and beauty — a direct connection to an ancient lake that once shimmered where Wyoming’s deserts lie today.
Fossil, Ammolite Specimen mounted in a Riker Mount
