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Knightia eocaena 3.75"
Knightia eocaena 3.75"
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Knightia eocaena 3.75"

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Knightia eocaena, restored specimen
Eocene (52.3 Million Years Ago) 
Green River Formation, Wyoming, USA 
In Stone Fossils Private Quarry 


Plate size approx: 5.5" x 3.5" 

Fish Size: 3.75" 

Knightia eocaena & Knightia alta

Order Clupeiformes, Family Clupeidae
The Clupeidae family has an estimated 50 modern freshwater species. Clupeidae species can lay as many as 200,000 eggs at once, allowing species to multiply quickly. Modern species are also prone to mass die offs.
K. eocaena is:

  • The most common fish found from Fossil Lake.
  • The most commonly found articulated vertebrate fossil in the world.
  • The Wyoming state fossil.

Both K. eocaena and K. alta are frequently discovered in mass mortality plates, some containing up to 100 fish per square meter. This suggests that, like their modern relatives, the Knightia species were sensitive to environmental changes.
K. eocaena specimens of all sizes are found in mass mortality plates, indicating this species schooled as both a juvenile and adult. The average adult size of K. eocaena specimens is about 6 inches, though specimens as large as 10 inches have been found.