In Stone Fossils

Crossopholis magnicaudatus (Paddlefish)

$17,000.00 Regular price

Crossopholis magnicaudatus (Paddlefish)

Eocene (52.3 Million Years Ago) 

Green River Formation, Wyoming, USA 

In Stone Fossils Private Quarry

 

Paddlefish - Crossopholis magnicaudatus

Order Acipenseriformes, Family Polydontidae
C. magnicaudatus is often preserved with fish in the stomach, indicating this species was a predator. This fossil species is most commonly found in shallow-water deposits, but very few juveniles have been discovered. This could possibly indicate that C. magnicaudatus matured and spawned in connecting rivers before migrating to Fossil Lake as an adult.
This species' name comes from the thousands of tiny, fringed scales covering its body, crossopholis meaning 'fringed scale.'
The maximum known size of this fossil species is 4 feet.
Crossopholis magnicaudatus (Paddlefish)
This Paddlefish is truly a remarkable specimen as it closely resembles the recently extinct (due to overfishing) Chinese paddlefish (Psephurus gladius) which fed on small fish and crustaceans, unlike the American paddlefish of today that are filter feeders.

This Paddlefish specimen was found within the mini fish layers of the Green River Formation from our private quarry. Because the mini fish layers are prone to delamination (peeling), we've inlaid the Paddlefish specimen into a thicker, more durable minifish layer than what was the Paddlefish's original unstable host matrix.

Presented on the host matrix, a 50 million year old snapshot of a catastrophic event which took place at the bottom of Fossil Lake. Several Knightia eocaena, perhaps a school of these small fish, met their end. As the fish began to decompose on the lake bottom floor, evidence on this particular "snapshot" shows swim trails. A tail fin from a larger fish (perhaps Diplomystus) swam and dragged it's tail, disturbing the decomposing fish in it's path. Were larger fish not affected by this particular mortality event? Could this larger fish have traveled across the lake to spawn, and was not affected by the same catastrophic event? Maybe the larger fish took more time to perish?
The story of what happened at Fossil Lake within these mass mortality layers are still debated. So far, evidence of an ash fall from a local volcanic event is being investigated by paleontologists. Another theory, a plume of gas could have escaped from a pocket underneath the lake, disturbing the PH balance of the water.

Plate approx: 45" x 42"
Paddlefish approx: 38"
Due to the size of this specimen, it will be shipped in an internationally compliant wooden crate. The plate itself is backed with 3/4" plywood for durability and easy wall hanging, a french cleat hanging system is included as well.
Please contact us for a specific shipping rate. We've created a standard shipping price for easy purchase within this website. If you choose to purchase with our standard shipping rate, we will still find a lower rate to ship to your area and refund to you any outside cost. We do not intend to profit from shipping rates. However, should shipping costs increase, you are responsible to pay the outstanding fee. You may opt in for in-store pickup to cut your shipping costs all together and pick up your specimen in person. You can pick up from our store location in Kemmerer, Wyoming, or we deliver to both the Denver Gem & Mineral show in the Fall and the Tucson Gem & Mineral show in the winter. For any questions, please don't hesitate to contact us directly.