Geology Superstore
Geology Superstore


£9.00 ex VAT

Diplomystus sp fossil fish specimens from the famous Green River formation in the state of Wyoming, USA. These fish (of which the exact species is undermined) lived in a fresh water lake in what is now Wyoming and died en mass, fossilising in the calcite rich sediment at the lake floor. They are identifiable as Diplomystus due to their rounder and larger body as opposed to the more slender, Knightia fish also found in the same formation. They fossils are between 50 to 90 mm and show the overall shape of the fish as well as the spine, ribs and fins and are thus ideal for educational use or as gifts. Each sample will come supplied in a white card tray with an information label.



  •  Delivery & Return


    We ship to all 50 states, Washington DC.
    All orders are shipped with a UPS tracking number.
    Always free shipping for orders over US $200.
    During sale periods and promotions the delivery time may be longer than normal.


    Elessi will accept exchanges and returns of unworn and unwashed garments within 30 days of the date of purchase (14 days during the sales period), on presentation of the original till receipt at any store where the corresponding collection is available within the country of purchase.

    Your return will usually be processed within a week to a week and a half. We’ll send you a Return Notification email to notify you once the return has been completed.
    Please allow 1-3 business days for refunds to be received to the original form of payment once the return has been processed.


    Give us a shout if you have any other questions and/or concerns.
    Phone: +1 (23) 456 789

  ... people are viewing this right now
Guaranteed Safe Checkout

Diplomystus sp fossil fish preserved on a calcite shale matrix. These particular samples were found in the famous Green River formation in the state of Wyoming, USA, a location which has yielded numerous exceptionally preserved fossils from bird and fish to amphibians and even mammals. The animal its self was a bony fish related to modern day herrings and lived in fresh water lakes in what are now Asia and North America during the lower part of the Eocene epoch. It is understood that the mass preservation of fish in this formation is down to a combination of the fish dying in large numbers due to lack of oxygen in the deeper areas of the lake, likely due to predation from above forcing them deeper. The deeper areas of the lake being anoxic (low oxygen), dark and full of a fine silt sediments. The renowned colour of the fossils, which is a deep red or brown colour is due to the animals blood upon preservation, which would have broken down leaving the iron behind which mineralised during the fossilisation process. The specimens are not ideal for serious collectors but are certainly a good fit for educational use as they depict the fish’s body, features and anatomy fairly good as well as depicting excellent yet rare conditions that must be met for fossilisation to occur, especially on this scale. The specimens themselves range in size between 50 to 90 mm in length and can be identified as diplomystus due to the larger body when compared to the often slimmer knightia which are also found in the same rocks (which were preyed upon by the diplomystus). The matrix (rock) that the fossils are one are approximately 10 to 14 cm in length and have been cut into rectangle shapes to better sit on stands should you wish to display them. Each sample will come supplied in a white card tray with an information label. Ideal for educational use, gifts or for children who are interested in geology or fossils.

Weight 220 g

Based on 0 reviews

0.00 Overall
Be the first to review “Diplomystus”

Your email address will not be published. Required fields are marked *


There are no reviews yet.

SKU: Diplomystus_fish Category: Tags: , , , , , , , ,
Close My Cart
Close Wishlist
Recently Viewed Close