STAY SAFE . Read More >

Free UK Delivery . Always >

Authenticity . Guaranteed > 

Knightia Alta

Knightia Alta Fish 220mm

£182.00 GBP

A superb single plate with a fine Knightia Alta fossil fish measuring 220mm exhibiting subtle and delicate palettes throughout. Incredibly well preserved in the calcite bearing shale which was once the mud of an exotic prehistoric lagoon. The plate has been created by lifting the shale which is now part of the Rocky Mountain range in Wyoming. Once lifted the shales are split in an attempt to recover these rare occurrences of preserved fish skeletons. This particular fish is complete and displays excellent morphology for study. While also creating a superb and beautiful display, now encased in an oak frame and ready to hang.

The Knightia Alta fossil fish an ancestor of the herring family, a very finely boned fish which is extremely difficult to prepare from the Lagerstätte varve layer of the Eocene limestones of the Green River formation 18-inch layer. These predator fish of an ancient freshwater lagoon have been discovered with other prey fish in its stomach contents, Knightia Alta, Knightia Eocaena and Priscacara Serrata all other inhabitants of the prehistoric fossil lakes and have occasionally found to the latter fishes stuck in its gullet. These so-called aspiration deaths are rare, difficult to interrupt as to the actual cause of the death of the predatory fish. The two main theories as to why aspiration fish deaths are found in the fossil deposits are, firstly the predator fish could not swallow the prey which became lodged in its throat and suffocated the attacker. Alternatively that the deoxygenation of the lake suffocated all fishes including the fish in the act of hunting and feeding.

The lower Eocene deposits of Green River formation was thought to be a large freshwater lake or lagoon which often suffered from falls of volcanic ash smothering the lagoon and creating an anoxic environment. This reduction of oxygen suffocated the inhabitants of the lake, this circumstance preserved exceedingly well the fishes and fauna of this region, a unique occurrence in the fossil record. The lack of oxygen gave little chance for bacteria to quickly establish and decay the fishes, flora and other fauna deposited in the muds at the bottom of the lake which would eventually be transformed into soft calcite bearing shale. The calcite would be absorbed by the remains of the fish, transforming their bones into a hard mineralised deposit in the slightly softer and lighter coloured limestone shales.

The fossil formation was discovered and described by Edward Drinker Cope in 1877 an American palaeontologist and comparative anatomist. In the last quarter of the nineteenth-century fossil collecting was so popular a personal feud between two great palaeontologists grew in momentum, Cope and another palaeontologist Othniel Charles Marsh became intensely competitive in discovering new dinosaur fossils, this led to a race of collecting termed the bone wars.

The eighteen-inch layer is a lower Eocene varve layer, is not fissile laminae and therefore much more difficult to split and work successfully, older in the fossil lakes system containing fish which have been preserved which calcite mineralisation. The mineralisation is caused by absorption of localised mineral elements being absorbed by the process of osmosis. Water coursing through the mud layers at the time of deposition deposited minerals in the tissues of the fish, in this case, its skeletal elements, bones teeth and cartilaginous parts. In this 18 inch layer, this exhibits in a dark calcite skeleton encapsulated in light coloured limestone of the Lagerstätte fossil varved lime muds. The mineral preserves every fine detail of this particular fossil bed, a very rare occurrence indeed.

Genus: Knightia Alta. Order Clupeifomes, Family Clupeidae.
Age: Eocene, 56,000,000 to 33.9,000,000 years.
Origin: Green River Formation, Wyoming, USA.

Knightia plate measurements.
Height: 21.0 cm
Width: 22.0 cm
Thickness: 1.5 cm

Weight: 1.248 Kg

- BE SAFE + STAY SAFE  |  Protecting you by protecting us

The health and wellbeing of our customers and employees are of the utmost importance whilst we continue to give you the high-quality experience you are used to - thank you for your ongoing support and understanding.

Stay safe - THE FOSSIL STORE team

Keep up to date and STAY SAFE >

If you need assistance with this product, we're here to help. Just include the product 'TITLE + REF Number' when you get in touch.

Call us: +44 [0] 151 342 1151
Email us: info@thefossilstore.com

 

CONTACT FORM >

Free standard UK delivery - Recorded/Signed-for

All UK orders include free delivery, excluding Ireland, Scotland and the Highlands.

This product is available for worldwide delivery.

A certificate of authenticity is included with all our products.

Email info@thefossilstore.com for a special delivery date. Special delivery requests on large products are subject to handling and courier times.

UK small orders arrive 1 - 7 business days.
UK large orders arrive 7 - 14 business days.

Call us: +44 [0] 151 342 1151
Email us: info@thefossilstore.com

 

CONTACT FORM >

For delivery costs, add this product to the BAG and at the bottom of the Pop-Out BAG - select your country and enter your post code to calculate a the delivery cost.

✓ STAY SAFE

- BE SAFE + STAY SAFE  |  Protecting you by protecting us

The health and wellbeing of our customers and employees are of the utmost importance whilst we continue to give you the high-quality experience you are used to - thank you for your ongoing support and understanding.

Stay safe - THE FOSSIL STORE team

Keep up to date and STAY SAFE >

✓ Get In Touch

If you need assistance with this product, we're here to help. Just include the product 'TITLE + REF Number' when you get in touch.

Call us: +44 [0] 151 342 1151
Email us: info@thefossilstore.com

 

CONTACT FORM >

✓ Free UK Delivery

Free standard UK delivery - Recorded/Signed-for

All UK orders include free delivery, excluding Ireland, Scotland and the Highlands.

✓ Worldwide Delivery

This product is available for worldwide delivery.

✓ Authenticity Guaranteed

A certificate of authenticity is included with all our products.

✓ Specify Delivery Date

Email info@thefossilstore.com for a special delivery date. Special delivery requests on large products are subject to handling and courier times.

UK small orders arrive 1 - 7 business days.
UK large orders arrive 7 - 14 business days.

Call us: +44 [0] 151 342 1151
Email us: info@thefossilstore.com

 

CONTACT FORM >

✓ Delivery Calculator

For delivery costs, add this product to the BAG and at the bottom of the Pop-Out BAG - select your country and enter your post code to calculate a the delivery cost.

For a seamless experience from start to finish we offer FREE UK delivery - Always.

Subtotal £0.00 GBP

PayPal | Apple Pay | Amazon Pay | Google pay

Checkout

FREE UK delivery + Certificate of authenticity included