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Eparietites Impendens Ammonite 333mm


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Rare British Eparietites impendens ammonite block excellently conserved with several hours preparation producing a uniquely aesthetic freestanding block of large size for this type. England's lost treasures brought back to life from the famous N.E. coast of the Jurassic period. Discovered in the Frodingham ironstone layers, mined by the Romans for its rich ironstonore deposits. Read the fuller report below...

Genus: Eparietites impendens ammonite, (described by Young and Bird, 1828).
Genus: Bivalvia, Carditida, Cardiniidae; Cardinia hybrida Sowerby 1817 (clam).
Origin: Frodingham Ironstone, Conersby, Scunthorpe, Lincolnshire.
Age: Mesozoic era, Lower Lias, Obtusum zone, early Jurassic, 200 million years ago.

Block and Fossil measurements overall.
Height: 18.0 cm
Width: 33.3 cm
Depth: 7.5 cm

Eparietites approximate measurements.
Diameter: 12.4 cm
Depth: 3.1 cm

Cardinia clam approximate measurements.
Diameter: 13.5 cm
Depth: 1.0 cm

Approximate overall weight: 4084 Kg

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The ammonite exhibits vibrant green outer shell which is unique to this location and fortuitously is in association of a fine single valve of the bivalve mollusc Cardinia gigantea genus. The bed is filled throughout with several other types of fossil shell, Tancredia and Cardinia listeri and Cardinia hybrida.

The genus of Cardinia bivalves numbered over one hundred different varieties, bivalves are a distinct group of mollusc having two valves to each single animal or shell and heterodont, internal teeth or ridges essential in keeping the clam’s bivalves closed tight shut as a protection against predation. The Cardinia were seabed dwellers, burying themselves in the sediment for protection but also to feed on plankton and organic matter. Being filter feeders they used feathery like structures to separate organic matter from seawater.

The fossils have absorbed calcites in the oolitic fossil bed, through a process of a metamorphic transformation, heavily mineralised water permiating through the tissue of the shell, in a cell by cell process, leaving behind minerals which have grown, solidifying and creating a fossil shell, this giving the attractive colouration overall.

The quarries which once gave up these ancient molluscs are now as extinct as the fossils it once produced, great quantities of ammonites, during the heyday of collecting were uncovered. The days when continental fossickers raided several sites in England, however collecting is no longer viable. The iconic quarries were eventually filled decades ago, the fossil material which once originated from this location is becoming increasingly difficult to obtain throughout the UK fossil scene.