Ammonites on Matrix (Quenstedtoceras sp., Jurassic) - Volga River, Ulyanovsk, Russia This extremely

Ammonites on Matrix (Quenstedtoceras sp., Jurassic) - Volga River, Ulyanovsk, Russia This extremely artistic assemblage of large and small ammonites from Russia demonstrate an intense iridescence and highlights due to the presence of metallic Pyrite. The cluster has been positioned on a new matrix, as the grainy rock in which these Quenstedtoceras cephalopods were collected is not hard nor stable enough to display them permanently. The added component is an attractive piece of what is known as septarian, a mud-like material that grows in nodules. In this instance, yellowish Calcite crystals and gray sediment have formed the rock on which these colorful ammonites reside. The cluster is quite representative of the Volga River material, and that combination results in a dramatic display specimen. Overall Measurements: 6.30 x 5.51 x 5.71 inches (16.00 x 14.00 x 14.50 cm) -- source link
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