Lot 124b, Auction 3/19/2026: Circular Orthoceras & Ammonite Fossil Slab Table Top

$520.00

In stock

North Africa, Morocco, Devonian Period, ca. 419.2 to 358.9 million years ago. This large, circular fossil slab is polished to reveal dramatic Orthoceras and ammonite specimens embedded within a deep black stone matrix. The verso is sealed for stability and durability. A decorative and functional piece showcasing millions of years of natural history which can be mounted onto custom metal legs for use as a unique table, or placed directly atop an existing surface to serve as a monumental coaster or display tray. Perfect for interiors that celebrate organic forms and geological wonders. Size: 24″ Diameter x 0.75″ W (61 cm x 1.9 cm)

Prehistoric ‘straight’ cephalopods include straight ammonoids called orthoceras. Cephalopod evolution began during the Late Cambrian Period. Some of these creatures evolved into semi-coiled forms, eventually giving rise to coiled cephalopods like ammonites and nautili. Straight cephalopods were among the most advanced invertebrates of their time, with eyes, jaws, and a sophisticated nervous system. These creatures were predators that swam freely using a jet propulsion system by squirting water from their bodies. They had tentacles and ink sacs, much like present-day squid. Except for belemnites, cephalopods had external shells with hollow internal chambers separated by walls called septa. A tube called the siphuncle connected the body with the chambers allowing the animal to fill them with water or air, changing its buoyancy in order to rise or drop in the ocean. Only the last and largest chamber was occupied by the living animal!

Condition: Professionally cut and polished on one planar face. Some uneven edges and scratches.

Provenance: private Colorado, USA collection

All items legal to buy/sell under U.S. Statute covering cultural patrimony Code 2600, CHAPTER 14, and are guaranteed to be as described or your money back.

A Certificate of Authenticity will accompany all purchases.

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