Description:

East Africa, Madagascar, Cretaceous Period, ca. 145 to 66 million years ago. A sizable ammonite fossil of the Cleaniceras genus that has been cut and polished to reveal the natural and fascinating interior whorl pattern, sutures, and vugs (cavities filled with crystals). The material inside the chambers turned into quartzite stone when water with silica and other minerals in the ocean sediment seeped in, permeating the organic material and later solidifying. The septu or walls divide the chambers which contain a mix of calcite or sedimentary infills that are polished smooth, and recessed vugs where the textured crystals coat the surface are both aesthetic and scientifically fascinating! Sliced in half, the shell cold be arranged on a bookshelf like book ends or as aesthetic table décor. Size: 11.5" Diameter x 1" W (29.2 cm x 2.5 cm)

Provenance: purchased at the Denver Gem and Mineral Show, Denver, Colorado, USA in September 2022

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#175285

  • Condition: Professionally prepared, cut and polished. Stable fissures and striations throughout from fossilization and excavation. Exterior is covered in a clear fixative coating to protect the shell. Interior vugs and natural cavities in the polished surface as shown. Great coloration and size!

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November 17, 2022 8:00 AM MST
Louisville, CO, US

Artemis Fine Arts

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$100,000 $199,999 $10,000
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