Rare specimen - Ammonite Speetoniceras versicolar - Ulyanovsk, Russia - Pyritized ammonite - Fossil fragment - 250 mm - 210 mm





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Description from the seller
Completely pyritized ammonite of the species Speetoniceras Versicolar. This species of ammonite, belonging to the family of extinct marine mollusks, lived millions of years ago during the Mesozoic period.
What makes this ammonite particularly interesting is its complete pyritization. Pyritization is a geological process in which the tissue of the marine organism transforms into pyrite, a iron sulfide mineral. This fossilization process has exceptionally preserved the internal details of the ammonite, including its characteristic spiral segments and the chambers that developed inside the shell.
To highlight the internal chambers of the ammonite, the fossil was carefully sectioned. This cross-section reveals the intricate spiral structures of the internal chambers, which formed during the ammonite's growth. It is as if it were frozen in time, allowing us to explore the internal architecture of this ancient marine creature.
This pyritized ammonite fossil is a testament to the evolution of life on Earth and an invitation to explore the mysteries of our geological past. Every detail of the sectioned ammonite reveals Mother Nature's skill in creating extraordinary forms of life, providing us with a fascinating glimpse into antiquity.
Seller's Story
Completely pyritized ammonite of the species Speetoniceras Versicolar. This species of ammonite, belonging to the family of extinct marine mollusks, lived millions of years ago during the Mesozoic period.
What makes this ammonite particularly interesting is its complete pyritization. Pyritization is a geological process in which the tissue of the marine organism transforms into pyrite, a iron sulfide mineral. This fossilization process has exceptionally preserved the internal details of the ammonite, including its characteristic spiral segments and the chambers that developed inside the shell.
To highlight the internal chambers of the ammonite, the fossil was carefully sectioned. This cross-section reveals the intricate spiral structures of the internal chambers, which formed during the ammonite's growth. It is as if it were frozen in time, allowing us to explore the internal architecture of this ancient marine creature.
This pyritized ammonite fossil is a testament to the evolution of life on Earth and an invitation to explore the mysteries of our geological past. Every detail of the sectioned ammonite reveals Mother Nature's skill in creating extraordinary forms of life, providing us with a fascinating glimpse into antiquity.

