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12.7" Jurassic, Cut & Polished Ammonite (Half) - Madagascar
This is a stunning, 12.7" wide, orange colored ammonite fossil which has been cut in half and polished to reveal the inner chamber detail. It was collected near Sakaraha in the Tulear Province of Madagascar and is Late Jurassic in age, or approximately 160 million years old.
Many of the living chambers remained hollow during fossilization and became lined with orange colored quartz crystals in a similar process to how geodes form. There are quite a few species/genus of the Phylloceratid family, this ammonite of which is possibly of the genus Lobolytoceras.
As with nearly all of the larger ammonites there is some repair work as they are naturally fractured while in the ground and need to be stabilized during the collection and preparation process. One half of the ammonite is included along with a display stand.
Many of the living chambers remained hollow during fossilization and became lined with orange colored quartz crystals in a similar process to how geodes form. There are quite a few species/genus of the Phylloceratid family, this ammonite of which is possibly of the genus Lobolytoceras.
As with nearly all of the larger ammonites there is some repair work as they are naturally fractured while in the ground and need to be stabilized during the collection and preparation process. One half of the ammonite is included along with a display stand.
About Ammonites
Ammonites were predatory, marine mollusks that thrived during the Paleozoic and Mesozoic eras, particularly in the Jurassic and Cretaceous periods, before going extinct around 66 million years ago. These creatures are characterized by their coiled, spiral shells, which resemble the modern-day nautilus. Ammonite shells were divided into chambers; as they grew, they built new chambers and sealed off the old ones. These chambers were filled with gas, which helped them control buoyancy in the ocean.
The outer shell of ammonites often displays intricate ribbed or ridged patterns and their fossils sometimes show a wide range of beautiful colors due to mineralization over time. The shells fossilized well, making ammonites abundant in the fossil record.. In addition to being popular in fossil collections, ammonites are valuable in geological studies, as they serve as index fossils, helping scientists date rock layers and understand the Earth's prehistoric environments.
Artist's reconstruction of an ammonite, by Nobu Tamura
Ammonites were predatory, marine mollusks that thrived during the Paleozoic and Mesozoic eras, particularly in the Jurassic and Cretaceous periods, before going extinct around 66 million years ago. These creatures are characterized by their coiled, spiral shells, which resemble the modern-day nautilus. Ammonite shells were divided into chambers; as they grew, they built new chambers and sealed off the old ones. These chambers were filled with gas, which helped them control buoyancy in the ocean.
The outer shell of ammonites often displays intricate ribbed or ridged patterns and their fossils sometimes show a wide range of beautiful colors due to mineralization over time. The shells fossilized well, making ammonites abundant in the fossil record.. In addition to being popular in fossil collections, ammonites are valuable in geological studies, as they serve as index fossils, helping scientists date rock layers and understand the Earth's prehistoric environments.
Artist's reconstruction of an ammonite, by Nobu Tamura
SPECIES
Lobolytoceras sp.
LOCATION
Sakaraha, Tulear Province, Madagascar
SIZE
12.7" wide
CATEGORY
SUB CATEGORY
ITEM
#191048
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