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13.2" Giant, Bumpy Ammonite (Douvilleiceras) Fossil
This is a giant, 13.2" wide Douvilleiceras ammonite from the Upper Cretaceous of Madagascar. This genus of ammonites has earned the local name "Tractor Ammonites", due to their distinctively bumpy surface and pronounced ridges that resemble a tractor tire. It weighs a whopping 41 lbs and has several other ammonites and clams that have been composited onto the specimen. The ammonites are of the genus Cleoniceras and the clams are from the genus Astarte.
Portions of the ammonite have undergone pyrite replacement. These nodule-like pyrite formations have been polished and can be found scattered around the shell.
It comes with a metal display stand.
Portions of the ammonite have undergone pyrite replacement. These nodule-like pyrite formations have been polished and can be found scattered around the shell.
It comes with a metal display stand.
About Ammonites
Ammonites were ancient marine cephalopods, similar to today's squids and octopuses, but with a defining feature: their distinctive, tightly coiled spiral shells. These shells, resembling those of modern nautiluses, served as both a protective home and a buoyancy aid, allowing ammonites to navigate the prehistoric seas with ease. First emerging around 240 million years ago in the Triassic Period, ammonites thrived for over 175 million years, adapting through numerous forms and sizes. As predatory creatures, they likely fed on smaller marine organisms, using their tentacles to capture prey. However, their long reign came to an end 65 million years ago at the close of the Cretaceous, coinciding with the mass extinction event that also eliminated the dinosaurs.
What an ammonite would have looked like while alive.
Ammonites were ancient marine cephalopods, similar to today's squids and octopuses, but with a defining feature: their distinctive, tightly coiled spiral shells. These shells, resembling those of modern nautiluses, served as both a protective home and a buoyancy aid, allowing ammonites to navigate the prehistoric seas with ease. First emerging around 240 million years ago in the Triassic Period, ammonites thrived for over 175 million years, adapting through numerous forms and sizes. As predatory creatures, they likely fed on smaller marine organisms, using their tentacles to capture prey. However, their long reign came to an end 65 million years ago at the close of the Cretaceous, coinciding with the mass extinction event that also eliminated the dinosaurs.
What an ammonite would have looked like while alive.
$1,295
SPECIES
Douvilleiceras mammilatum, Cleoniceras sp. & Astarte sp.
LOCATION
Mahajanga Province, Madagascar
SIZE
Ammonite: 13.2" wide, 6.3" thick, Weight: 41 lbs
CATEGORY
SUB CATEGORY
ITEM
#280790
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