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7.3" Cretaceous Heteromorph Ammonite (Didymoceras) - South Dakota
This is a gorgeous and extremely uncommon, 7.3" wide heteromorph ammonite (Didymoceras nebrascense) fossil collected from the Cretaceous-aged Pierre Shale of South Dakota. The rock has been meticulously worked away to expose this incredible ammonite specimen. Portions of the iridescent shell can be found around much of the ammonite.
Comes with an acrylic/metal display stand.
There are multiple repaired cracks throughout this specimen, along with some areas of gap fill and surface restoration. The smallest half of this ammonite is likely a composite.
Comes with an acrylic/metal display stand.
There are multiple repaired cracks throughout this specimen, along with some areas of gap fill and surface restoration. The smallest half of this ammonite is likely a composite.
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.
$4,495
SPECIES
Didymoceras nebrascense
LOCATION
South Dakota
FORMATION
Pierre Shale
SIZE
Ammonite: 7.3" wide, Entire specimen: 8.1 x 6.2
CATEGORY
ITEM
#306621
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