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Excellent Fossil Ammonite Cluster - South Dakota
This is a fossil ammonite cluster from the Fox Hills Formation of South Dakota. It's been wonderfully prepared on the hard concretion it was found in. The largest ammonites are a 2.15" Hoploscaphites nicolletti and a 1.7" Discoscaphites gulosus. The total height of this cluster is 4.3". There are a number of complete Hoploscaphites nicolleti ammonites, along with fragments of shells still partially concealed in the stone.
There are crack repairs through the Hoploscaphities nicolletii and both the Hoploscaphites spedeni and Discoscaphites gulosus ammonites were removed from the rock, prepped and then remounted to the original portion of the rock they were found in.
There are crack repairs through the Hoploscaphities nicolletii and both the Hoploscaphites spedeni and Discoscaphites gulosus ammonites were removed from the rock, prepped and then remounted to the original portion of the rock they were found in.
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.
SPECIES
Hoploscaphites nicolletii & Discoscaphites gulosus
LOCATION
South Dakota
FORMATION
Fox Hills Formation
SIZE
Largest ammonites - 2.15" wide H. nicolletti and 1.7" wide D. gulosus
CATEGORY
SUB CATEGORY
ITEM
#131227
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