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8.2" Hoploscaphites Ammonite Association- Pierre Shale, Montana
This is an association of multiple bumpy, Hoploscaphities ammonites collected from the Pierre Shale of Montana. There are six mostly complete Hoploscaphites ammonites in addition to some partials and a bevy of other marine fossils, including bivalves and gastropods. The association was prepared with a portion of the original rock left intact.
An acrylic stand is included for display options.
An acrylic stand is included for display options.
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.
These 70 million year old ammonites lived when South Dakota was a shallow inland sea. They were found preserved in concretions when split open. They then had to be hand-prepared to remove the hard rock surrounding them from their shells, a very time consuming task.
SPECIES
Hoploscaphities crassus
LOCATION
Garfield County, Montana
FORMATION
Pierre Shale - Baculites baculus Zone
SIZE
Largest Ammonite: 2.7" wide, Entire specimen: 8.2 x 5.7"
CATEGORY
ITEM
#209669
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