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Two Iridescent Fossil Ammonites (Discoscaphites) - South Dakota
These are two (Discoscaphites conradi) ammonites from the Fox Hills Formation of South Dakota. The iridescence of the outer shells creates a colorful display. This specimen has been well prepared and remains attached to the rock in which it was found. The rock contains a variety of other small marine bivalves and measures 6.4".
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
Discoscaphites conradi
AGE
LOCATION
North Central, South Dakota
FORMATION
Fox Hills Formation
SIZE
2.1" ammonite, 6.4 x 4.4" rock
CATEGORY
SUB CATEGORY
ITEM
#137288
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