2.2" Cretaceous Ammonite (Jeletzkytes) Fossil - Wyoming

This is a 2.2" fossil ammonite (Jeletzkytes sp.) from the Late Cretaceous collected in Weston County, Wyoming. There are two smaller specimens just below it in the rock. All of the fossils display some red flashes of iridescence.

This comes out of an old collection of ammonite fossils we recently acquired including some from some unusual locations. Includes an acrylic 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.
What an ammonite would have looked like while alive.
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DETAILS
SPECIES
Jeletzkytes sp.
LOCATION
Weston County, Wyoming
FORMATION
Pierra Shale
SIZE
2.2" wide
CATEGORY
ITEM
#180842
GUARANTEE
We guarantee the authenticity of all of our specimens.