2.2" Fossil Ammonite (Pachydiscus) - Alaska

This is a 2.2" ammonite (Pachydiscus) from the Kaguyak Formation of Alaska. It is in good condition. Some of the inner shell remains showing the intricate suture lines. It is from an old collection and has a painted label.

This ammonite comes out of an old fossil collection we recently purchased with a lot of unique material from unusual and often no longer accessible sites.

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
Pachydiscus kamishakensis
LOCATION
Douglas River, Alaska
FORMATION
Kaguyak Formation
SIZE
2.2"
CATEGORY
ITEM
#117202
GUARANTEE
We guarantee the authenticity of all of our specimens.