3" Ammonite (Asteroceras) With Petrified Wood - Dorset, England

This is a beautifully prepared, 3" wide Asteroceras obtusum ammonite fossil from the Lyme Regis region of England. The ammonite has been prepped mostly free from the rock. Much of the shell is preserved as a translucent, yellow calcite. There is a small piece of what appears to be petrified wood preserved alongside the ammonite. The base of the rock has been cut flat for presentation purposes.

This specimen was collected and prepped by Pete Langham in 1999-2000.

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
Asteroceras obtusum
LOCATION
Black Ven, Charmouth, Lyme Regis, Dorset, England
FORMATION
Lower Lias, Obtusum Zone
SIZE
Ammonite 3" wide. Entire specimen 8.3 x 7.1"
ITEM
#171274
GUARANTEE
We guarantee the authenticity of all of our specimens.