"Dawn Sunrise" Asteroceras Ammonite Fossil - England

This is a beautifully prepared, 2.4" wide Asteroceras obtusum ammonite fossil from the Lym Regis region of England. Much of the shell is preserved as a translucent, yellow agate. The rock has been remove from behind this translucent portion of the ammonite so that it shines like a sunrise when backlit. There is a repaired crack running through the ammonite. The rock has been cut flat so that it displays very aesthetically without the need for a 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
Asteroceras obtusum
LOCATION
Charmouth, Lyme Regis, Dorset, England
FORMATION
Lower Lias, Obtusum Zone
SIZE
Ammonite 2.4" wide
ITEM
#62902
GUARANTEE
We guarantee the authenticity of all of our specimens.