4.5" Promicroceras Ammonite Cluster - Dorset, England

Promicroceras Ammonite Cluster - Dorset, England #65363

This is a beautiful cluster of agatized, Promicroceras planicosta ammonites from the Lyme Regis region of England. They arealmost translucent and has been nicely prepared so that it displays nicely in a slab of limestone. The base has been cut flat so that it stands up nicely on a hard surface. The entire piece is 4.5" tall with the largest ammonite being .9" across.

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.

SPECIES

Promicroceras planicosta

AGE

Lower Jurassic (200 Million Years)