Fossil Ammonites (Promicroceras) Plate- Lyme Regis

This is a very beautifully agatized, Promicroceras planicosta ammonite fossil plate, collected from Lyme Regis, England. They are almost translucent and have been nicely prepared to display very well on the limestone slab. This plate contains the positive fossil or negative impression of at least 6 ammonites on the front and an additional one on the reverse side. This is an amazing specimen.

Comes with an acrylic 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.