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3.1" Calcite-Replaced Ammonite (Aegasteroceras) Fossil - England
This is an absolutely beautiful ammonite fossil from the Conesby Quarry near Scunthorpe in North Lincolnshire, England. It's Lower Jurassic in age, or approximately 200 million years old. The ammonite is of the species Aegasteroceras sagittarium and measures 3.1" wide. The shell of the ammonite was naturally replace by calcite crystals which contrasts nicely with the fossilized septae. The base of the rock has been cut flat for aesthetic presentation of the ammonite 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.
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
Aegasteroceras sagittarium
LOCATION
Conesby Quarry, Scunthorpe, North Lincolnshire, England
FORMATION
Frodingham Ironstone, Obtusum Zone
SIZE
3.1" wide ammonite, entire specimen 4.5 x 4.45" wide
CATEGORY
SUB CATEGORY
ITEM
#206483
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