Ammonite Macrocephalites Polished Large 10.7cm

Large Polished Ammonite Fossils For Sale (Macrocephalites Ammonites)

This stunning, high-grade Large Polished Ammonite Fossil from Madagascar, of the Macrocephalites Ammonite Species, measures 10.7cm wide and has been carefully polished on top of its fossilised shell, which displays beautifully rich brown colours and striking suture patterns. 

Dating from the Jurassic Period at a majestic 163 million years old, this gorgeous Macrocephalites Ammonite Fossil is an exciting piece of history.

The Ammonite comes with a complementary Plastic Display Stand for displaying fossils in the home. 

This Large Ammonite Fossil displays a glistening shell and its mouth has been expertly prepared out to the sutures. 

This genuine, real Ammonite Fossil, found in the jungles of Madagascar, has been carefully hand-polished to reveal the beauty of its colourful Calcite mineral replacements, as well as its impressive fern-like suture patterns.

The original Ammonite Shell was replaced over a very long period of fossilisation, wherein water dissolved the original hard parts of the ammonite shell and replaced it with mineral matter: most commonly, Calcite minerals. 

What Are Ammonites? 

Ammonites are a group of extinct molluscs which somewhat resembled a shelled squid when they were alive.

These ancient sea creatures had tentacles like the modern octopus, and spiral shells like Nautilus creatures. 

The fossilised remains of these sea creatures are perhaps the most popular fossils in the world today. 

What Are Macrocephalites Ammonites? 

This particular ammonite is a member of the Macrocephalites species of ammonites. 

Macrocephalites is an extinct genus of Ammonite that mainly lived during the Middle Jurassic Period in the Callovian Stage, in the time frame that spanned from approximately 165 millions years ago to 160 million years ago. 

How Old Are Ammonites? 

Ammonites first appeared on the fossil record around 240 million years ago, in the Triassic Period, and died out 65 million years ago with the dinosaurs during the Cretaceous-Tertiary Mass Extinction Event. 

This Macrocephalites Ammonite Fossil dates back to the Jurassic Period, meaning it is approximately 163 million years old. 

Although this particular species of ammonite fossil is an example of a fossil from the Jurassic Period, there are many ammonite species such as Perisphinctes Ammonites which are even older: Perisphinctes Ammonites are fossils from the Triassic period and are approximately 248 million years old! 

Where Do Ammonites Come From?

Ammonite Fossils can be found in many countries worldwide: Ammonites swum all around the seas of the world millions of years ago, and their fossils wash up on many shores worldwide. 

Our Ammonites, including this piece, are Ammonite fossils from Madagascar: this Ammonite Fossil is from the Tulear region of Madagascar. 

Madagascar fossils and crystals are renowned world-wide for their quality and variety, with Madagascar Ammonites being some of the most revered, high-quality Ammonite Fossils in the world. 

How Were Ammonites Fossilised?

When an Ammonite died, it was preserved through a slow fossilisation process that took place over millions of years, beginning with the Ammonite's body sinking into seabed sediment, and culminating in the Fossilised Ammonite being preserved within layers of minerals and rock.

• The Ammonite died, and its body sunk into the seabed sediment

• The Ammonite body began to decay and decompose: during the decomposition process, bacteria broke the ammonite body down and water started to dissolve the original ammonite shell (this shell was later replaced with minerals like Calcite)

• This process of decomposition affected redox conditions in the marine environment, leading to dissolved minerals such as carbonates and phosphates becoming less soluble in the surrounding sea water

• These hardened, previously dissolved minerals were precipitated out of the water, and enveloped the ammonite in a solid concretion like a rock, which ensured the ammonite shell was fossilised and preserved

• Some minerals which seeped into the ammonite remains, such as colourful Calcite minerals, replaced the decomposed organic matter of the ammonite body over time, leading to the ornately patterned interiors and colourful chambers of Ammonite Fossils (via mineral replacements)

• The rock concretion covering the ammonite fossil was then either naturally eroded, or excavated by humans, to expose the fossil within

Sacred Geometry Of Ammonite Spirals

In sacred geometry, the spiral shape has powerful spiritual significance, and signifies growth and expansion.

As ammonite shells display distinctive spiral shapes, ammonites embody this spiritual meaning of growth too. 

An ammonite shell is a perfect example of the sacred Golden Mean Spiral, a symbol of the infinite Fibonacci Sequence and the revered Golden Ratio. 

As a result, ammonites are believed to be strongly symbolic of order and perfection in not just the natural world, but the entire universe. 

Ammonite Fossil Collections

This stunning Large Polished Macrocephalites Ammonite Fossil was specially selected for its quality, and would make a perfect addition to any fossil collection or ammonite collection. 

The Ammonite comes with a complementary Plastic Display Stand for displaying fossils in the home. 

This striking Large Ammonite Fossil would make a great fossil gift. 

Buy Large Ammonite Fossils Online at Madagascan Direct. 

Product Reference Number: 10835