Fossils for Sale - High-quality BRITISH and WORLDWIDE Fossils. An impressive selection of fossils, including Ammonites, Trilobites, Belemnites, Fossil Fish, Fossil Shark Teeth, Fossilised Insects in Amber, Dinosaurs, and Reptiles. UK Fossils was formed in 1988 and collects and preps our own fossils in the heart of the Jurassic Coast, collecting fossils from Lyme Regis, Charmouth and Somerset. Our passion for fossils is reflected in our carefully curated collection, which includes some of the rarest and most unique specimens available.

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Fossil Ammonite Half - Cretaceous - Madagascar - Polished Cut Section - Genuine Prehistoric Fossil - Certificate of Authenticity
Fossil Ammonite Half - Cretaceous - Madagascar - Polished Cut Section - Genuine Prehistoric Fossil - Certificate of Authenticity - Image 2

Fossil Ammonite Half – Cretaceous – Madagascar – Polished Cut Section – Genuine Prehistoric Fossil – Certificate of Authenticity

£72.00

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity

**Please note: Some Fossils maybe propped up for photo purposes**

Specimen: Ammonite Half

Location: Madagascar

Age: Cretaceous

Size (picture scale cube=1cm):   123 x 18 x 102mm (4.84 x 0.71 x 4.02 inches)

Ammonites are one of the most recognisable fossils around, this is due to their familiar spiral shape shell, reminiscent of what we know as a snail shell, though these creatures are not related to snails at all! They were marine animals, present between 240 – 65 million years ago, who had a coiled external shell similar to that of the modern nautilus, and although they resembled a modern day nautilus, these molluscs are more closely related to living coleoids (i.e. octopuses, squid, and cuttlefish!)

These stunningly beautiful ammonites have been sliced in half and polished to expose the amazing colourful chambers inside the fossil.

 

ACTUAL AS SEEN: The image shows the EXACT specimen you will receive. The specimen has been carefully hand selected and photographed. Measurements are as accurate as possible, though be aware measuring precise dimensions can be difficult from irregular shaped items. Whilst we portray colours as close to life-like as we can, colours will vary if taken in sunlight, indoors, from monitor to monitor and device to device. Once this specimen is sold, we will update this listing with new similar selected item, with a new photo and dimensions.

(Actual as seen)

Only 1 left in stock

SKU: FSR490 Category:

Description

This listing features a genuine cut and polished half Ammonite fossil from the Cretaceous period, discovered in Madagascar. The fossil showcases the internal chambers of the ancient marine mollusc in beautiful detail, revealing natural mineralisation and preserved suture patterns typical of Ammonite shells.

Each piece is expertly cut and polished to highlight its intricate internal structure — a spiral of once gas-filled chambers used for buoyancy. These make not only excellent collector specimens but also timeless display items and educational tools.

Scale cube = 1cm — please refer to the photo for full sizing. The image represents an example specimen; you will receive one of similar high-grade quality from our carefully chosen stock.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Key Features:

  • Fossil Type: Ammonite (half specimen)
  • Geological Period: Cretaceous (approx. 145 – 66 million years ago)
  • Origin: Madagascar
  • Preservation: Cut and polished half with visible internal chambers
  • Colour: Brown, beige, and amber tones with natural mineral infill
  • Size: Varies – see photo for scale and details

Scientific Classification:

  • Phylum: Mollusca
  • Class: Cephalopoda
  • Order: Ammonitida
  • Superfamily: Desmoceratoidea (common among Cretaceous Madagascar ammonites)
  • Family: Typically Desmoceratidae or similar depending on specimen
  • Zone/Biozone: Mid-Cretaceous, exact zone may vary
  • Depositional Environment: Shallow marine shelf

Note: Due to wide variability among ammonite species in Madagascar, the precise genus may not be determined unless otherwise labelled.

Ammonites are iconic extinct marine cephalopods that thrived in Earth’s oceans for over 300 million years. Their beautifully spiralled shells and internal chambers make them one of the most recognisable fossils in the world.

Whether you’re a fossil enthusiast, collector, or simply appreciate natural history and geological wonders, this authentic Cretaceous ammonite half from Madagascar makes a stunning addition to any collection.

You will receive an actual specimen of similar quality to the one pictured.

Disclaimer: All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. We do not use stock photos — every listing represents the actual type of item you will receive.

 

Additional information

Weight 50 g
Era

Cretaceous
Origin

Madagascar

Cretaceous Information

The Cretaceous Period (145–66 million years ago) was the final era of the Mesozoic, marked by the dominance of dinosaurs and the rise of flowering plants. It had a warm, greenhouse climate, with high sea levels that created vast shallow inland seas. Marine life flourished, including mosasaurs, ammonites, and rudist reefs, while the land was ruled by iconic dinosaurs like Tyrannosaurus rex, Triceratops, and Spinosaurus. Mammals and birds diversified, and insects thrived. The period ended with the mass extinction event, likely caused by an asteroid impact, wiping out the dinosaurs and paving the way for the rise of mammals in the Cenozoic.

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