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RARE Argonauticeras argonautus Fossil Ammonite | Aptian Cretaceous | Madagascar | Authentic Specimen with COA
RARE Argonauticeras argonautus Fossil Ammonite | Aptian Cretaceous | Madagascar | Authentic Specimen with COA - Image 2

RARE Argonauticeras argonautus Fossil Ammonite | Aptian Cretaceous | Madagascar | Authentic Specimen with COA

£24.00

Available here is a RARE and visually striking fossil ammonite of the species Argonauticeras argonautus, sourced from Madagascar and dating to the Aptian stage of the Early Cretaceous period (approximately 125 to 113 million years ago). This exceptional ammonite specimen is highly desirable due to its evolutionary and geographic significance, and displays classic morphological traits.

You will receive the exact fossil pictured, accompanied by a 1cm scale cube in the photo for precise sizing. This is a 100% genuine fossil and is supplied with a Certificate of Authenticity.

Geological & Scientific Information:

  • Species: Argonauticeras argonautus
  • Type: Fossil Ammonite (extinct marine cephalopod)
  • Geological Period: Cretaceous
  • Stage: Aptian (approx. 125–113 million years ago)
  • Location Found: Madagascar
  • Order: Ammonitida
  • Superfamily: Desmoceratoidea
  • Family: Douvilleiceratidae
  • Morphological Features: Argonauticeras is recognised for its evolute shell, broad whorls, and fine ribbing extending radially from the umbilicus. The ribs may form subtle nodes and undulations that are distinctive for this genus. This specimen displays excellent preservation, with pronounced suture patterns and intact surface detail.
  • Depositional Environment: Likely deposited in a shallow marine shelf setting, where calcareous mud and sediment aided fossil preservation. The region that is now Madagascar was part of the ancient Gondwanan landmass during the Cretaceous, contributing to unique ammonite faunal assemblages.
  • Notable: Argonauticeras species are notable for their unique shell ornamentation and are occasionally used in biostratigraphic correlation in southern hemisphere Cretaceous deposits.

Additional Notes:

Argonauticeras ammonites are increasingly rare on the market, especially in such well-preserved condition. This fossil is ideal for collectors of Cretaceous ammonites, paleontologists, or anyone seeking a display-worthy piece of Madagascar’s prehistoric marine life.

Why Buy From Us?

  • 100% authentic fossils with accurate identification
  • Includes a Certificate of Authenticity
  • You receive the exact fossil pictured
  • Perfect for education, collection, or display

Add this rare and beautiful Argonauticeras argonautus ammonite fossil to your collection and own a genuine piece of Early Cretaceous history from Madagascar!

(Actual as seen)

Only 1 left in stock

SKU: UF3829 Category:

Description

Available here is a RARE and visually striking fossil ammonite of the species Argonauticeras argonautus, sourced from Madagascar and dating to the Aptian stage of the Early Cretaceous period (approximately 125 to 113 million years ago). This exceptional ammonite specimen is highly desirable due to its evolutionary and geographic significance, and displays classic morphological traits.

You will receive the exact fossil pictured, accompanied by a 1cm scale cube in the photo for precise sizing. This is a 100% genuine fossil and is supplied with a Certificate of Authenticity.

Geological & Scientific Information:

  • Species: Argonauticeras argonautus
  • Type: Fossil Ammonite (extinct marine cephalopod)
  • Geological Period: Cretaceous
  • Stage: Aptian (approx. 125–113 million years ago)
  • Location Found: Madagascar
  • Order: Ammonitida
  • Superfamily: Desmoceratoidea
  • Family: Douvilleiceratidae
  • Morphological Features: Argonauticeras is recognised for its evolute shell, broad whorls, and fine ribbing extending radially from the umbilicus. The ribs may form subtle nodes and undulations that are distinctive for this genus. This specimen displays excellent preservation, with pronounced suture patterns and intact surface detail.
  • Depositional Environment: Likely deposited in a shallow marine shelf setting, where calcareous mud and sediment aided fossil preservation. The region that is now Madagascar was part of the ancient Gondwanan landmass during the Cretaceous, contributing to unique ammonite faunal assemblages.
  • Notable: Argonauticeras species are notable for their unique shell ornamentation and are occasionally used in biostratigraphic correlation in southern hemisphere Cretaceous deposits.

Additional Notes:

Argonauticeras ammonites are increasingly rare on the market, especially in such well-preserved condition. This fossil is ideal for collectors of Cretaceous ammonites, paleontologists, or anyone seeking a display-worthy piece of Madagascar’s prehistoric marine life.

Why Buy From Us?

  • 100% authentic fossils with accurate identification
  • Includes a Certificate of Authenticity
  • You receive the exact fossil pictured
  • Perfect for education, collection, or display

Add this rare and beautiful Argonauticeras argonautus ammonite fossil to your collection and own a genuine piece of Early Cretaceous history from Madagascar!

Additional information

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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