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.
This listing features a RARE 6″ fossil ammonite, Calycoceras (Newboldiceras) asiaticum, from the Cenomanian Stage of the Cretaceous Period, found in Madagascar. This striking specimen is part of a carefully selected collection and is an exceptional example of a mid-Cretaceous marine cephalopod, now extinct but well preserved in this fully mineralised fossil.
Geological & Palaeontological Details:
Species: Calycoceras (Newboldiceras) asiaticum
Geological Period: Cretaceous
Geological Stage: Cenomanian (~100.5 to 93.9 million years ago)
Locality: Madagascar
Depositional Environment: Shallow to moderately deep marine shelf, carbonate-rich sediments
Order: Ammonitida
Superfamily: Acanthoceratoidea
Family: Acanthoceratidae
Genus/Subgenus: Calycoceras (Newboldiceras)
Biozone: Commonly associated with the Mantelliceras mantelli and Calycoceras guerangeri zones
Identification: Originally described and refined by Japanese and European palaeontologists working on Cretaceous ammonites of Africa and SE Asia
Morphological Features:
Moderate involute coiling with exposed whorls
Prominent ribbing across the flanks with faint tubercles in younger specimens
Shell sections display internal chamber divisions and mineral infill
Preserved in warm tones with natural calcite crystallisation
Notable Information:
This species offers insight into faunal migrations and diversity of ammonites between the Indo-Madagascan region and Tethyan realm
Frequently used in biostratigraphy of the Cenomanian due to its broad but well-dated occurrence
A display-worthy fossil ideal for collectors, educators, and scientific reference
Authenticity & Presentation:
100% genuine fossil specimen, not a replica
Comes with a Certificate of Authenticity
Photo shows the exact fossil you will receive
Scale cube = 1cm for precise size reference
This 6″ Calycoceras (Newboldiceras) asiaticum ammonite fossil from Madagascar is a beautifully preserved relic of the Cretaceous oceans, making a perfect centrepiece for any collection.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
This listing features a RARE 6″ fossil ammonite, Calycoceras (Newboldiceras) asiaticum, from the Cenomanian Stage of the Cretaceous Period, found in Madagascar. This striking specimen is part of a carefully selected collection and is an exceptional example of a mid-Cretaceous marine cephalopod, now extinct but well preserved in this fully mineralised fossil.
Geological & Palaeontological Details:
Species: Calycoceras (Newboldiceras) asiaticum
Geological Period: Cretaceous
Geological Stage: Cenomanian (~100.5 to 93.9 million years ago)
Locality: Madagascar
Depositional Environment: Shallow to moderately deep marine shelf, carbonate-rich sediments
Order: Ammonitida
Superfamily: Acanthoceratoidea
Family: Acanthoceratidae
Genus/Subgenus: Calycoceras (Newboldiceras)
Biozone: Commonly associated with the Mantelliceras mantelli and Calycoceras guerangeri zones
Identification: Originally described and refined by Japanese and European palaeontologists working on Cretaceous ammonites of Africa and SE Asia
Morphological Features:
Moderate involute coiling with exposed whorls
Prominent ribbing across the flanks with faint tubercles in younger specimens
Shell sections display internal chamber divisions and mineral infill
Preserved in warm tones with natural calcite crystallisation
Notable Information:
This species offers insight into faunal migrations and diversity of ammonites between the Indo-Madagascan region and Tethyan realm
Frequently used in biostratigraphy of the Cenomanian due to its broad but well-dated occurrence
A display-worthy fossil ideal for collectors, educators, and scientific reference
Authenticity & Presentation:
100% genuine fossil specimen, not a replica
Comes with a Certificate of Authenticity
Photo shows the exact fossil you will receive
Scale cube = 1cm for precise size reference
This 6″ Calycoceras (Newboldiceras) asiaticum ammonite fossil from Madagascar is a beautifully preserved relic of the Cretaceous oceans, making a perfect centrepiece for any collection.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
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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