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.
Rare Olcostephanus (Olcostephanus) sayni Fossil Ammonite – Lower Hauterivian, Lower Cretaceous, Drôme France – Genuine + COA
£24.00
A rare Olcostephanus (Olcostephanus) sayni Fossil Ammonite, from the Lower Hauterivian Stage of the Lower Cretaceous, collected in Drôme, France. This ammonite is a striking representative of the genus Olcostephanus, noted for its strong ribbing and stratigraphic significance in Early Cretaceous faunas. The fossil pictured is the exact specimen you will receive, supplied with a Certificate of Authenticity.
Fossil Type & Species:
Type: Ammonite (extinct marine cephalopod)
Species:Olcostephanus (Olcostephanus) sayni
Order: Ammonitida
Superfamily: Perisphinctoidea
Family: Olcostephanidae
Geological Context:
Period: Cretaceous
Epoch/Stage: Lower Cretaceous – Lower Hauterivian (approx. 132 to 129 million years ago)
Biozone: Associated with the Sayni Zone, an important ammonite biozone within the Lower Hauterivian
Formation: Hauterivian limestone successions of southeastern France
Depositional Environment: Shallow marine carbonate platform, favourable for ammonite preservation
Locality:
Region: Drôme, France
Morphology & Features:
Evolute shell with moderately wide umbilicus
Strong, simple ribbing continuing across the flanks and ventral area
Graceful whorl structure diagnostic of Olcostephanus (O.) sayni
Excellent preservation of ribbing and shell features
Scientific Notes:
Olcostephanus sayni was first described in the late 19th century during detailed studies of French Cretaceous ammonites
The genus Olcostephanus is an important ammonite taxon widely used in Lower Cretaceous stratigraphy across Europe
Notable Details:
Rare French ammonite from a classic Cretaceous fossil locality
Excellent preservation with visible ribbing and whorl detail
100% genuine, natural fossil – no restoration
Scale Reference: Each square or cube = 1cm. Please see photographs for accurate sizing
Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and professionally curated. Every purchase includes a Certificate of Authenticity. The fossil shown is the exact specimen you will receive.
This Olcostephanus (Olcostephanus) sayni ammonite is a rare and scientifically valuable fossil from the Lower Hauterivian of France – an excellent addition for collectors, researchers, or natural history displays.
A rare Olcostephanus (Olcostephanus) sayni Fossil Ammonite, from the Lower Hauterivian Stage of the Lower Cretaceous, collected in Drôme, France. This ammonite is a striking representative of the genus Olcostephanus, noted for its strong ribbing and stratigraphic significance in Early Cretaceous faunas. The fossil pictured is the exact specimen you will receive, supplied with a Certificate of Authenticity.
Fossil Type & Species:
Type: Ammonite (extinct marine cephalopod)
Species:Olcostephanus (Olcostephanus) sayni
Order: Ammonitida
Superfamily: Perisphinctoidea
Family: Olcostephanidae
Geological Context:
Period: Cretaceous
Epoch/Stage: Lower Cretaceous – Lower Hauterivian (approx. 132 to 129 million years ago)
Biozone: Associated with the Sayni Zone, an important ammonite biozone within the Lower Hauterivian
Formation: Hauterivian limestone successions of southeastern France
Depositional Environment: Shallow marine carbonate platform, favourable for ammonite preservation
Locality:
Region: Drôme, France
Morphology & Features:
Evolute shell with moderately wide umbilicus
Strong, simple ribbing continuing across the flanks and ventral area
Graceful whorl structure diagnostic of Olcostephanus (O.) sayni
Excellent preservation of ribbing and shell features
Scientific Notes:
Olcostephanus sayni was first described in the late 19th century during detailed studies of French Cretaceous ammonites
The genus Olcostephanus is an important ammonite taxon widely used in Lower Cretaceous stratigraphy across Europe
Notable Details:
Rare French ammonite from a classic Cretaceous fossil locality
Excellent preservation with visible ribbing and whorl detail
100% genuine, natural fossil – no restoration
Scale Reference: Each square or cube = 1cm. Please see photographs for accurate sizing
Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and professionally curated. Every purchase includes a Certificate of Authenticity. The fossil shown is the exact specimen you will receive.
This Olcostephanus (Olcostephanus) sayni ammonite is a rare and scientifically valuable fossil from the Lower Hauterivian of France – an excellent addition for collectors, researchers, or natural history displays.
Additional information
Era
Cretaceous
Origin
France
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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