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 Costileioceras sinoni Fossil Ammonite | Aalenian Jurassic | France | Genuine Specimen with COA

Name: Rare Costileioceras sinoni Fossil Ammonite | Aalenian Jurassic | France | Genuine Specimen with COA
Brand: SilverGeo
SKU: UF4346
Availability: OutOfStock

£24.00

This listing is for a Rare Fossil Ammonite (Costileioceras sinoni) from the Aalenian Stage of the Middle Jurassic, discovered in France.

100% Genuine Fossil Specimen – All of our fossils are authentic and come with a Certificate of Authenticity.

Exact Specimen Shown – The photos provided are of the actual fossil you will receive.

Scale for Reference – Scale rule squares/cube = 1cm. Please see photos for full sizing.

Geological & Scientific Details:

Fossil Type: Ammonite (extinct marine mollusc, related to squid and octopus).
Species: Costileioceras sinoni.
Order: Ammonitida.
Superfamily: Stephanoceratoidea.
Family: Stephanoceratidae.
Geological Period: Jurassic.
Stage/Age: Aalenian (approx. 174 – 170 million years ago).
Locality: France.

Notable Features & Morphology:

Shell Form: Moderately involute with strongly ribbed ornamentation.
Ribs: Prominent, branching ribs crossing the flanks, typical of Costileioceras.
Whorl Section: Sub-quadrate with a slightly compressed form.
Size: A well-preserved and rare specimen, making it a desirable collector’s piece.

Depositional Environment:

During the Aalenian, the region that is now France was covered by shallow, warm seas with carbonate-rich sediments. These marine conditions created excellent preservation potential for ammonites and other marine organisms.

Scientific & Collecting Importance:

Costileioceras sinoni is an important ammonite for biostratigraphic correlation within the Aalenian. Its distinctive ribbed shell makes it highly recognisable and useful as a zone fossil, adding both scientific and collector value.

Why Buy This Fossil?

A rare ammonite species from the Aalenian of France.
Excellent preservation with strong ribbing and diagnostic features.
An important specimen for collectors of Jurassic ammonites or European fossil material.
Supplied with a Certificate of Authenticity guaranteeing its provenance.

All of our fossils are responsibly sourced, carefully prepared, and chosen for quality.

(Actual as seen)

Out of stock

SKU: UF4346 Category: Sold Gallery

Description

This listing is for a Rare Fossil Ammonite (Costileioceras sinoni) from the Aalenian Stage of the Middle Jurassic, discovered in France.

100% Genuine Fossil Specimen – All of our fossils are authentic and come with a Certificate of Authenticity.

Exact Specimen Shown – The photos provided are of the actual fossil you will receive.

Scale for Reference – Scale rule squares/cube = 1cm. Please see photos for full sizing.

Geological & Scientific Details:

Fossil Type: Ammonite (extinct marine mollusc, related to squid and octopus).
Species: Costileioceras sinoni.
Order: Ammonitida.
Superfamily: Stephanoceratoidea.
Family: Stephanoceratidae.
Geological Period: Jurassic.
Stage/Age: Aalenian (approx. 174 – 170 million years ago).
Locality: France.

Notable Features & Morphology:

Shell Form: Moderately involute with strongly ribbed ornamentation.
Ribs: Prominent, branching ribs crossing the flanks, typical of Costileioceras.
Whorl Section: Sub-quadrate with a slightly compressed form.
Size: A well-preserved and rare specimen, making it a desirable collector’s piece.

Depositional Environment:

Scientific & Collecting Importance:

Why Buy This Fossil?

A rare ammonite species from the Aalenian of France.
Excellent preservation with strong ribbing and diagnostic features.
An important specimen for collectors of Jurassic ammonites or European fossil material.
Supplied with a Certificate of Authenticity guaranteeing its provenance.

All of our fossils are responsibly sourced, carefully prepared, and chosen for quality.

Additional information

Era	Jurassic
Origin	France

Jurassic Information

The Jurassic Period (201–145 million years ago) was the golden age of dinosaurs, with iconic species like Brachiosaurus, Stegosaurus, and Allosaurus dominating the land. It was a time of warm, humid climates, with high sea levels that created vast shallow seas, supporting abundant marine reptiles, ammonites, and early coral reefs. The first birds, such as Archaeopteryx, evolved from small theropod dinosaurs, while early mammals remained small and nocturnal. Lush forests of cycads, conifers, and ferns covered the land, providing food for giant herbivores. The breakup of the supercontinent Pangaea accelerated, shaping Earth's geography and setting the stage for the diverse ecosystems of the Cretaceous.

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Rare Costileioceras sinoni Fossil Ammonite | Aalenian Jurassic | France | Genuine Specimen with COA

Geological & Scientific Details:

Notable Features & Morphology:

Depositional Environment:

Scientific & Collecting Importance:

Description

Geological & Scientific Details:

Notable Features & Morphology:

Depositional Environment:

Scientific & Collecting Importance:

Additional information

Jurassic Information

Reviews

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