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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Arnioceras semicostatum Ammonite Fossil – Lower Sinemurian Jurassic – Yorkshire UK – Certificate of Authenticity
Arnioceras semicostatum Ammonite Fossil – Lower Sinemurian Jurassic – Yorkshire UK – Certificate of Authenticity - Image 2
Arnioceras semicostatum Ammonite Fossil – Lower Sinemurian Jurassic – Yorkshire UK – Certificate of Authenticity - Image 3

Arnioceras semicostatum Ammonite Fossil – Lower Sinemurian Jurassic – Yorkshire UK – Certificate of Authenticity

£48.00

Offered for sale is a well-preserved specimen of Arnioceras semicostatum, a classic Lower Jurassic ammonite fossil from Yorkshire, United Kingdom. This species comes from the Lower Sinemurian stage of the Jurassic period, dating to approximately 199 to 196 million years ago.

The ammonite displays the typical evolute coiling and semi-costate ribbing for which Arnioceras is well known. These features make it an excellent example of an extinct marine cephalopod that once thrived in the warm shallow seas that covered much of present-day Britain during the Early Jurassic.

This fossil is part of the Alice Purnell Collection, known for its high-quality and scientifically curated specimens. The photo shows the exact fossil you will receive, selected for its preservation and natural detail.

Geological and Species Details:

  • Species: Arnioceras semicostatum
  • Type: Ammonite (extinct marine cephalopod)
  • Geological Age: Lower Jurassic, Sinemurian Stage
  • Formation: Lower Lias
  • Locality: Yorkshire, United Kingdom

Key Features:

  • 100% genuine fossil – includes a Certificate of Authenticity
  • Collected from a classic Lower Jurassic site in Yorkshire
  • From the Alice Purnell Collection
  • A scientifically significant and visually attractive display specimen
  • Scale cube/squares = 1cm – full sizing available in the photo

Arnioceras semicostatum is a biostratigraphically important ammonite species and a beautiful example of Jurassic marine life. Specimens like this are excellent additions to any fossil collection, educational display, or natural history exhibit.

Don’t miss the chance to own an authentic piece of Britain’s ancient seas—secure this Arnioceras semicostatum ammonite fossil today.

(Actual as seen)

Out of stock

SKU: AF2049 Category:

Description

Offered for sale is a well-preserved specimen of Arnioceras semicostatum, a classic Lower Jurassic ammonite fossil from Yorkshire, United Kingdom. This species comes from the Lower Sinemurian stage of the Jurassic period, dating to approximately 199 to 196 million years ago.

The ammonite displays the typical evolute coiling and semi-costate ribbing for which Arnioceras is well known. These features make it an excellent example of an extinct marine cephalopod that once thrived in the warm shallow seas that covered much of present-day Britain during the Early Jurassic.

This fossil is part of the Alice Purnell Collection, known for its high-quality and scientifically curated specimens. The photo shows the exact fossil you will receive, selected for its preservation and natural detail.

Geological and Species Details:

  • Species: Arnioceras semicostatum
  • Type: Ammonite (extinct marine cephalopod)
  • Geological Age: Lower Jurassic, Sinemurian Stage
  • Formation: Lower Lias
  • Locality: Yorkshire, United Kingdom

Key Features:

  • 100% genuine fossil – includes a Certificate of Authenticity
  • Collected from a classic Lower Jurassic site in Yorkshire
  • From the Alice Purnell Collection
  • A scientifically significant and visually attractive display specimen
  • Scale cube/squares = 1cm – full sizing available in the photo

Arnioceras semicostatum is a biostratigraphically important ammonite species and a beautiful example of Jurassic marine life. Specimens like this are excellent additions to any fossil collection, educational display, or natural history exhibit.

Don’t miss the chance to own an authentic piece of Britain’s ancient seas—secure this Arnioceras semicostatum ammonite fossil today.

Additional information

Era

Jurassic
Origin

United Kingdom

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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