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.

FREE UK DELIVERY - Save up to 60%

SALE 10%
Fossil Ammonite Graphoceras concavum Lioceras Bajocian Jurassic Somerset UK Genuine Specimen
Fossil Ammonite Graphoceras concavum Lioceras Bajocian Jurassic Somerset UK Genuine Specimen - Image 2

Fossil Ammonite Graphoceras concavum Lioceras Bajocian Jurassic Somerset UK Genuine Specimen

Original price was: £36.00.Current price is: £32.40.

This listing features a Graphoceras (Lioceras) concavum fossil ammonite from the Bajocian stage of the Middle Jurassic, collected in Somerset, United Kingdom. This is a scientifically and visually striking ammonite, recognised for its discoidal shell and fine ribbing—an iconic species from classic British Jurassic strata.

  • Fossil Type: Ammonite (extinct marine cephalopod)
  • Genus & Species: Graphoceras (Lioceras) concavum
  • Size: See photo with 1cm scale cube for accurate measurements
  • Geological Period: Jurassic
  • Stage: Bajocian (~170–168 million years ago)
  • Locality: Somerset, England, UK
  • Family: Graphoceratidae
  • Superfamily: Hildoceratoidea
  • Order: Ammonitida
  • Depositional Environment: Shallow marine sea with moderate-energy deposition; fine-grained mudstones and limestones typical of Bajocian successions

Geological & Scientific Significance:

Graphoceras (Lioceras) concavum is a key ammonite species from the Bajocian stage and is widely used as an index fossil. Its occurrence typically defines the Concavum Zone, an important biozone in Jurassic stratigraphy, especially in NW Europe.

These ammonites feature a compressed, discoidal shell with sharp ribbing and a moderately deep umbilicus. The fine suture patterns and involute coiling make this genus a favourite among both academic collectors and fossil enthusiasts.

Somerset is part of the Wessex Basin and has exposures of marine Middle Jurassic sediments that provide a window into a richly diverse palaeoenvironment filled with ammonites, bivalves, and early marine reptiles.

Notable Features:

  • Strong, bifurcating ribbing with slight curvature on flanks
  • Flattened venter with fine suture detail
  • Stratigraphically significant ammonite used in global correlation
  • A classic British Middle Jurassic fossil

Authenticity Guaranteed: All our fossils are 100% genuine specimens. This ammonite comes with a Certificate of Authenticity, confirming its scientific identity and locality.

Photo Disclosure: You will receive the exact specimen shown in the images. Scale cube is 1cm per square to provide accurate sizing.

This Graphoceras (Lioceras) concavum ammonite is a beautifully preserved piece of Jurassic history—perfect for collectors, educators, or anyone passionate about British geological heritage.

(Actual as seen)

Only 1 left in stock

SKU: UF4573 Category:

Description

This listing features a Graphoceras (Lioceras) concavum fossil ammonite from the Bajocian stage of the Middle Jurassic, collected in Somerset, United Kingdom. This is a scientifically and visually striking ammonite, recognised for its discoidal shell and fine ribbing—an iconic species from classic British Jurassic strata.

  • Fossil Type: Ammonite (extinct marine cephalopod)
  • Genus & Species: Graphoceras (Lioceras) concavum
  • Size: See photo with 1cm scale cube for accurate measurements
  • Geological Period: Jurassic
  • Stage: Bajocian (~170–168 million years ago)
  • Locality: Somerset, England, UK
  • Family: Graphoceratidae
  • Superfamily: Hildoceratoidea
  • Order: Ammonitida
  • Depositional Environment: Shallow marine sea with moderate-energy deposition; fine-grained mudstones and limestones typical of Bajocian successions

Geological & Scientific Significance:

Graphoceras (Lioceras) concavum is a key ammonite species from the Bajocian stage and is widely used as an index fossil. Its occurrence typically defines the Concavum Zone, an important biozone in Jurassic stratigraphy, especially in NW Europe.

These ammonites feature a compressed, discoidal shell with sharp ribbing and a moderately deep umbilicus. The fine suture patterns and involute coiling make this genus a favourite among both academic collectors and fossil enthusiasts.

Somerset is part of the Wessex Basin and has exposures of marine Middle Jurassic sediments that provide a window into a richly diverse palaeoenvironment filled with ammonites, bivalves, and early marine reptiles.

Notable Features:

  • Strong, bifurcating ribbing with slight curvature on flanks
  • Flattened venter with fine suture detail
  • Stratigraphically significant ammonite used in global correlation
  • A classic British Middle Jurassic fossil

Authenticity Guaranteed: All our fossils are 100% genuine specimens. This ammonite comes with a Certificate of Authenticity, confirming its scientific identity and locality.

Photo Disclosure: You will receive the exact specimen shown in the images. Scale cube is 1cm per square to provide accurate sizing.

This Graphoceras (Lioceras) concavum ammonite is a beautifully preserved piece of Jurassic history—perfect for collectors, educators, or anyone passionate about British geological heritage.

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.

Reviews

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Related products