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 Proplanulites koenigi Fossil Ammonite | Lower Callovian Jurassic | Ashton Keynes UK | Certified Authentic Specimen
£36.00
A rare and finely preserved fossil ammonite: Proplanulites koenigi, from the Lower Callovian Stage of the Middle Jurassic, discovered at Ashton Keynes, Wiltshire, United Kingdom. This classic ammonite species represents an important part of the Callovian marine fauna and is a highly desirable addition to any fossil collection.
The specimen shown is the exact fossil you will receive, professionally photographed with a 1cm scale cube for accurate sizing. Please refer to the images for full measurements and condition.
Geological & Palaeontological Information:
Fossil Type: Ammonite
Species:Proplanulites koenigi
Geological Period: Jurassic
Stage: Lower Callovian (~165 to 163 million years ago)
Location: Ashton Keynes, Wiltshire, England, UK
Depositional Environment: Shallow marine, within calcareous mudstones of the Oxford Clay Formation
Order: Ammonitida
Superfamily: Stephanoceratoidea
Family: Stephanoceratidae
Biozone (Inferred):Macrocephalites macrocephalus Zone
Morphological Features:
Moderately involute shell with broad whorls
Faint to strong ribbing depending on growth stage
Compressed cross-section with rounded venter
Well-defined suture patterns
Notable Points:
A key ammonite for Lower Callovian biostratigraphy
Sourced from a historically significant UK locality
Large, display-quality fossil with strong educational value
A rare and finely preserved fossil ammonite: Proplanulites koenigi, from the Lower Callovian Stage of the Middle Jurassic, discovered at Ashton Keynes, Wiltshire, United Kingdom. This classic ammonite species represents an important part of the Callovian marine fauna and is a highly desirable addition to any fossil collection.
The specimen shown is the exact fossil you will receive, professionally photographed with a 1cm scale cube for accurate sizing. Please refer to the images for full measurements and condition.
Geological & Palaeontological Information:
Fossil Type: Ammonite
Species:Proplanulites koenigi
Geological Period: Jurassic
Stage: Lower Callovian (~165 to 163 million years ago)
Location: Ashton Keynes, Wiltshire, England, UK
Depositional Environment: Shallow marine, within calcareous mudstones of the Oxford Clay Formation
Order: Ammonitida
Superfamily: Stephanoceratoidea
Family: Stephanoceratidae
Biozone (Inferred):Macrocephalites macrocephalus Zone
Morphological Features:
Moderately involute shell with broad whorls
Faint to strong ribbing depending on growth stage
Compressed cross-section with rounded venter
Well-defined suture patterns
Notable Points:
A key ammonite for Lower Callovian biostratigraphy
Sourced from a historically significant UK locality
Large, display-quality fossil with strong educational value
Why This Fossil is Special:
Rare ammonite species from the Middle Jurassic
Outstanding preservation and clarity of features
Ethically sourced and 100% genuine
Includes a Certificate of Authenticity
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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