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 10″ Pseudasteroceras stellaformis Fossil Ammonite | Sinemurian Jurassic | Robin Hood’s Bay Yorkshire UK | Certified Authentic Specimen
£240.00
An extraordinary and rare 10-inch fossil ammonite: Pseudasteroceras stellaformis from the Sinemurian Stage of the Early Jurassic, collected from the iconic coastal exposures at Robin Hood’s Bay, Yorkshire Coast, United Kingdom. This beautifully preserved and large specimen showcases the stunning ribbed architecture typical of this genus and represents a key faunal element in Lower Jurassic stratigraphy.
This listing features the exact specimen shown in the photographs. A 1cm scale cube is included for accurate size reference—please see the images for full detail and dimensions.
Geological & Palaeontological Information:
Fossil Type: Ammonite
Species:Pseudasteroceras stellaformis (first described by Fucini, later associated with early Sinemurian faunas)
Geological Period: Jurassic
Stage: Sinemurian (~199 to 190 million years ago)
Location: Robin Hood’s Bay, Yorkshire Coast, England, UK
Depositional Environment: Marine shelf with alternating mudstones and shales from the Lower Lias Formation
Order: Ammonitida
Superfamily: Eoderoceratoidea
Family: Arietitidae
Biozone (Inferred): Possibly within the Bucklandi or Obtusum Zone of the Lower Sinemurian, common in Robin Hood’s Bay stratigraphy
Morphological Features:
Large evolute shell with strongly ribbed, ornamented flanks
Deep umbilicus and pronounced, bifurcating ribs
Slightly keeled venter or smooth ventral band
Dramatic spiral structure ideal for display and stratigraphic reference
Notable Points:
Pseudasteroceras stellaformis is a rare species, particularly in large, complete form
Robin Hood’s Bay is one of the most significant Lower Jurassic fossil sites in the world
Specimens from this site are important for understanding ammonite evolution and regional biostratigraphy
Why This Fossil is Exceptional:
Rare large ammonite from a scientifically important locality
Excellent preservation, size, and aesthetic display value
Ethically sourced and supplied with a Certificate of Authenticity
Perfect for collectors, educators, museums, or natural history displays
An extraordinary and rare 10-inch fossil ammonite: Pseudasteroceras stellaformis from the Sinemurian Stage of the Early Jurassic, collected from the iconic coastal exposures at Robin Hood’s Bay, Yorkshire Coast, United Kingdom. This beautifully preserved and large specimen showcases the stunning ribbed architecture typical of this genus and represents a key faunal element in Lower Jurassic stratigraphy.
This listing features the exact specimen shown in the photographs. A 1cm scale cube is included for accurate size reference—please see the images for full detail and dimensions.
Geological & Palaeontological Information:
Fossil Type: Ammonite
Species:Pseudasteroceras stellaformis (first described by Fucini, later associated with early Sinemurian faunas)
Geological Period: Jurassic
Stage: Sinemurian (~199 to 190 million years ago)
Location: Robin Hood’s Bay, Yorkshire Coast, England, UK
Depositional Environment: Marine shelf with alternating mudstones and shales from the Lower Lias Formation
Order: Ammonitida
Superfamily: Eoderoceratoidea
Family: Arietitidae
Biozone (Inferred): Possibly within the Bucklandi or Obtusum Zone of the Lower Sinemurian, common in Robin Hood’s Bay stratigraphy
Morphological Features:
Large evolute shell with strongly ribbed, ornamented flanks
Deep umbilicus and pronounced, bifurcating ribs
Slightly keeled venter or smooth ventral band
Dramatic spiral structure ideal for display and stratigraphic reference
Notable Points:
Pseudasteroceras stellaformis is a rare species, particularly in large, complete form
Robin Hood’s Bay is one of the most significant Lower Jurassic fossil sites in the world
Specimens from this site are important for understanding ammonite evolution and regional biostratigraphy
Why This Fossil is Exceptional:
Rare large ammonite from a scientifically important locality
Excellent preservation, size, and aesthetic display value
Ethically sourced and supplied with a Certificate of Authenticity
Perfect for collectors, educators, museums, or natural history displays
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.
To provide the best experiences, we use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us to process data such as browsing behavior or unique IDs on this site. Not consenting or withdrawing consent, may adversely affect certain features and functions.
Functional
Always active
The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.
Preferences
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
Statistics
The technical storage or access that is used exclusively for statistical purposes.The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.
Marketing
The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.
Reviews
There are no reviews yet.