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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DARELLIA recticostata Ammonite Fossil – Upper Toarcian Jurassic, Ravenscar Yorkshire UK

DARELLIA recticostata Ammonite Fossil – Upper Toarcian Jurassic, Ravenscar Yorkshire UK

Original price was: £48.00.Current price is: £43.20.

This listing offers a fine example of the rare ammonite DARELLIA recticostata, collected from the Upper Toarcian Stage of the Jurassic Period at Ravenscar, North Yorkshire, UK. A visually striking and scientifically important fossil, this ammonite represents a classic species from the world-famous Yorkshire coast

Fossil Type & Species:

  • Type: Ammonite (Extinct Marine Cephalopod)
  • Species: Darellia recticostata
  • Known for its distinctive straight ribbing pattern and slender form

Geological Context:

  • Era: Mesozoic
  • Period: Jurassic
  • Stage: Upper Toarcian (~182–174 million years ago)
  • Formation: Likely Whitby Mudstone Formation or Ravenscar Group equivalent
  • Depositional Environment: Low-energy offshore marine basin with fine silt and clay sedimentation; conditions ideal for preservation of complete ammonites and marine vertebrates

Morphological Features:

  • Narrow, planispiral shell with strong, straight ribs (recticostate ornamentation) running across the flanks
  • Involute coiling and compressed whorl section with a relatively small umbilicus
  • Shell surface typically smooth between ribs and often well-preserved in laminated shale

Scientific Importance:

  • Darellia recticostata is a diagnostic species within the Upper Toarcian and is used as a biostratigraphic marker in regional Jurassic zonation
  • Its precise morphology helps define subtle faunal and ecological shifts during the Toarcian oceanic changes, including known anoxic events
  • A key genus for understanding Toarcian ammonite evolution and paleobiogeography

Locality Information:

  • Ravenscar, Yorkshire, UK – one of the richest fossil-producing regions along the Jurassic Coast of England. A designated SSSI (Site of Special Scientific Interest) and part of the North Yorkshire and Cleveland Heritage Coast

Authenticity & Display:

All of our fossils are 100% Genuine Specimens and come with a Certificate of Authenticity. This listing includes photographs of the exact specimen you will receive. Please refer to the image for full sizing – the scale cube = 1cm.

This is a scientifically and visually outstanding ammonite fossil, ideal for collectors of British Jurassic ammonites, educators, or enthusiasts of classic Whitby/Toarcian material.

Own a genuine piece of Yorkshire’s prehistoric seafloor – over 175 million years old!

(Actual as seen)

Only 1 left in stock

SKU: UF3455 Category:

Description

This listing offers a fine example of the rare ammonite DARELLIA recticostata, collected from the Upper Toarcian Stage of the Jurassic Period at Ravenscar, North Yorkshire, UK. A visually striking and scientifically important fossil, this ammonite represents a classic species from the world-famous Yorkshire coast

Fossil Type & Species:

  • Type: Ammonite (Extinct Marine Cephalopod)
  • Species: Darellia recticostata
  • Known for its distinctive straight ribbing pattern and slender form

Geological Context:

  • Era: Mesozoic
  • Period: Jurassic
  • Stage: Upper Toarcian (~182–174 million years ago)
  • Formation: Likely Whitby Mudstone Formation or Ravenscar Group equivalent
  • Depositional Environment: Low-energy offshore marine basin with fine silt and clay sedimentation; conditions ideal for preservation of complete ammonites and marine vertebrates

Morphological Features:

  • Narrow, planispiral shell with strong, straight ribs (recticostate ornamentation) running across the flanks
  • Involute coiling and compressed whorl section with a relatively small umbilicus
  • Shell surface typically smooth between ribs and often well-preserved in laminated shale

Scientific Importance:

  • Darellia recticostata is a diagnostic species within the Upper Toarcian and is used as a biostratigraphic marker in regional Jurassic zonation
  • Its precise morphology helps define subtle faunal and ecological shifts during the Toarcian oceanic changes, including known anoxic events
  • A key genus for understanding Toarcian ammonite evolution and paleobiogeography

Locality Information:

  • Ravenscar, Yorkshire, UK – one of the richest fossil-producing regions along the Jurassic Coast of England. A designated SSSI (Site of Special Scientific Interest) and part of the North Yorkshire and Cleveland Heritage Coast

Authenticity & Display:

All of our fossils are 100% Genuine Specimens and come with a Certificate of Authenticity. This listing includes photographs of the exact specimen you will receive. Please refer to the image for full sizing – the scale cube = 1cm.

This is a scientifically and visually outstanding ammonite fossil, ideal for collectors of British Jurassic ammonites, educators, or enthusiasts of classic Whitby/Toarcian material.

Own a genuine piece of Yorkshire’s prehistoric seafloor – over 175 million years old!

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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