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Rare Homoeoplanulites difficilis Fossil Ammonite, Jurassic, Lower Callovian, Waterpark UK, Genuine with COA
Rare Homoeoplanulites difficilis Fossil Ammonite, Jurassic, Lower Callovian, Waterpark UK, Genuine with COA - Image 2

Rare Homoeoplanulites difficilis Fossil Ammonite, Jurassic, Lower Callovian, Waterpark UK, Genuine with COA

£43.20

This listing features a RARE Fossil Ammonite of Homoeoplanulites difficilis from the Lower Callovian Stage of the Jurassic Period, found in the classic fossil-rich deposits of Waterpark, Ashton Keynes, United Kingdom. This location is known for yielding well-preserved ammonite faunas that are critical to understanding Middle Jurassic biostratigraphy.

The specimen shown in the photographs is the exact fossil you will receive, professionally cleaned and chosen for its distinct features.

Scale Rule Squares / Cube = 1cm — please see the photographs for accurate full sizing and detail.

Key Geological and Scientific Information:

  • Species: Homoeoplanulites difficilis
  • Fossil Type: Ammonite (extinct marine cephalopod)
  • Geological Period: Jurassic
  • Geological Stage: Lower Callovian (approx. 164 million years ago)
  • Location: Waterpark, Ashton Keynes, Wiltshire, England, UK
  • Formation: Likely part of the Kellaways Beds or transitional Callovian marine silts
  • Order: Ammonitida
  • Superfamily: Haploceratoidea
  • Family: Tulitidae or related (taxonomy under discussion)
  • Described By: S.S. Buckman (early 20th century)

Morphology Features:

Homoeoplanulites difficilis is a distinctive ammonite featuring a flattened shell profile with narrow, gently involute whorls, often with faint or subdued ribbing and a moderately rounded venter. As its name implies, the species can be taxonomically “difficult” due to its transitional morphology between other Haploceratid genera. The fossil here displays those features clearly, including compressed flanks and subtle but characteristic ribbing.

Depositional Environment:

The fossil was deposited in a low-energy offshore marine setting within fine-grained clay and silt, typical of the Kellaways Beds or equivalent strata. These marine sediments are ideal for preserving ammonites with delicate shell features.

Stratigraphy & Biozone Context:

Homoeoplanulites difficilis is found in Lower Callovian strata and is often associated with ammonites from the Kepplerites galilaeii Zone, helping define biostratigraphic intervals within southern Britain. Its occurrence supports detailed correlation between sites across the European Jurassic marine realm.

Scientific Relevance:

This genus represents a transitional stage in the evolution of Callovian ammonites, helping researchers understand diversification and adaptation trends among Haploceratids. Its rarity in the fossil record, combined with its evolutionary interest, makes this a desirable specimen for collectors and researchers alike.

Authenticity Guarantee:

All of our fossils are 100% genuine specimens, responsibly sourced, cleaned, and identified. Every specimen comes with a Certificate of Authenticity, documenting the species, age, and find location.

This Homoeoplanulites difficilis fossil is a rare and valuable addition to any fossil collection — perfect for academic collections, enthusiasts of Jurassic paleontology, or anyone seeking an authentic piece of natural history.

(Actual as seen)

Only 1 left in stock

SKU: UF4427 Category:

Description

This listing features a RARE Fossil Ammonite of Homoeoplanulites difficilis from the Lower Callovian Stage of the Jurassic Period, found in the classic fossil-rich deposits of Waterpark, Ashton Keynes, United Kingdom. This location is known for yielding well-preserved ammonite faunas that are critical to understanding Middle Jurassic biostratigraphy.

The specimen shown in the photographs is the exact fossil you will receive, professionally cleaned and chosen for its distinct features.

Scale Rule Squares / Cube = 1cm — please see the photographs for accurate full sizing and detail.

Key Geological and Scientific Information:

  • Species: Homoeoplanulites difficilis
  • Fossil Type: Ammonite (extinct marine cephalopod)
  • Geological Period: Jurassic
  • Geological Stage: Lower Callovian (approx. 164 million years ago)
  • Location: Waterpark, Ashton Keynes, Wiltshire, England, UK
  • Formation: Likely part of the Kellaways Beds or transitional Callovian marine silts
  • Order: Ammonitida
  • Superfamily: Haploceratoidea
  • Family: Tulitidae or related (taxonomy under discussion)
  • Described By: S.S. Buckman (early 20th century)

Morphology Features:

Homoeoplanulites difficilis is a distinctive ammonite featuring a flattened shell profile with narrow, gently involute whorls, often with faint or subdued ribbing and a moderately rounded venter. As its name implies, the species can be taxonomically “difficult” due to its transitional morphology between other Haploceratid genera. The fossil here displays those features clearly, including compressed flanks and subtle but characteristic ribbing.

Depositional Environment:

The fossil was deposited in a low-energy offshore marine setting within fine-grained clay and silt, typical of the Kellaways Beds or equivalent strata. These marine sediments are ideal for preserving ammonites with delicate shell features.

Stratigraphy & Biozone Context:

Homoeoplanulites difficilis is found in Lower Callovian strata and is often associated with ammonites from the Kepplerites galilaeii Zone, helping define biostratigraphic intervals within southern Britain. Its occurrence supports detailed correlation between sites across the European Jurassic marine realm.

Scientific Relevance:

This genus represents a transitional stage in the evolution of Callovian ammonites, helping researchers understand diversification and adaptation trends among Haploceratids. Its rarity in the fossil record, combined with its evolutionary interest, makes this a desirable specimen for collectors and researchers alike.

Authenticity Guarantee:

All of our fossils are 100% genuine specimens, responsibly sourced, cleaned, and identified. Every specimen comes with a Certificate of Authenticity, documenting the species, age, and find location.

This Homoeoplanulites difficilis fossil is a rare and valuable addition to any fossil collection — perfect for academic collections, enthusiasts of Jurassic paleontology, or anyone seeking an authentic piece of natural history.

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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