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RARE 6" Sonninia (Euhoploceras) mudestum Fossil Ammonite – Concavum Zone, Middle Bajocian, Jurassic – Dorset UK – Alice Purnell Collection
RARE 6" Sonninia (Euhoploceras) mudestum Fossil Ammonite – Concavum Zone, Middle Bajocian, Jurassic – Dorset UK – Alice Purnell Collection - Image 2

RARE 6″ Sonninia (Euhoploceras) mudestum Fossil Ammonite – Concavum Zone, Middle Bajocian, Jurassic – Dorset UK – Alice Purnell Collection

£120.00

A scientifically important and beautifully preserved 6-inch specimen of Sonninia (Euhoploceras) mudestum, a rare ammonite from the Concavum Zone of the Middle Bajocian Stage, found at Bradford Abbas, Dorset, United Kingdom. This authentic fossil comes from the esteemed Alice Purnell Collection, and the specimen shown in the photo is the exact piece you will receive.

Geological Context:

  • Species: Sonninia (Euhoploceras) mudestum
  • Geological Period: Jurassic
  • Stage: Middle Bajocian (~170 to 168 million years ago)
  • Biozone: Concavum Zone
  • Location: Bradford Abbas, Dorset, UK
  • Depositional Environment: Open marine shelf with fine-grained calcareous sediments, deposited in a temperate, moderately deep sea environment during a stable transgressive phase of the Jurassic

Taxonomic Classification:

  • Family: Sonniniidae
  • Subgenus: Euhoploceras
  • Superfamily: Hildoceratoidea
  • Order: Ammonitida
  • Suborder: Ammonitina
  • Formally Described By: Buckman (early 20th century)

Morphological Features:

Sonninia (Euhoploceras) mudestum displays a moderately evolute shell with strong, thick ribs that may bifurcate or trifurcate mid-flank, extending across the venter. The ribbing is coarse and evenly spaced, giving the shell a robust and sculpted appearance. The umbilicus is open but not excessively wide. This particular subgenus, Euhoploceras, is characterised by its dense ribbing and sturdy, rounded whorl section.

This fossil exhibits all these key features with excellent preservation of detail and shell architecture, making it a reference specimen for collectors and researchers alike.

Stratigraphic and Scientific Significance:

This species is zonally diagnostic of the Concavum Zone and represents a key component of Middle Jurassic ammonite faunas from southern England. Sonninia species are critical for refining the ammonite biostratigraphy of the Bajocian and for understanding evolutionary transitions within the Sonniniidae family. The genus is also of palaeobiogeographic interest, marking faunal links across the Western Tethyan realm.

Additional Details:

  • All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
  • Scale Rule Squares / Cube = 1cm. Please refer to the listing photo for full specimen dimensions.
  • This ammonite is part of the scientifically documented Alice Purnell Collection.

This rare Sonninia (Euhoploceras) mudestum ammonite is a premium addition for any collector of British Jurassic fossils or anyone fascinated by the evolutionary story of ancient marine ecosystems.

Secure this beautiful and scientifically meaningful specimen today.

(Actual as seen)

Out of stock

SKU: AF1257 Category:

Description

A scientifically important and beautifully preserved 6-inch specimen of Sonninia (Euhoploceras) mudestum, a rare ammonite from the Concavum Zone of the Middle Bajocian Stage, found at Bradford Abbas, Dorset, United Kingdom. This authentic fossil comes from the esteemed Alice Purnell Collection, and the specimen shown in the photo is the exact piece you will receive.

Geological Context:

  • Species: Sonninia (Euhoploceras) mudestum
  • Geological Period: Jurassic
  • Stage: Middle Bajocian (~170 to 168 million years ago)
  • Biozone: Concavum Zone
  • Location: Bradford Abbas, Dorset, UK
  • Depositional Environment: Open marine shelf with fine-grained calcareous sediments, deposited in a temperate, moderately deep sea environment during a stable transgressive phase of the Jurassic

Taxonomic Classification:

  • Family: Sonniniidae
  • Subgenus: Euhoploceras
  • Superfamily: Hildoceratoidea
  • Order: Ammonitida
  • Suborder: Ammonitina
  • Formally Described By: Buckman (early 20th century)

Morphological Features:

Sonninia (Euhoploceras) mudestum displays a moderately evolute shell with strong, thick ribs that may bifurcate or trifurcate mid-flank, extending across the venter. The ribbing is coarse and evenly spaced, giving the shell a robust and sculpted appearance. The umbilicus is open but not excessively wide. This particular subgenus, Euhoploceras, is characterised by its dense ribbing and sturdy, rounded whorl section.

This fossil exhibits all these key features with excellent preservation of detail and shell architecture, making it a reference specimen for collectors and researchers alike.

Stratigraphic and Scientific Significance:

This species is zonally diagnostic of the Concavum Zone and represents a key component of Middle Jurassic ammonite faunas from southern England. Sonninia species are critical for refining the ammonite biostratigraphy of the Bajocian and for understanding evolutionary transitions within the Sonniniidae family. The genus is also of palaeobiogeographic interest, marking faunal links across the Western Tethyan realm.

Additional Details:

  • All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
  • Scale Rule Squares / Cube = 1cm. Please refer to the listing photo for full specimen dimensions.
  • This ammonite is part of the scientifically documented Alice Purnell Collection.

This rare Sonninia (Euhoploceras) mudestum ammonite is a premium addition for any collector of British Jurassic fossils or anyone fascinated by the evolutionary story of ancient marine ecosystems.

Secure this beautiful and scientifically meaningful specimen today.

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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