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Rare Fossil Ammonite Dichotomosphinctes antecedens Jurassic Callovian Tulear Madagascar | Authentic Fossil
Rare Fossil Ammonite Dichotomosphinctes antecedens Jurassic Callovian Tulear Madagascar | Authentic Fossil - Image 2

Rare Fossil Ammonite Dichotomosphinctes antecedens Jurassic Callovian Tulear Madagascar | Authentic Fossil

£24.00

This listing features a rare and scientifically valuable fossil of Dichotomosphinctes antecedens, a classic mid-Jurassic ammonite species from the Callovian stage. The specimen originates from the richly fossiliferous marine beds near Tulear, Madagascar, a renowned location for yielding exceptionally preserved Jurassic cephalopods.

Geological Context:

  • Fossil Type: Ammonite (Extinct marine mollusc related to squid and cuttlefish)
  • Species: Dichotomosphinctes antecedens (Spath, 1928)
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Perisphinctidae
  • Geological Stage: Callovian (c. 166.1 to 161.2 million years ago)
  • Formation: Jurassic marine limestones of the Tulear Basin
  • Depositional Environment: Warm, shallow marine shelf with carbonate sedimentation

Ammonites of the genus Dichotomosphinctes are known for their strong ribbing and symmetrical shell forms. D. antecedens represents an earlier evolutionary form within the lineage and is of particular interest for stratigraphic correlation in the southern hemisphere.

Morphology & Notable Features:

  • Evolute shell with exposed inner whorls
  • Characteristic dichotomously branching ribs that cross the flanks and venter
  • Rounded venter with no keel
  • Moderate umbilicus and compressed lateral profile
  • Suture patterns typical of mid-Jurassic perisphinctids

Biozone Association: This species is commonly associated with mid-Callovian ammonite zones and is useful in stratigraphic frameworks for the Indian Ocean and southern Gondwanan regions.

Specimen Details:

  • Origin: Tulear Region, Madagascar
  • Age: Middle to Late Callovian Stage, Jurassic (~163 million years old)
  • Scale: Scale rule square/cube = 1cm. See photo for full sizing
  • Condition: Carefully selected for completeness and preservation
  • Photo: The exact fossil shown in the photograph is what you will receive

Certification & Authenticity: All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. Every piece is chosen for its scientific, educational, and display value.

This rare Dichotomosphinctes antecedens ammonite is an impressive relic from Madagascar’s Jurassic marine deposits—perfect for collectors, educators, and anyone interested in the dynamic history of prehistoric life.

(Actual as seen)

Only 1 left in stock

SKU: UF4360 Category:

Description

This listing features a rare and scientifically valuable fossil of Dichotomosphinctes antecedens, a classic mid-Jurassic ammonite species from the Callovian stage. The specimen originates from the richly fossiliferous marine beds near Tulear, Madagascar, a renowned location for yielding exceptionally preserved Jurassic cephalopods.

Geological Context:

  • Fossil Type: Ammonite (Extinct marine mollusc related to squid and cuttlefish)
  • Species: Dichotomosphinctes antecedens (Spath, 1928)
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Perisphinctidae
  • Geological Stage: Callovian (c. 166.1 to 161.2 million years ago)
  • Formation: Jurassic marine limestones of the Tulear Basin
  • Depositional Environment: Warm, shallow marine shelf with carbonate sedimentation

Ammonites of the genus Dichotomosphinctes are known for their strong ribbing and symmetrical shell forms. D. antecedens represents an earlier evolutionary form within the lineage and is of particular interest for stratigraphic correlation in the southern hemisphere.

Morphology & Notable Features:

  • Evolute shell with exposed inner whorls
  • Characteristic dichotomously branching ribs that cross the flanks and venter
  • Rounded venter with no keel
  • Moderate umbilicus and compressed lateral profile
  • Suture patterns typical of mid-Jurassic perisphinctids

Biozone Association: This species is commonly associated with mid-Callovian ammonite zones and is useful in stratigraphic frameworks for the Indian Ocean and southern Gondwanan regions.

Specimen Details:

  • Origin: Tulear Region, Madagascar
  • Age: Middle to Late Callovian Stage, Jurassic (~163 million years old)
  • Scale: Scale rule square/cube = 1cm. See photo for full sizing
  • Condition: Carefully selected for completeness and preservation
  • Photo: The exact fossil shown in the photograph is what you will receive

Certification & Authenticity: All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. Every piece is chosen for its scientific, educational, and display value.

This rare Dichotomosphinctes antecedens ammonite is an impressive relic from Madagascar’s Jurassic marine deposits—perfect for collectors, educators, and anyone interested in the dynamic history of prehistoric life.

Additional information

Era

Jurassic
Origin

Madagascar

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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