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RARE Heteromorph Ammonites: Polyptychoceras, Gaudryceras, Tetragonites | Turonian Cretaceous Fossils | Saku Japan | Genuine Specimen w/ COA
RARE Heteromorph Ammonites: Polyptychoceras, Gaudryceras, Tetragonites | Turonian Cretaceous Fossils | Saku Japan | Genuine Specimen w/ COA - Image 2
RARE Heteromorph Ammonites: Polyptychoceras, Gaudryceras, Tetragonites | Turonian Cretaceous Fossils | Saku Japan | Genuine Specimen w/ COA - Image 3
RARE Heteromorph Ammonites: Polyptychoceras, Gaudryceras, Tetragonites | Turonian Cretaceous Fossils | Saku Japan | Genuine Specimen w/ COA - Image 4

RARE Heteromorph Ammonites: Polyptychoceras, Gaudryceras, Tetragonites | Turonian Cretaceous Fossils | Saku Japan | Genuine Specimen w/ COA

Original price was: £1,440.00.Current price is: £1,296.00.

Explore a fascinating triad of rare heteromorph ammonite fossils from the Turonian stage of the Upper Cretaceous period, collected in Saku, Japan. This scientifically important specimen features:

  • Polyptychoceras obstrictum
  • Gaudryceras tenuiliratum
  • Tetragonites glabrus.

Each species presents unique morphology, reflecting evolutionary adaptations and diverse marine life in the ancient seas of what is now Japan. This is a 100% genuine fossil specimen, hand-selected and sold with a Certificate of Authenticity. A photo of the exact piece is included, with a 1cm scale cube for accurate sizing—please refer to the image for full dimensions.

Geological & Scientific Details:

  • Species: Polyptychoceras obstrictum, Gaudryceras tenuiliratum, Tetragonites glabrus
  • Type: Fossil Ammonites (Heteromorph and planispiral forms)
  • Geological Period: Cretaceous
  • Stage: Turonian (approx. 93.9 to 89.8 million years ago)
  • Location: Saku, Nagano Prefecture, Japan
  • Order: Ammonitida
  • Superfamilies:
  • Polyptychoceras: Turrilitoidea
  • Gaudryceras and Tetragonites: Desmoceratoidea
  • Families:
  • Polyptychoceratidae (Polyptychoceras)
  • Gaudryceratidae (Gaudryceras)
  • Tetragonitidae (Tetragonites)
  • Morphological Features:
  • Polyptychoceras obstrictum exhibits a loosely coiled, tubular heteromorph shape with periodic constrictions.
  • Gaudryceras tenuiliratum features compressed, involute planispiral shells with fine ribbing.
  • Tetragonites glabrus is noted for its smooth, nearly unornamented whorls and rounded shell cross-section
  • Depositional Environment: Marine outer shelf to upper slope environments, with fine-grained sedimentation ideal for fossilisation. The region was part of the Northwestern Pacific margin of the Cretaceous Ocean.
  • Scientific Importance: These genera represent key taxa for biostratigraphic correlation across East Asia and the Pacific realm. They serve as excellent index fossils for the Turonian.

Additional Notes:

This triple-ammonite grouping captures the diversity of Cretaceous cephalopods and is an exceptional example of preservation and morphological contrast. Fossils from Saku, Japan are prized for their rarity, clarity, and scientific value.

Why Choose Our Fossils?

  • 100% authentic specimens, backed by expertise.
  • Includes a Certificate of Authenticity.
  • You receive the exact item photographed.
  • Ideal for collectors, educators, and natural history enthusiasts.

Own a remarkable fossil grouping showcasing the evolutionary diversity of ammonites from the Cretaceous seas of Japan. A true collector’s treasure!

(Actual as seen)

Only 1 left in stock

SKU: AF2051 Categories: ,

Description

Explore a fascinating triad of rare heteromorph ammonite fossils from the Turonian stage of the Upper Cretaceous period, collected in Saku, Japan. This scientifically important specimen features:

  • Polyptychoceras obstrictum
  • Gaudryceras tenuiliratum
  • Tetragonites glabrus.

Each species presents unique morphology, reflecting evolutionary adaptations and diverse marine life in the ancient seas of what is now Japan. This is a 100% genuine fossil specimen, hand-selected and sold with a Certificate of Authenticity. A photo of the exact piece is included, with a 1cm scale cube for accurate sizing—please refer to the image for full dimensions.

Geological & Scientific Details:

  • Species: Polyptychoceras obstrictum, Gaudryceras tenuiliratum, Tetragonites glabrus
  • Type: Fossil Ammonites (Heteromorph and planispiral forms)
  • Geological Period: Cretaceous
  • Stage: Turonian (approx. 93.9 to 89.8 million years ago)
  • Location: Saku, Nagano Prefecture, Japan
  • Order: Ammonitida
  • Superfamilies:
  • Polyptychoceras: Turrilitoidea
  • Gaudryceras and Tetragonites: Desmoceratoidea
  • Families:
  • Polyptychoceratidae (Polyptychoceras)
  • Gaudryceratidae (Gaudryceras)
  • Tetragonitidae (Tetragonites)
  • Morphological Features:
  • Polyptychoceras obstrictum exhibits a loosely coiled, tubular heteromorph shape with periodic constrictions.
  • Gaudryceras tenuiliratum features compressed, involute planispiral shells with fine ribbing.
  • Tetragonites glabrus is noted for its smooth, nearly unornamented whorls and rounded shell cross-section
  • Depositional Environment: Marine outer shelf to upper slope environments, with fine-grained sedimentation ideal for fossilisation. The region was part of the Northwestern Pacific margin of the Cretaceous Ocean.
  • Scientific Importance: These genera represent key taxa for biostratigraphic correlation across East Asia and the Pacific realm. They serve as excellent index fossils for the Turonian.

Additional Notes:

This triple-ammonite grouping captures the diversity of Cretaceous cephalopods and is an exceptional example of preservation and morphological contrast. Fossils from Saku, Japan are prized for their rarity, clarity, and scientific value.

Why Choose Our Fossils?

  • 100% authentic specimens, backed by expertise.
  • Includes a Certificate of Authenticity.
  • You receive the exact item photographed.
  • Ideal for collectors, educators, and natural history enthusiasts.

Own a remarkable fossil grouping showcasing the evolutionary diversity of ammonites from the Cretaceous seas of Japan. A true collector’s treasure!

Additional information

Era

Cretaceous

Cretaceous Information

The Cretaceous Period (145–66 million years ago) was the final era of the Mesozoic, marked by the dominance of dinosaurs and the rise of flowering plants. It had a warm, greenhouse climate, with high sea levels that created vast shallow inland seas. Marine life flourished, including mosasaurs, ammonites, and rudist reefs, while the land was ruled by iconic dinosaurs like Tyrannosaurus rex, Triceratops, and Spinosaurus. Mammals and birds diversified, and insects thrived. The period ended with the mass extinction event, likely caused by an asteroid impact, wiping out the dinosaurs and paving the way for the rise of mammals in the Cenozoic.

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