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RARE Fossil Ammonite RHAEBOCERAS BURKHOLDERI & Inoceramid Bivalve – Lower Campanian, Cretaceous: Montana, USA – Certified Specimen
RARE Fossil Ammonite RHAEBOCERAS BURKHOLDERI & Inoceramid Bivalve – Lower Campanian, Cretaceous: Montana, USA – Certified Specimen - Image 2
RARE Fossil Ammonite RHAEBOCERAS BURKHOLDERI & Inoceramid Bivalve – Lower Campanian, Cretaceous: Montana, USA – Certified Specimen - Image 3
RARE Fossil Ammonite RHAEBOCERAS BURKHOLDERI & Inoceramid Bivalve – Lower Campanian, Cretaceous: Montana, USA – Certified Specimen - Image 4

RARE Fossil Ammonite RHAEBOCERAS BURKHOLDERI & Inoceramid Bivalve – Lower Campanian, Cretaceous: Montana, USA – Certified Specimen

£36.00

Presenting a RARE paired fossil: the heteromorph ammonite Rhaeboceras burkholderi alongside a beautifully preserved Inoceramid bivalve, discovered in Montana, USA. This remarkable specimen hails from the Lower Campanian stage of the Late Cretaceous, dating approximately 83 to 80 million years ago.

The ammonite Rhaeboceras burkholderi belongs to the family Collignoniceratidae, order Ammonitida. It is noted for its distinctive compressed and ornate shell with strong ribbing and involute coiling. These features make it highly recognizable among North American Campanian ammonites. Accompanying it is an Inoceramid bivalve, an iconic filter-feeding mollusc from the same marine strata.

Geological & Scientific Details:

  • Scientific Name: Rhaeboceras burkholderi (Ammonite), Inoceramus sp. (Bivalve)
  • Fossil Type: Heteromorph Ammonite with Bivalve
  • Geological Period: Cretaceous
  • Stage: Lower Campanian (~83–80 million years ago)
  • Formation: Likely part of the Claggett or Bearpaw formations
  • Location Found: Montana, United States
  • Order (Ammonite): Ammonitida
  • Family (Ammonite): Collignoniceratidae
  • Bivalve Family: Inoceramidae
  • Morphological Features (Ammonite): Robust, finely ribbed shell with a compressed whorl section and potential tubercles
  • Morphological Features (Bivalve): Thick-shelled, concentric ribbing, often found in deep-sea marine clays
  • Depositional Environment: Shallow to moderately deep marine setting within the Western Interior Seaway
  • Biozone & Notable: Used in regional North American Campanian stratigraphy; associated with marine transgressive systems

Rhaeboceras was first described in North America and is one of the hallmark ammonite genera of the Campanian. Its association with Inoceramus bivalves highlights the rich benthic-pelagic interaction of Cretaceous seaways.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Please Note:

  • Scale Rule Squares / Cube = 1cm – full sizing is shown in the photo
  • The fossil pictured is the exact specimen you will receive
  • This is a carefully chosen and authenticated piece selected for its scientific interest and aesthetic preservation

An exceptional fossil pairing that offers both educational and collector value from a key geologic interval in North American paleontology.

(Actual as seen)

Only 1 left in stock

SKU: UF3782 Category:

Description

Presenting a RARE paired fossil: the heteromorph ammonite Rhaeboceras burkholderi alongside a beautifully preserved Inoceramid bivalve, discovered in Montana, USA. This remarkable specimen hails from the Lower Campanian stage of the Late Cretaceous, dating approximately 83 to 80 million years ago.

The ammonite Rhaeboceras burkholderi belongs to the family Collignoniceratidae, order Ammonitida. It is noted for its distinctive compressed and ornate shell with strong ribbing and involute coiling. These features make it highly recognizable among North American Campanian ammonites. Accompanying it is an Inoceramid bivalve, an iconic filter-feeding mollusc from the same marine strata.

Geological & Scientific Details:

  • Scientific Name: Rhaeboceras burkholderi (Ammonite), Inoceramus sp. (Bivalve)
  • Fossil Type: Heteromorph Ammonite with Bivalve
  • Geological Period: Cretaceous
  • Stage: Lower Campanian (~83–80 million years ago)
  • Formation: Likely part of the Claggett or Bearpaw formations
  • Location Found: Montana, United States
  • Order (Ammonite): Ammonitida
  • Family (Ammonite): Collignoniceratidae
  • Bivalve Family: Inoceramidae
  • Morphological Features (Ammonite): Robust, finely ribbed shell with a compressed whorl section and potential tubercles
  • Morphological Features (Bivalve): Thick-shelled, concentric ribbing, often found in deep-sea marine clays
  • Depositional Environment: Shallow to moderately deep marine setting within the Western Interior Seaway
  • Biozone & Notable: Used in regional North American Campanian stratigraphy; associated with marine transgressive systems

Rhaeboceras was first described in North America and is one of the hallmark ammonite genera of the Campanian. Its association with Inoceramus bivalves highlights the rich benthic-pelagic interaction of Cretaceous seaways.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Please Note:

  • Scale Rule Squares / Cube = 1cm – full sizing is shown in the photo
  • The fossil pictured is the exact specimen you will receive
  • This is a carefully chosen and authenticated piece selected for its scientific interest and aesthetic preservation

An exceptional fossil pairing that offers both educational and collector value from a key geologic interval in North American paleontology.

Additional information

Era

Cretaceous
Origin

USA

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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