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5.5" MORTONICERAS Ammonite Fossil Cretaceous Albian Texas USA
5.5" MORTONICERAS Ammonite Fossil Cretaceous Albian Texas USA - Image 2

5.5″ MORTONICERAS Ammonite Fossil Cretaceous Albian Texas USA

£72.00

This listing features a beautiful and well-preserved 5.5-inch specimen of the ammonite Mortoniceras, collected from the Duck Creek Formation, dating to the Upper Albian Stage of the Cretaceous period. This fossil was found in Spring Creek, Cooke County, Texas, USA – a well-known site for stunning mid-Cretaceous marine fossils.

The genus Mortoniceras is recognised for its sharply defined ribbing, ventrolateral tubercles, and robust shell structure. These ammonites thrived in the Western Interior Seaway, a shallow epicontinental sea that once split North America, teeming with diverse marine life.

Geological & Scientific Details:

  • Species: Mortoniceras (exact species undetermined)
  • Family: Brancoceratidae
  • Superfamily: Acanthoceratoidea
  • Order: Ammonitida
  • Geological Period: Cretaceous
  • Geological Stage: Upper Albian
  • Formation: Duck Creek Formation
  • Location: Spring Creek, Cooke County, Texas, USA
  • Depositional Environment: Shallow marine shelf – Western Interior Seaway
  • Morphology Features: Evolute coiling, prominent ribbing, ventrolateral tuberculation, compressed to moderately inflated shell

Why This Specimen Stands Out:

  • Stunning 5.5″ Mortoniceras ammonite fossil
  • Excellent preservation of key diagnostic features
  • Clearly visible ribbing and tubercles
  • From a renowned Texas fossil site
  • Ideal for collectors, educational use, or display
  • The photo shows the exact specimen you will receive
  • Includes Certificate of Authenticity

Scale Reference: Scale Rule Squares / Cube = 1cm – Please refer to the photo for full sizing.

Shipping & Packaging:

  • Securely packed to ensure safe delivery
  • Tracked international shipping available

This ammonite represents an iconic example of mid-Cretaceous marine life from North America and is a valuable specimen for both amateur and professional fossil enthusiasts.

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

(Actual as seen)

Only 1 left in stock

SKU: UF3543 Category:

Description

This listing features a beautiful and well-preserved 5.5-inch specimen of the ammonite Mortoniceras, collected from the Duck Creek Formation, dating to the Upper Albian Stage of the Cretaceous period. This fossil was found in Spring Creek, Cooke County, Texas, USA – a well-known site for stunning mid-Cretaceous marine fossils.

The genus Mortoniceras is recognised for its sharply defined ribbing, ventrolateral tubercles, and robust shell structure. These ammonites thrived in the Western Interior Seaway, a shallow epicontinental sea that once split North America, teeming with diverse marine life.

Geological & Scientific Details:

  • Species: Mortoniceras (exact species undetermined)
  • Family: Brancoceratidae
  • Superfamily: Acanthoceratoidea
  • Order: Ammonitida
  • Geological Period: Cretaceous
  • Geological Stage: Upper Albian
  • Formation: Duck Creek Formation
  • Location: Spring Creek, Cooke County, Texas, USA
  • Depositional Environment: Shallow marine shelf – Western Interior Seaway
  • Morphology Features: Evolute coiling, prominent ribbing, ventrolateral tuberculation, compressed to moderately inflated shell

Why This Specimen Stands Out:

  • Stunning 5.5″ Mortoniceras ammonite fossil
  • Excellent preservation of key diagnostic features
  • Clearly visible ribbing and tubercles
  • From a renowned Texas fossil site
  • Ideal for collectors, educational use, or display
  • The photo shows the exact specimen you will receive
  • Includes Certificate of Authenticity

Scale Reference: Scale Rule Squares / Cube = 1cm – Please refer to the photo for full sizing.

Shipping & Packaging:

  • Securely packed to ensure safe delivery
  • Tracked international shipping available

This ammonite represents an iconic example of mid-Cretaceous marine life from North America and is a valuable specimen for both amateur and professional fossil enthusiasts.

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

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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