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Mortoniceras equidistans Ammonite Fossil | Cretaceous Texas | Duck Creek Formation | Authentic Fossil with COA
Mortoniceras equidistans Ammonite Fossil | Cretaceous Texas | Duck Creek Formation | Authentic Fossil with COA - Image 2

Mortoniceras equidistans Ammonite Fossil | Cretaceous Texas | Duck Creek Formation | Authentic Fossil with COA

£18.00

This listing offers a fine specimen of Mortoniceras equidistans, an ammonite fossil from the Duck Creek Formation, dated to the Upper Albian Stage of the Cretaceous Period (~105 million years ago). Found at Spring Creek, Cooke County, Texas, USA, this piece is a scientifically recognised ammonite species important for biostratigraphy.

You will receive the exact fossil shown in the photo. Please note that the cube in the image = 1cm for scale. The fossil comes with a Certificate of Authenticity, and as always, all of our specimens are 100% genuine.

Geological & Taxonomic Overview:

  • Fossil Type: Ammonite (extinct cephalopod)
  • Species: Mortoniceras equidistans
  • Family: Brancoceratidae
  • Superfamily: Acanthoceratoidea
  • Order: Ammonitida
  • Formation: Duck Creek Formation
  • Age: Upper Albian, Cretaceous Period
  • Location: Spring Creek, Cooke County, Texas, USA
  • Depositional Environment: Shallow marine shelf of the Western Interior Seaway
  • Biozone: Mortoniceras equidistans is often used within the Upper Albian ammonite biostratigraphic framework
  • Formally Described By: Meek (1876)

Morphology & Distinctive Features:

  • Exhibits a moderately involute, compressed shell with clearly spaced and equidistant ribs—the feature for which it is named
  • Ornamented with ventrolateral tubercles and lateral ribs that remain evenly spaced across whorls
  • Well-preserved suture lines highlight classic Mortoniceras traits
  • High relief against the surrounding matrix makes it ideal for display or study

Scientific Importance: Mortoniceras equidistans is notable for its regular ribbing and use in identifying Upper Albian zones across North America and Europe. It represents a transitional form that provides key insights into the morphological evolution of Mortoniceras.

Collector Display Appeal:

  • Aesthetic shell with well-defined ribs and ornamentation
  • Great educational example of Albian ammonite diversity
  • Professionally cleaned and conserved for maximum visual and structural integrity

Why Choose Us?

  • Each fossil is a 100% authentic specimen
  • Comes with a Certificate of Authenticity
  • Responsibly sourced, handled with scientific care

This Mortoniceras equidistans ammonite is a perfect addition for any fossil collector, geologist, or educator—combining visual appeal with stratigraphic significance. Own a true relic of Earth’s Cretaceous seas today.

(Actual as seen)

Only 1 left in stock

SKU: UF3558 Category:

Description

This listing offers a fine specimen of Mortoniceras equidistans, an ammonite fossil from the Duck Creek Formation, dated to the Upper Albian Stage of the Cretaceous Period (~105 million years ago). Found at Spring Creek, Cooke County, Texas, USA, this piece is a scientifically recognised ammonite species important for biostratigraphy.

You will receive the exact fossil shown in the photo. Please note that the cube in the image = 1cm for scale. The fossil comes with a Certificate of Authenticity, and as always, all of our specimens are 100% genuine.

Geological & Taxonomic Overview:

  • Fossil Type: Ammonite (extinct cephalopod)
  • Species: Mortoniceras equidistans
  • Family: Brancoceratidae
  • Superfamily: Acanthoceratoidea
  • Order: Ammonitida
  • Formation: Duck Creek Formation
  • Age: Upper Albian, Cretaceous Period
  • Location: Spring Creek, Cooke County, Texas, USA
  • Depositional Environment: Shallow marine shelf of the Western Interior Seaway
  • Biozone: Mortoniceras equidistans is often used within the Upper Albian ammonite biostratigraphic framework
  • Formally Described By: Meek (1876)

Morphology & Distinctive Features:

  • Exhibits a moderately involute, compressed shell with clearly spaced and equidistant ribs—the feature for which it is named
  • Ornamented with ventrolateral tubercles and lateral ribs that remain evenly spaced across whorls
  • Well-preserved suture lines highlight classic Mortoniceras traits
  • High relief against the surrounding matrix makes it ideal for display or study

Scientific Importance: Mortoniceras equidistans is notable for its regular ribbing and use in identifying Upper Albian zones across North America and Europe. It represents a transitional form that provides key insights into the morphological evolution of Mortoniceras.

Collector Display Appeal:

  • Aesthetic shell with well-defined ribs and ornamentation
  • Great educational example of Albian ammonite diversity
  • Professionally cleaned and conserved for maximum visual and structural integrity

Why Choose Us?

  • Each fossil is a 100% authentic specimen
  • Comes with a Certificate of Authenticity
  • Responsibly sourced, handled with scientific care

This Mortoniceras equidistans ammonite is a perfect addition for any fossil collector, geologist, or educator—combining visual appeal with stratigraphic significance. Own a true relic of Earth’s Cretaceous seas today.

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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