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.
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