Description
This is a RARE 4.5″ Coilopoceras coiletti Fossil Ammonite, an exceptional and scientifically significant example from the Lower Turonian Stage of the Late Cretaceous, found in Cichahia, Mexico.
Coilopoceras coiletti belongs to a genus well known for its robust, moderately involute shell structure and distinctive ornamentation. This specimen displays the characteristic whorls and deep ribbing that typify the genus, making it a valuable piece for both display and scientific appreciation.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
The photograph shows the actual specimen you will receive, with a 1cm scale cube for reference. Please see the photo for exact dimensions.
Geological and Taxonomic Information:
- Species: Coilopoceras coiletti
- Fossil Type: Ammonite (extinct marine cephalopod)
- Age: Late Cretaceous, Lower Turonian Stage (~93.9 to 89.8 million years ago)
- Locality: Cichahia, Mexico
- Formation: Likely part of the marine sequences of the Guerrero-Morelos Basin
- Depositional Environment: Shallow marine carbonate platform or basin margin deposits
- Geological Stage: Lower Turonian
- Biozone: May correspond to the Watinoceras devonense or Mammites nodosoides biozones
Taxonomic Classification:
- Order: Ammonitida
- Superfamily: Acanthoceratoidea
- Family: Coilopoceratidae
- Genus: Coilopoceras
- Species: Coilopoceras coiletti
- Described By: Marcou, 1858
Morphology & Notable Features:
- Involute to moderately involute shell with slightly compressed whorls
- Ribbing strong and flexuous, extending across the flanks
- Venter tends to be rounded or slightly keeled
- Umbilicus small and deeply incised
- Sutural patterns moderately complex, typical of mid-Cretaceous ammonites
Scientific & Collector Significance:
Coilopoceras coiletti is a key index fossil for the Lower Turonian stage of the Late Cretaceous and plays a critical role in global biostratigraphy. Its presence in Mexico reflects widespread marine transgressions and a thriving cephalopod fauna during the early part of the Turonian.
This well-preserved example from Cichahia makes for a rare and informative addition to any fossil collection, especially given the rarity of high-quality Coilopoceratidae specimens from this region.
Specimen Details:
- Approximate Size: 4.5 inches – see photo with 1cm scale cube
- Condition: Fully prepared and ideal for display
- Locality: Cichahia, Mexico
- Includes: Certificate of Authenticity
Ideal For:
- Cretaceous ammonite collectors
- Biostratigraphic and paleontological reference collections
- Museum or educational display
- Unique natural history gifts for fossil enthusiasts
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