Rare Idiohamites fremonti Heteromorph Ammonite Fossil Cretaceous Albian Texas USA Genuine Certified Specimen | Collector Fossil
£ 14.40
AUTHENTIC IDIOHAMITES FREMONTI AMMONITE FOSSIL FROM TEXAS, USAThis listing presents a rare Idiohamites fremonti heteromorph ammonite fossil,
dating from the Albian Stage of the Early Cretaceous Period, approximately 113–100 million years ago. Discovered in North Texas, USA, this specimen represents an extraordinary example of heteromorph ammonite morphology and is a highly sought-after fossil for both collectors and researchers. Each specimen we sell is 100% genuine, carefully selected, and comes with a Certificate of Authenticity. The fossil shown in the photographs is the exact piece you will receive, with a 1 cm scale cube included for accurate size reference GEOLOGICAL AGE AND PROVENANCEThe Albian Stage marks a pivotal period in Earth’s history when shallow epicontinental seas spread across large parts of North America. In what is now Texas, marine deposits formed in these warm shallow seas, creating perfect conditions for preserving ammonites and other marine invertebrates. The presence of Idiohamites fremonti in Albian strata adds significant value to this fossil, as these species serve as important markers for biostratigraphic studies and help to define zones within the Cretaceous system. Fossils from this region provide an invaluable record of life in the Western Interior Seaway and are prized by collectors worldwide. FOSSIL TYPE AND SCIENTIFIC CLASSIFICATIONAmmonites were marine molluscs belonging to the order Ammonitida, closely related to modern squid and octopuses. The genus Idiohamites, and particularly the species Idiohamites fremonti, belongs to the family Hamitidae within the superfamily Turrilitoidea. These ammonites are considered heteromorphs, meaning their shells deviate from the familiar spiral shape and instead exhibit irregular or loosely coiled morphologies. Their distinctive shell form reflects evolutionary adaptations within Cretaceous seas and provides key evidence for studying ammonite diversity and ecology. MORPHOLOGY AND DISTINCTIVE FEATURESIdiohamites fremonti is easily recognised by its open, hook-like coiling and strong ribbing. The heteromorph shell structure often displays alternating straight and curved sections, setting it apart from the more conventional tightly coiled ammonites. These unique features made heteromorph ammonites an evolutionary experiment in shell design, influencing buoyancy, swimming behaviour, and possibly even ecological niche. The striking appearance of this fossil makes it both scientifically important and visually impressive for display purposes. SCIENTIFIC AND COLLECTOR SIGNIFICANCESpecimens of Idiohamites fremonti are of considerable scientific interest because they serve as index fossils, used by geologists to date and correlate Albian-aged rocks. Their distinctive morphology and restricted time range make them highly valuable for establishing the biozonation of Cretaceous strata in North America. For collectors, owning a heteromorph ammonite such as this represents an opportunity to acquire a fossil that combines rarity, geological importance, and aesthetic appeal. Its provenance from North Texas only enhances its significance, as fossils from this region are highly regarded for their quality and historical importance in palaeontology. PROVENANCE AND AUTHENTICITY
• Species: Idiohamites fremonti
• Fossil Type: Heteromorph ammonite
• Geological Stage: Albian, Early Cretaceous (~113–100 million years ago)
• Location: North Texas, USA
• Family: Hamitidae
• Superfamily: Turrilitoidea
• Order: Ammonitida
• Notable Features: Hook-like heteromorph coiling, strong ribbing, rare Albian ammonite
• Authenticity: 100% genuine fossil with Certificate of Authenticity
• Photographs: Exact specimen shown, with 1 cm scale cube for size reference A CAREFULLY SELECTED SPECIMENThis Idiohamites fremonti heteromorph ammonite fossil has been carefully chosen for its rarity, preservation, and scientific value. The fossil you see in the photographs is the precise specimen you will receive, ensuring full transparency and authenticity. Every purchase is backed by a Certificate of Authenticity, making it a trusted addition to any private collection, educational resource, or museum display.This rare heteromorph ammonite from North Texas is an extraordinary collector’s piece, combining evolutionary significance, geological context, and visual uniqueness from the Albian seas of the Early Cretaceous.
dating from the Albian Stage of the Early Cretaceous Period, approximately 113–100 million years ago. Discovered in North Texas, USA, this specimen represents an extraordinary example of heteromorph ammonite morphology and is a highly sought-after fossil for both collectors and researchers. Each specimen we sell is 100% genuine, carefully selected, and comes with a Certificate of Authenticity. The fossil shown in the photographs is the exact piece you will receive, with a 1 cm scale cube included for accurate size reference GEOLOGICAL AGE AND PROVENANCEThe Albian Stage marks a pivotal period in Earth’s history when shallow epicontinental seas spread across large parts of North America. In what is now Texas, marine deposits formed in these warm shallow seas, creating perfect conditions for preserving ammonites and other marine invertebrates. The presence of Idiohamites fremonti in Albian strata adds significant value to this fossil, as these species serve as important markers for biostratigraphic studies and help to define zones within the Cretaceous system. Fossils from this region provide an invaluable record of life in the Western Interior Seaway and are prized by collectors worldwide. FOSSIL TYPE AND SCIENTIFIC CLASSIFICATIONAmmonites were marine molluscs belonging to the order Ammonitida, closely related to modern squid and octopuses. The genus Idiohamites, and particularly the species Idiohamites fremonti, belongs to the family Hamitidae within the superfamily Turrilitoidea. These ammonites are considered heteromorphs, meaning their shells deviate from the familiar spiral shape and instead exhibit irregular or loosely coiled morphologies. Their distinctive shell form reflects evolutionary adaptations within Cretaceous seas and provides key evidence for studying ammonite diversity and ecology. MORPHOLOGY AND DISTINCTIVE FEATURESIdiohamites fremonti is easily recognised by its open, hook-like coiling and strong ribbing. The heteromorph shell structure often displays alternating straight and curved sections, setting it apart from the more conventional tightly coiled ammonites. These unique features made heteromorph ammonites an evolutionary experiment in shell design, influencing buoyancy, swimming behaviour, and possibly even ecological niche. The striking appearance of this fossil makes it both scientifically important and visually impressive for display purposes. SCIENTIFIC AND COLLECTOR SIGNIFICANCESpecimens of Idiohamites fremonti are of considerable scientific interest because they serve as index fossils, used by geologists to date and correlate Albian-aged rocks. Their distinctive morphology and restricted time range make them highly valuable for establishing the biozonation of Cretaceous strata in North America. For collectors, owning a heteromorph ammonite such as this represents an opportunity to acquire a fossil that combines rarity, geological importance, and aesthetic appeal. Its provenance from North Texas only enhances its significance, as fossils from this region are highly regarded for their quality and historical importance in palaeontology. PROVENANCE AND AUTHENTICITY
• Species: Idiohamites fremonti
• Fossil Type: Heteromorph ammonite
• Geological Stage: Albian, Early Cretaceous (~113–100 million years ago)
• Location: North Texas, USA
• Family: Hamitidae
• Superfamily: Turrilitoidea
• Order: Ammonitida
• Notable Features: Hook-like heteromorph coiling, strong ribbing, rare Albian ammonite
• Authenticity: 100% genuine fossil with Certificate of Authenticity
• Photographs: Exact specimen shown, with 1 cm scale cube for size reference A CAREFULLY SELECTED SPECIMENThis Idiohamites fremonti heteromorph ammonite fossil has been carefully chosen for its rarity, preservation, and scientific value. The fossil you see in the photographs is the precise specimen you will receive, ensuring full transparency and authenticity. Every purchase is backed by a Certificate of Authenticity, making it a trusted addition to any private collection, educational resource, or museum display.This rare heteromorph ammonite from North Texas is an extraordinary collector’s piece, combining evolutionary significance, geological context, and visual uniqueness from the Albian seas of the Early Cretaceous.
