VERY RARE Heteromorph Ammonite Scaphites – Hoploscaphites cheyennensis, Pierre Shales, Maastrichtian, Late Cretaceous, USA – COA

Description

This VERY RARE Heteromorph ammonite fossil, Scaphites – Hoploscaphites cheyennensis, is an exceptional specimen from the Pierre Shales and Fox Hills Sandstone formations of Egremont, South Dakota, USA. This 100% genuine specimen is from the Maastrichtian, Late Cretaceous period, and comes with a Certificate of Authenticity. The Hoploscaphites cheyennensis is a heteromorphic ammonite, characterized by its distinct, coiled shape, making it a prized piece for fossil collectors and enthusiasts of Cretaceous ammonites.

Geology and Fossil Type

• Geological Stage: Maastrichtian, Late Cretaceous
• Depositional Environment: Marine (During the Maastrichtian period, the Pierre Shales and Fox Hills Sandstone were marine environments, ideal for the growth of ammonites like Hoploscaphites cheyennensis. The ammonite fossil was preserved in marine deposits from these environments in South Dakota.)
• Family: Scaphitidae (The Hoploscaphites cheyennensis species belongs to the Scaphitidae family, known for their heteromorphic ammonites, which exhibit unusual coiling patterns and distinctive shapes.)
• Superfamily: Ammonoidea
• Order: Ammonitida (The Hoploscaphites cheyennensis ammonite, like other ammonites, is part of the Cephalopoda class, which is closely related to modern-day squid, octopuses, and cuttlefish.)

Morphology Features

This Hoploscaphites cheyennensis ammonite is a heteromorphic ammonite, which means its shell is coiled in a distinct, non-typical spiral shape. Unlike other ammonites, the Hoploscaphites cheyennensis has an irregular coiling pattern, characterized by a distinct knobby, corkscrew appearance. The surface of the ammonite features distinctive, bumpy ridges and visible suture lines, adding to its scientific and aesthetic value. Its unusual shape and distinctive features make it a standout fossil specimen.

Notable Features

• Very Rare Heteromorph: The Hoploscaphites cheyennensis ammonite is a rare and highly sought-after fossil for collectors.
• Unusual Corkscrew Shape: The ammonite’s distinct corkscrew-like coiling is one of the key features that make it unique and visually striking.
• Preserved Surface Details: The fossil features bumpy ridges and suture lines that are clearly visible, adding to its beauty and appeal.
• Size: This ammonite specimen is carefully chosen for its excellent preservation and well-defined features.
• Scientific Importance: This ammonite helps to understand the marine ecosystems of the Late Cretaceous period and provides important insights into the evolutionary history of heteromorphic ammonites.

Size and Presentation

• Scale Cube: 1cm
• Full sizing is provided in the photos, so you can see the exact size of the ammonite.
• Actual Fossil: The fossil pictured is the exact piece you will receive.

Key Selling Points

• 100% Genuine Fossil
• Comes with a Certificate of Authenticity
• Very rare and unique Hoploscaphites cheyennensis ammonite, from the Maastrichtian, Late Cretaceous period
• Features distinct corkscrew-like coiling, knobby appearance, and visible suture lines
• Ideal for collectors and those interested in Cretaceous ammonites, marine fossils, and heteromorphic ammonites

This Hoploscaphites cheyennensis fossil from the Pierre Shales and Fox Hills Sandstone of Egremont, South Dakota, USA is a remarkable specimen from the Maastrichtian, Late Cretaceous period. Its knobby appearance, asymmetric coiling, and well-preserved surface details make it a highly prized piece for fossil collectors and those with a keen interest in Cretaceous ammonites and marine life.