RARE 4.5″ Baculites Fossil Ammonite – Baculites sp., Bearpaw Shale, Campanian, Cretaceous, Montana, USA – Genuine Specimen with COA

Description

This is a rare 4.5-inch Baculites sp. ammonite fossil from the Bearpaw Shale Formation, Campanian stage of the Late Cretaceous period, discovered in Montana, USA. Baculites were an extinct genus of straight-shelled ammonites, closely related to modern squid and cuttlefish. Unlike coiled ammonites, Baculites evolved a long, uncoiled shell, enabling them to adapt to different marine environments.

The Bearpaw Shale is famous for preserving exceptional Late Cretaceous marine fossils, including ammonites, mosasaurs, and marine reptiles. This Baculites specimen is well-preserved with visible suture patterns and is an excellent example of this unique cephalopod group.

Geological Information:

• Formation: Bearpaw Shale Formation
• Stage: Campanian (~80-72 million years old)
• Location: Montana, USA
• Depositional Environment: Marine seafloor sediments from the Western Interior Seaway

Fossil Characteristics:

• Straight-shelled ammonite with well-defined suture lines
• Preserved in original marine sedimentary matrix
• Excellent example of Late Cretaceous cephalopod evolution
• Rare fossil from a well-documented fossil locality

Key Features:

• Authentic Baculites sp. fossil ammonite
• Well-preserved structure with clear surface details
• From the Alice Purnell Collection
• 100% genuine specimen with Certificate of Authenticity

Scale Rule / Cube = 1cm – Please refer to the photos for accurate sizing.

All fossils are securely packaged for worldwide shipping.