Large Fossil Gastropod (Galeodea sp), Oligocene, Blakely Formation, Twin Rivers WA USA | Authentic Specimen + COA

Description

Large Fossil Gastropod (Galeodea sp) – Blakely Formation, Oligocene Epoch, Twin Rivers, Washington, USA

This impressive and well-preserved specimen is a fossil of Galeodea sp., a genus of large marine gastropods. It was collected from the Blakely Formation near Twin Rivers, Washington, and dates to the Oligocene Epoch—approximately 30 to 25 million years ago. Fossils like this represent ancient sea life that inhabited the coastal marine environments of the Pacific Northwest during the Paleogene.

Fossil Type & Classification:

• Type: Invertebrate Fossil (Marine Gastropod Shell)
• Genus: Galeodea sp.
• Phylum: Mollusca
• Class: Gastropoda
• Order: Neogastropoda
• Superfamily: Tonnoidea
• Family: Cassidae (Helmet and Bonnet snails)
• Identified by: Commonly referenced in regional molluscan faunal lists from the Blakely Formation

Geological & Stratigraphic Details:

• Location: Twin Rivers, Washington, USA
• Formation: Blakely Formation
• Geological Stage: Oligocene, Paleogene Period
• Age Range: ~30–25 million years ago
• Depositional Environment: Shallow marine coastal shelf and embayment with sandy to muddy sediments supporting diverse molluscan fauna

Morphology & Features:

• Thick, spirally coiled shell with expanded body whorl and well-defined spire
• Surface ornamentation may include spiral ridges and growth lines
• Aperture large and rounded, consistent with Cassid gastropods
• Preserved in natural matrix or as isolated shell fossil, sometimes with internal infilling
• Large size and robustness make it a visually striking display specimen

Notable: Members of the genus Galeodea are predatory sea snails and part of the Cassidae family, known for their thick shells and often elaborate surface sculpture. Fossils from the Blakely Formation provide critical insights into Oligocene marine ecosystems along the ancient North American West Coast. Specimens of Galeodea are valued by collectors for their rarity and substantial size.

Specimen Details:

• Origin: Twin Rivers, Washington, USA
• Species: Galeodea sp.
• Fossil Type: Marine Gastropod Shell
• Geological Epoch: Oligocene
• Formation: Blakely Formation
• Size Reference: Scale cube = 1cm (refer to photo for exact sizing)
• Note: The exact specimen shown in the listing photo is the one you will receive

Authenticity & Quality: This is a 100% genuine fossil, naturally preserved and professionally curated. Comes with a Certificate of Authenticity. No enhancements or reconstructions.

Why Choose This Fossil? Ideal for:

• Marine mollusk fossil collectors
• Educational use in palaeontology and invertebrate studies
• Museum-quality display pieces
• Natural history collectors seeking large gastropod specimens

Shipping & Packaging: We ship worldwide using eco-conscious packaging and tracked delivery. Each fossil is securely wrapped and boxed for safe arrival.

Add a bold and authentic example of Cenozoic marine life to your collection with this large Galeodea gastropod fossil from Washington’s Oligocene Blakely Formation.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.