148.45ct Whale Bone Fossil – Gemstone-Grade Specimen – Miocene, Calvert Formation, Maryland

This 148.45-carat whale bone fossil specimen comes from the famous Calvert Formation of Maryland, a world-renowned Miocene deposit celebrated for its marine fossils. Calvert whale bone is highly collectible for its distinctive porous structure, mineralization patterns, and historical significance tied to ancient marine mammals.

This piece shows excellent preservation, with visible internal structure and attractive natural coloration ranging from tan to deep brown. Its density, texture, and surface detail make it an appealing choice for fossil collectors, lapidary enthusiasts, and those seeking unique gemstone-grade fossil material.

Weight: 148.45ct
Material: Fossil Whale Bone
Age: Miocene (approx. 15–18 million years old)
Formation: Calvert Formation
Locality: Maryland, USA

A beautiful and scientifically significant fossil whale bone specimen—perfect for display, study, or addition to a curated fossil or gemstone collection.