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🪨 Fossil Type: Polished fossil bivalve clam, of the variety "Mercenaria" that lived in the Jurassic (Oxfordian) period, between 163 and 157 million years ago.
🌍⛏️ Origin: Sakahara Region - Madagascar
📐 💎 Dimensions: 68 millimeters long x 30 wide x 22 thick
⚖️ Weight: 33.8 grams
✨ Finish: Polished
🔬 Treatment: None
🎁 Comes with a Gem and Zen certificate, ideal for giving as a gift or treating yourself!
📋 Mineralogical sheet:
Property
Details
Scientific name
Examples: Mercenaria , Clausinella , Venerupis
Kind
Bivalve (shell composed of two symmetrical valves)
Geological period
Varies by species, often Cenozoic (Eocene to Miocene)
Origin / Deposits
Fossil marine sediments, limestone or sandstone cliffs
Size
A few cm to 10–12 cm depending on the species
Shape
Curved, symmetrical, sometimes slightly elongated
Shell / Texture
Smooth or slightly ridged, valves sometimes thick
Lifestyle
Filter, buried in the sand or attached to the substrate
Environment
Shallow sea, sandy or muddy bottoms
Discovery / Fossilization
Fossilization in fine sediments, shells often well preserved
Scientific significance
Study of ancient marine ecosystems, paleoecology and stratigraphy
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