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including echinoids and ophiuroids (brittle stars)
Articulated skeletons are preserved
crust–mantle differentiation
it fed on fish
a giant predator of the Late Cretaceous period
5.6" Aragonite Stalactite Slice Cave Calcite Crystal Mineral Specimen Morocco Ferruginous including echinoids and ophiuroids (brittleLocation: Morocco Weight: 14. 3 Ounces Dimensions: 5. 6 Inches Long, 4. 7 Inches Wide, 0. 6 Inches Wide The item pictured is the item you will receive Without Aragonite, many of Earths organisms would struggle to survive. It is a mineral used by most invertebrates to build their shells and other hard structures. If you've ever admired a colorful seashell, you've indirectly appreciated Aragonite's range of colors and its easy formation at Earths