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and sea urchins
which tells us about the osteology of these ancient animals
The detail is excellent
early dinosaur with open skull bones (hence its name) The body was long and slim
Aragonite Crystals Dimetrodon and sea urchinsAragonite is a carbonate mineral, one of the two common, naturally occurring polymorphs of calcium carbonate, CaCO3. The other polymorph is the mineral calcite. Aragonite's crystal lattice differs from that of calcite, resulting in a different crystal shape, an orthorhombic system with acicular crystals. Repeated twinning results in pseudo hexagonal forms. Aragonite may be columnar or fibrous, occasionally in branching stalactitic forms called flos
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