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Histological sections through element of Astraspis. (A) Section showing the basal layer of Astraspis associated with global calcified cartilage. (B) Zoom showing the basal layer exhibiting the chondroid bone layer. (C) Zoom on the global calcified cartilage layer, showing Liesegang rings around cell spaces. (D) Example of globular calcified cartilage found in Harding sandstone. b.l, basal layer; gcc, globular calcified cartilage; lac, lacunae; L.r, Liesegang rings. Scale bars 100 μm.
