Jurassic coral reef. Illustration of a coral reef during the Oxfordian stage of the Jurassic, 163 to 157 million years ago. A coral reef is an underwater structure found in coastal marine environments. Coral polyps secrete calcium carbonate to form some of the structures seen here, which are mostly hard corals (Scleractinia). The number labels indicate: 1. Thecosmilia (coral); 2. Isastrea (coral); 3. Thamnasteria arachnoides (coral); 4. Thamnasteria concinna (coral); 5. Rhabdophyllia (coral); 6. Lopha (bivalve mollusc); 7. a trochid gastropod; 8. Chlamys (pectinid bivalve mollusc); 9. Cidaris (sea urchin); 10. a terebratulid brachiopod; 11. a bryozoan; 12. Cladophyllia conybeari (coral); and 13. Lithophaga (boring bivalve mollusc). A scale bar (10 centimetre) is at lower right.

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TOP19851970

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達志影像

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