JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
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. Chlamys (pectinid bivalve mollusc); 9. Cidaris (sea urchin); 10. Cladophyllia conybeari (coral); and 13. Lithophaga (boring bivalve mollusc). A scale bar (10 centimetre) is at lower right.
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