JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
Prehistoric mud-mound. Illustration of the marine invertebrates found on a prehistoric structure known as a mud-mound. This is a non-skeletal structure, a form of carbonate platform, similar to today's coral reefs but formed by different processes and in different conditions. The fossil records indicates that mud-mounds were more common in prehistoric times. The number labels indicate: 1. A scale bar (0.5 metres) is at lower right.
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