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Shell of extant deep water squid Spirula (Spirula spirula) backlit and sectioned to show how the structure of partitions within the shell is reminiscent of the extinct ammonites and living nautiloids.
90732683
90732683 Shell of extant deep water squid Spirula (Spirula spirula) backlit and sectioned to show how the structure of partitions within the shell is reminiscent of the extinct ammonites and living nautiloids.© Paul D Stewart
Sectioned fossil ammonite where the shell material has been replaced by pyrites, and the empty cavities of the shell have filled during fossilisation with crystalised yellow/green calcite preserving d...
90732557
90732557 Sectioned fossil ammonite where the shell material has been replaced by pyrites, and the empty cavities of the shell have filled during fossilisation with crystalised yellow/green calcite preserving d...© Paul D Stewart
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