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The planet we live on: The beginnings of the Earth Sciences

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Figure 1.68: A shelled cephalopod fossil with <strong>the</strong> outer shell removed so that <strong>the</strong> chambersand <strong>the</strong> suture lines can be seen. <str<strong>on</strong>g>The</str<strong>on</strong>g> suture lines here have fairly simple shapes, so thismust be a g<strong>on</strong>iatite.Figure 1.69: A coiled cephalopod fossil with <strong>the</strong> outer shell removed to show very complexsuture lines. Complex sutures like <strong>the</strong>se show it must be an amm<strong>on</strong>ite.52

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