detailed fossil ammonite dark grey rock prehistoric marine mollusk |
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| navigate by keyword : fossil ammonite prehistoric extinct geology paleontology spiral invertebrate marine ancient rock stone detail texture history science natural nature gray grey closeup macro surface structure pattern shell coiled age excavation discovery specimen jurassic cretaceous time evolution wildlife underwater ocean sea earth mineral archeology fossilization background close abstract |
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| Ammonite fossil embedded in dark grey rock, exhibiting a spiral, ribbed pattern. The fossil's intricate details contrast with the surrounding stone, typical of extinct marine mollusks once thriving in ancient seas. Fossil displays distinct whorls and radial symmetry, showcasing preservation of shell structure. Ammonites are significant in geologic studies for dating and environmental reconstruction, flourishing during the Mesozoic era before extinction at the end of the Cretaceous period. |
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