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Aptyxiella portlandica (Sowerby), Portland screwstone
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Aptyxiella portlandica (Sowerby), Portland screwstone
A gastropod steinkern or internal cast of a Portland screwstone (Aptyxiella portlandica) from the Jurassic Portland Stone, Top Roach, Portland
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Media ID 8609600
© Mary Evans Picture Library 2015 - https://copyrighthub.org/s0/hub1/creation/maryevans/MaryEvansPictureID/10713717
Coil Gastropod Gastropoda Jurassic Mesozoic Mollusc Mollusca Mollusk Phanerozoic Portland Prehistoric Screw Sowerby Invertebrata
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This print showcases an exquisite example of Aptyxiella portlandica, also known as the Portland screwstone or Portland coil, a fascinating invertebrate fossil discovered within the Jurassic Portland Stone of Top Roach, Portland. This gastropod, belonging to the family Nerineidae, is a mesozoic mollusk that lived during the Phanerozoic Con interval, approximately 183 million to 166 million years ago. The Portland screwstone is a unique type of fossil, known as a steinkern or internal cast, which forms when a soft-bodied organism is preserved by the mineralization of its surrounding environment. In the case of Aptyxiella portlandica, the fossilized remains of the animal's delicate shell have been replaced by calcite, leaving behind a stunning, intricately coiled imprint. The Portland screwstone is a testament to the complex and diverse range of life that existed during the Jurassic period. Its spiral shape and delicate details are a reminder of the intricate beauty that can be found in even the smallest of fossils. The Portland screwstone is not only a scientifically significant discovery but also a visually stunning example of the natural world's intricacies. Sowerby, a renowned British naturalist, first described Aptyxiella portlandica in 1812, adding to our understanding of the rich fossil record of the Jurassic period. This print serves as a reminder of the importance of preserving and studying our planet's natural history, providing valuable insights into the past and inspiring awe and wonder for generations to come.
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