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Asteroceras and promicroceras, ammonites
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Asteroceras and promicroceras, ammonites
A rock specimen containing Asteroceras (large shell) and Promicroceras (small shell) ammonites from the Lower Lias, Marston Magna, near Yeovil, Somerset
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Media ID 8598169
© Mary Evans Picture Library 2015 - https://copyrighthub.org/s0/hub1/creation/maryevans/MaryEvansPictureID/10704056
Ammonite Ammonitida Ammonoid Ammonoidea Arietitidae Asteroceras Cephalopod Cephalopoda Coil Eoderocerataceae Eoderoceratidae Many Marston Mixture Mollusc Mollusca Mollusk Shell Spiral Variation Yeovil Invertebrata
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> Ammonoid
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> Cephalopods
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> Yeovil
EDITORS COMMENTS
In this geological treasure, the intricately detailed shells of two distinct ammonite species, Asteroceras and Promicroceras, coexist in a harmonious mixture. This exquisite rock specimen, hailing from the Lower Lias formation in Marston Magna, near Yeovil, Somerset, offers a glimpse into the rich marine history of the region. Ammonites, a type of cephalopod and mollusk, are characterized by their distinctive spiral shells. The larger Asteroceras, a member of the Arietitidae family, boasts an impressive, tightly coiled shell, adorned with intricate, radial ribbing. In contrast, the smaller Promicroceras, belonging to the Eoderoceratidae family, displays a more delicate, finely ribbed shell, typical of the Eoderoceratidae. The presence of both species within the same specimen highlights the intriguing variations and adaptations that characterize the ammonite family. The Asteroceras and Promicroceras lived during the Early Jurassic period, approximately 183 million years ago. Their fossilized remains provide invaluable insights into the marine ecosystems that existed during this time, offering a window into the diverse and ever-evolving world of the ancient oceans. This stunning specimen serves as a testament to the beauty and complexity of the natural world, inviting us to explore the wonders of the geological past and the intricate relationships that exist between the various species that have inhabited our planet. The Asteroceras and Promicroceras, with their unique shells and fascinating histories, continue to captivate and inspire curiosity, reminding us of the rich tapestry of life that has unfolded over millions of years.
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