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Gryphaea arcuata Lamarck, fossil oysters
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Gryphaea arcuata Lamarck, fossil oysters
About 190 million years old, found in the Lias clays and limestones of the Jurassic period. Commonly called Devils Toenails
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Media ID 8590951
© Mary Evans Picture Library 2015 - https://copyrighthub.org/s0/hub1/creation/maryevans/MaryEvansPictureID/10709333
Bivalve Bivalve Mollusc Bivalvia Clay Clay Mineral Devils Early Jurassic Fossil Fossilised Jurassic Lamellibranch Lamellibranchia Lias Mesozoic Mineral Mollusc Mollusca Mollusk Ostreoida Oyster Phanerozoic Gryphaea Invertebrata Lower Jurassic
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EDITORS COMMENTS
1. Title: "Devils' Toenails: A Glimpse into the Jurassic Sea Floor with Gryphaea arcuata Fossils" 2.. This image showcases a collection of Gryphaea arcuata fossils, also known as Devils' Toenails or Honeycomb Oysters, discovered in the Lias clays and limestones of the Jurassic period. Approximately 190 million years old, these ancient bivalves are a testament to the rich marine life that thrived during the Mesozoic Era. Gryphaea arcuata is a unique and intriguing bivalve mollusc belonging to the Ostreoida family. Its distinctive fan-shaped shell, characterized by its radial ribbing and complex hinge, is a marvel of evolution. The fossils in this photograph display the remarkable preservation of the shell's intricate details, providing a glimpse into the marine environment of the Early Jurassic. The fossils' association with clay minerals adds an additional layer of interest. The clay, which encases the shells, has played a crucial role in their preservation. Over millions of years, the minerals have replaced the original organic material, creating a mineralized fossil. As lower Jurassic bivalves, Gryphaea arcuata is a valuable addition to the Phanerozoic record, a geological time period marked by the presence of abundant fossils. The fossils' lamellibranch status, as filter-feeding invertebrates, highlights their role in the Jurassic food chain and the complex marine ecosystems that existed during this time. This collection of Devils' Toenails serves as a reminder of the rich history hidden beneath the earth's surface, inviting us to explore the wonders of the Mesozoic Era and the fascinating world of marine invertebrates.
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