Pleuroceras spinatum Fossil Ammonite Multi Block, Macdonnelli Subzone, Raricostatum Zone, The Frodingham Ironstone Formation, Lower Jurassic

Description This Pleuroceras spinatum fossil ammonite multi block is an outstanding specimen from the Lower Lias, Lower Jurassic period. Found in the Macdonnelli Subzone, Raricostatum Zone, and Obtusum Zone of the Frodingham Ironstone Formation, at Conesby Quarry, Scunthorpe, North Lincolnshire, this ammonite offers an exceptional example of Jurassic marine life from one of the most significant biozones in the Lower Jurassic. Geological Information: Geological Stage: Lower Lias, Lower Jurassic (Approximately 200 to 174 million years ago) Depositional Environment: The ammonite was preserved in the Frodingham Ironstone Formation, which is known for its rich marine deposits formed in shallow seas that covered much of Britain during the Lower Jurassic period. These seas were nutrient-rich and teeming with marine life, including ammonites, bivalves, belemnites, and various other marine organisms. The Frodingham Ironstone Formation is particularly noted for preserving ammonites like Pleuroceras spinatum in remarkable detail. Biozone: This fossil comes from the Macdonnelli Subzone and Raricostatum Zone of the Obtusum Zone, which are vital in understanding the marine biodiversity of the Lower Jurassic period. Fossils from this zone provide critical insights into the diversification of ammonites and other marine species during this important geological time. Fossil Features: Family: Ammonitidae Super Family: Ammonoidea Order: Ammonitida Morphology: The Pleuroceras spinatum ammonite features a distinctive, tightly coiled shell with smooth ribs. The shell exhibits evolute coiling, with the whorls becoming larger as the ammonite matured. The ribs are evenly spaced and well-defined, adding a textural feature to the shell’s surface. The multi-block nature of this specimen showcases multiple ammonites preserved together, giving a rare and unique glimpse into the marine ecosystem of the Lower Jurassic. The suture lines are well-preserved and visible, which are crucial for understanding the ammonite’s evolutionary development. Notable Details: This fossil is 100% GENUINE and comes with a Certificate of Authenticity, ensuring its authenticity and historical value. The specimen has been carefully selected for its high-quality preservation. The photograph provided shows the actual specimen you will receive, ensuring transparency in your purchase. Scale Rule: The scale rule squares/cube shown in the photo represents 1cm, allowing you to accurately gauge the size of the fossil. Full sizing details are available in the photograph. Condition: This Pleuroceras spinatum Fossil Ammonite Multi Block is in excellent condition, showcasing its distinctive ribbing, evolute shell, and well-preserved suture lines. The fossil has been cleaned and treated for display, making it an ideal addition to any Jurassic ammonite collection or for those interested in the marine life of the Lower Lias.