Description This listing features a rare and scientifically significant fossil specimen of Psiloceras planorbis, a hallmark ammonite species from the earliest part of the Jurassic period, collected in Germany. This ammonite is widely recognised as the first ammonite species to appear after the end-Triassic mass extinction, making it an iconic zonal and index fossil. Geological & Taxonomic Information: Fossil Type: Ammonite (extinct marine cephalopod) Species: Psiloceras planorbis (Sowerby, 1824) Order: Ammonitida Superfamily: Psiloceratoidea Family: Psiloceratidae Geological Stage: Hettangian (Early Jurassic) Age: ~201.3 – 199.3 million years ago Location: Germany Depositional Environment: Shallow marine basin, mudstones and calcareous shales of marine origin Formation: Often associated with Lower Lias equivalents (exact unit varies by region) Stratigraphic & Scientific Importance: Psiloceras planorbis defines the base of the Jurassic System, officially marking the end of the Triassic–Jurassic extinction event and the start of new evolutionary radiation in marine ecosystems. Its distinct appearance and distribution make it critical for biozonation in early Jurassic sediments throughout Europe. Morphological Features: Very evolute shell, with all whorls clearly visible Smooth outer shell with minimal ornamentation, distinguishing it from later more ornate ammonites Rounded whorl section with shallow umbilicus Lack of ribs, tubercles, or keels, giving it a ‘clean’ profile ideal for fossil display Notable Information: This species is a benchmark fossil in European geology and palaeontology. Its smooth appearance and evolutionary placement make it a prized piece for collectors, educational institutions, and museums. Specimen Details: Fossil Origin: Germany Scale: Scale rule squares/cube = 1cm. Please refer to the photo for full sizing. Condition: Excellent preservation; hand-selected for quality and authenticity Photo: The exact fossil specimen you see in the photo is the one you will receive Certification & Authenticity: All of our fossils are 100% genuine and come with a Certificate of Authenticity. Each piece is carefully selected for its scientific and aesthetic value. Whether you are a serious fossil collector, a student of geology, or simply fascinated by prehistoric life, this rare Psiloceras planorbis specimen offers a direct connection to a pivotal chapter in Earth’s evolutionary history.
