Parkinsonia acris Fossil Ammonite – Bajocian Jurassic – Calvados France – Genuine Fossil with Certificate

Description This listing is for a genuine Parkinsonia acris fossil ammonite from the Bajocian Stage of the Middle Jurassic, discovered in Calvados, Normandy, France. This well-preserved ammonite showcases classic morphological features of the genus and is a representative of one of the most diagnostic ammonite taxa of its time. The photograph shows the exact specimen you will receive, with a 1cm scale cube for accurate sizing. Please refer to the photo for full dimensions. Fossil Type & Classification: Species: Parkinsonia acris Type: Fossil Ammonite (extinct marine cephalopod) Order: Ammonitida Superfamily: Stephanoceratoidea Family: Parkinsoniidae Formally Described By: S.S. Buckman, 1921 Phylum: Mollusca Class: Cephalopoda Geological & Stratigraphic Information: Period: Jurassic Epoch: Middle Jurassic Stage: Bajocian Formation/Locality: Found in Bajocian marine strata near Calvados, Normandy, France Depositional Environment: Shallow epicontinental marine shelf with soft marine sediments, ideal for ammonite preservation Biozone Association: Parkinsonia Zone – used extensively in biostratigraphy of the Bajocian Significance: Parkinsonia acris is an important zonal fossil, used to date and correlate Jurassic rocks across Europe Morphology & Features: Strongly ribbed shell with bifurcating ribs that arise at the umbilical shoulder Planispiral coiling and an open umbilicus, typical of the genus Parkinsonia Ornamentation includes radial ribs and tubercles near the ventrolateral shoulder Often preserved in limestone or marl with fine suture patterns visible under light Scientific & Collector Notes: Parkinsonia acris is a key marker species for the late Bajocian and is a notable index fossil Calvados is a classic locality for Jurassic ammonites and yields excellent quality fossils These ammonites were fast-swimming predators or scavengers in warm, shallow seas An excellent specimen for any fossil collector, palaeontology student, or geology enthusiast Why Buy From Us? 100% authentic fossil, ethically sourced Comes with a Certificate of Authenticity You will receive the exact specimen shown Perfect for display, study, or educational collections This striking Parkinsonia acris fossil ammonite from the Bajocian of Calvados, France is both a scientifically important specimen and a stunning natural relic from the Jurassic seas of Europe.