Promicroceras planicosta (Reynès, 1879) – Calcite Ammonite Fossil grounding and protective stone What’s Inside the Zeolite Crystal

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Promicroceras planicosta (Reynès, 1879) – Calcite Ammonite Fossil grounding and protective stone What’s Inside the Zeolite CrystalA beautifully preserved specimen of Promicroceras planicosta, fully replaced by calcite. This ammonite displays fine ribbing and its characteristic planispiral coiling. As a key index fossil of the Lower Jurassic Sinemurian, Promicroceras is highly significant for ammonite biostratigraphy in the UK. An excellent choice for collectors, researchers, or curated display. Stratigraphic Context Lower Lias Group, Obtusum Zone Chronostratigraphy Lower