Promicroceras planicosta (Reynès, 1879) – Calcite Ammonite Fossil Expansion and supports clarity of purpose

and supports clarity of purpose

and spiritual sensitivity

honest communication

calm and compassion

Phenakite Mineral Specimen is a highly sought-after crystal

Promicroceras planicosta (Reynès, 1879) – Calcite Ammonite Fossil Expansion and supports clarity of purposeA 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