Promicroceras planicosta (Reynès, 1879) – Calcite-Replaced Ammonite
Lower Lias (Obtusum Zone), Lower Jurassic | Charmouth, Lyme Regis, Dorset, UK

A well-preserved, fully calcite-replaced specimen of Promicroceras planicosta, exhibiting fine ribbing and characteristic planispiral coiling. This taxon is diagnostic of the lower part of the Obtusum Zone (Sinemurian Stage), and is a key index fossil within the Lower Jurassic ammonite biostratigraphy of the UK.

• Stratigraphic Context: Obtusum Zone, Lower Lias Group

• Chronostratigraphy: Lower Jurassic, Sinemurian (~200 Ma)

• Provenance: Charmouth Foreshore, Lyme Regis, Dorset, England (UK Jurassic Coast, UNESCO World Heritage Site)

• Preservation: Calcite-replaced shell with excellent morphological detail

• Ammonite Diameter: 2.5 cm (1 inch)

Each specimen is supplied with a species and locality identification label. All specimens are hand-selected to meet high standards suitable for research or curated display.

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