Description
Leioceras Ammonite & Lima gigantea Bivalve Fossil – A Unique Jurassic Pair
This rare fossil block contains both a beautifully preserved Leioceras ammonite and a large Lima gigantea bivalve, both naturally associated within the same matrix. Collected from the iconic Burton Bradstock site on the Jurassic Coast of Dorset, UK, this piece represents an exceptional snapshot of Jurassic marine life.
Fossil & Geological Information:
- Ammonite Genus: Leioceras
- Family: Leioceratidae
- Superfamily: Hildoceratoidea
- Order: Ammonitida
- Morphological Features: Smooth, involute shell with faint ribbing, rounded venter
- Notable: Commonly used as an index fossil for the Middle Jurassic; streamlined shape suggests active nektonic life
- Bivalve Species: Lima gigantea
- Family: Limidae (File Clams)
- Morphology: Large, strongly ribbed shell with radial ornamentation; known for living partially buried in soft sediment with a large muscular foot
- Ecology: Epifaunal and filter-feeding organism
- Geological Formation: Inferior Oolite
- Stratigraphy: Middle Jurassic, Bajocian Stage (~170–168 million years ago)
- Location: Burton Bradstock, Dorset, UK (Jurassic Coast UNESCO World Heritage Site)
- Depositional Environment: Shallow, warm epicontinental sea with high biodiversity and carbonate sedimentation
- Biozone (Inferred): Leioceras opalinum Zone, a key ammonite biozone of the Bajocian Stage
Specimen Details:
- Block Size: Please see scale cube (1cm) in the photo for accurate dimensions
- Discovery Date: 17 January 2025
- Collected By: Alister and Alison, UKGE Team
- Preparation: Professionally cleaned, consolidated and treated by Alison for optimal preservation
- Photograph: What you see is what you get – actual specimen shown
- Authenticity: Comes with a Certificate of Authenticity from UKGE
Scientific and Collector Relevance:
This fossil block not only features two distinct and well-known Jurassic marine taxa, but it also serves as a mini-ecosystem representation of life in the Bajocian seas. Such natural combinations are uncommon and highly prized by collectors, educators, and palaeontology enthusiasts.
Perfect For:
Fossil collectors, museum-quality displays, educational settings, or as a unique natural history gift. A wonderful opportunity to own a dual fossil specimen from one of the UK’s most fossiliferous formations.
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