Description
Pseudodiadema depressum Regular Echinoid Fossil – Oxfordian Stage, Late Jurassic, Cricqueboeuf, Normandy, France
This fine fossil specimen represents Pseudodiadema depressum, a regular echinoid (sea urchin) from the Oxfordian stage of the Late Jurassic, approximately 159 to 154 million years ago. It was recovered from the fossil-rich marine limestone beds of Cricqueboeuf, a renowned site in Normandy, northern France.
Fossil Type & Species:
- Type: Invertebrate Fossil (Regular Echinoid / Sea Urchin)
- Species: Pseudodiadema depressum
- Phylum: Echinodermata
- Class: Echinoidea
- Order: Cidaroida
- Superfamily: Pseudodiadematoidea
- Family: Pseudodiadematidae
- Described by: Cotteau, 1863
Geological & Stratigraphic Details:
- Location: Cricqueboeuf, Calvados, Normandy, France
- Formation: Oxfordian marine limestones
- Geological Stage: Oxfordian (Upper Jurassic)
- Age: ~159–154 million years ago
- Biozone: Perisphinctes ammonite zone (regional correlation)
- Depositional Environment: Shallow marine carbonate platform with calm, warm seas; ideal for the preservation of delicate echinoid shells in fine-grained limestones
Morphology & Features: This Pseudodiadema depressum specimen features:
- Sub-hemispherical, symmetrical test with clear ambital outline
- Densely arranged primary and secondary tubercles forming a detailed lattice across the shell
- Well-developed ambulacral and interambulacral zones, sometimes showing fine pore structures
- No spines attached, but tubercle structure suggests strong spine-bearing capability
- Subtle colour variations from beige to pale brown, depending on matrix contact
Notable: Pseudodiadema depressum is a classic species of Jurassic echinoid used in palaeoenvironmental and biostratigraphic studies. Its compact test and distinctive tubercle patterning make it both scientifically important and visually appealing.
Specimen Details:
- Origin: Cricqueboeuf, Normandy, France
- Species: Pseudodiadema depressum
- Fossil Type: Echinoid Shell (Regular Sea Urchin)
- Geological Stage: Oxfordian, Late Jurassic
- Size Reference: Scale rule square = 1cm (please refer to the listing photo for full size)
- Note: You will receive the exact specimen shown in the photographs
Authenticity & Quality: All our fossils are genuine and professionally selected. This specimen includes a Certificate of Authenticity. No restorations or artificial enhancements are applied.
Why Choose This Fossil? Perfect for:
- Fossil and echinoderm collectors
- Academic and educational purposes
- Natural history displays
- Unique gifts with palaeontological value
Shipping & Packaging: Eco-conscious packaging and tracked global shipping ensure secure and swift delivery. Each fossil is packed with care to preserve detail and structure.
Own a finely preserved sea urchin from the Jurassic oceans of France with this authentic Pseudodiadema depressum echinoid fossil.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
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