Morocco Trilobite Fossil (Diacalymene) – Partial Moult Specimen – 140g (87 × 29 × 49 mm)

This 140g trilobite fossil (genus Diacalymene) originates from the fossil‑rich Ordovician beds of Morocco.
It displays warm beige–brown coloration, natural sandstone matrix, and excellent preservation of the glabella, thorax, and pygidium. The specimen represents a moulted exoskeleton, a common but scientifically valuable form of trilobite preservation.
Dimensions: 87 × 29 × 49 mm.
The cephalon shows the central glabella clearly, while the free cheeks and eyes are absent — typical of moults and consistent with the taphonomy of this deposit. The thoracic segments are well defined, and the pygidium shows the characteristic gentle downward curl seen in many trilobite moults.

AGE
Formed during the Ordovician Period, approximately 449–443 million years ago, when trilobites thrived in warm, shallow marine environments.
This specimen is valued for its educational clarity, natural preservation, and its role in illustrating trilobite moulting behaviour.

Technical notes
• Hardness: ~3 (calcite-based exoskeleton)
• Luster/Finish: Natural matte fossil surface
• Transparency/Preservation: Opaque; partial moult with clear axial features
• Fossil type: Trilobite (Arthropoda)
• Morphology: Distinct glabella, articulated thorax, fused pygidium
• Associations / Matrix: Fine sandstone matrix typical of Moroccan Ordovician beds
• Composition / Formation: Calcite fossilization within sedimentary rock
• Fluorescence: None known
This piece is unpolished, preserving its natural character and making it suitable for display, study, or collection.