Coelacanth Scale Plate / Fossil Fish Remains
Sarcopterygii indet. cf. Diplocercides or similar early lobe-finned fish • Body fossil, vertebrate remains consisting of articulated dermal scales and possibly cranial elements
Geological Period
Devonian to Cretaceous (commonly associated with Carboniferous-Permian or Devonian fossil fish plates)
Estimated Age
Approximately 360 to 400 million years old (Devonian period context)
Preservation Type
Permineralization and replacement with iron oxides / calcium phosphate, preserved in a flattened compression-impression matrix
Condition Assessment
Good. The central squamation is well-articulated and clear, though there is surface weathering, minor fracturing, and patches of missing scale material replaced by lighter matrix minerals.
Taxonomic Classification
Phylum: Chordata, Subphylum: Vertebrata, Class: Sarcopterygii, Subclass: Actinistia / Dipnoi, Order: Coelacanthiformes
Morphological Description
The specimen exhibits a distinctive geometric mosaic pattern of interlocking, rectangular to rhomboid dermal scales. The scales show fine parallel striations and ridges, tightly articulated in a continuous plate section. A denser, more disturbed cranial or structural bony element is visible at the apical end.
Rock Matrix
Iron-stained fine-grained sandstone or micaceous siltstone with distinct reddish-brown oxide weathering
Formation & Location
Old Red Sandstone Continent deposits (such as the Orcadian Basin in Scotland or similar Devonian fluviolacustrine sequences)
Size & Dimensions
Approximately 10-15 cm in length, consistent with medium-sized Paleozoic sarcopterygian fishes
Value & Rarity
Estimated Market Value
$150 - $400 USD
Auction Estimate
$200 - $500 USD
Rarity Assessment
Uncommon to Rare. While fish scales occur, well-articulated mosaic plates of lobe-finned fish in this preservation state are sought after by collectors.
Scientific Significance
Provides valuable insight into early lobe-finned fish anatomy, squamation evolution, and the transition of vertebrate skeletal structures in ancient aquatic ecosystems.
Preparation Recommendations
Mechanical cleaning using fine pin vices under a microscope to remove excess matrix. Stabilize exposed fragile bone with a dilute polyvinyl butyral (PVB) or Paraloid B-72 consolidant. Store in a stable, low-humidity environment.
Notable Features
The remarkable basket-weave or mosaic tiling appearance of the overlapping dermal scales creates a striking visual pattern unique to ancient sarcopterygians.