Ediacaran Frond-like Organism (Fragment)
Charnia cf. masoni or related frondose rangeomorph • Impression/Cast Body Fossil (Invertebrate/Early Metazoan)
Geological Period
Ediacaran Period (Neoproterozoic Era)
Estimated Age
555 - 541 million years
Preservation Type
Soft-tissue impression / Epirelief casting. Preserved via the 'Death Mask' method where microbial mats stabilized sediment before being smothered by volcanic ash or silt.
Condition Assessment
Fair to Good. The specimen is a partial fragment with significant weathering and lacks the holdfast (basal disc). However, the fractal branching detail is partially discernible in the central section.
Taxonomic Classification
Kingdom: Animalia (incertae sedis); Phylum: Petalonamae; Order: Rangeomorpha; Family: Rangeidae; Genus: cf. Charnia
Morphological Description
Fragmentary impression showing evidence of fractal branching or 'rangeomorph' architecture. Displays a central rachis or midline with primary branches extending laterally. The surface exhibits secondary and tertiary division of the lobes, which is a diagnostic 'quilted' pattern characteristic of Avalonian-type biota.
Rock Matrix
Ferruginous sandstone/siltstone with high iron oxide content (reddish-brown hue), potentially containing volcaniclastic material.
Formation & Location
Likely Mistaken Point (Newfoundland, Canada) or similar Ediacaran sites in Charnwood Forest (UK) or the White Sea region (Russia).
Size & Dimensions
Approximately 4-6 cm in width for the visible fragment; typical full fronds can range from 10 cm to over 1 meter.
Value & Rarity
Estimated Market Value
$150 - $400 USD (highly dependent on verified provenance and legality, as many Ediacaran sites are protected).
Auction Estimate
$200 - $500 USD
Rarity Assessment
Rare. While local deposits may be bedding-plane rich, Ediacaran fossils are geographically restricted and scientifically high-value due to their extreme age.
Scientific Significance
Crucial for understanding the 'Ediacaran Explosion' and the evolution of complex multicellular life. These organisms represent some of the earliest known macroscopic creatures, exhibiting unique growth patterns not seen in modern phyla.
Preparation Recommendations
No further mechanical preparation advised as the impression is superficial. Store in a low-humidity, UV-stabilized environment. Avoid acidic cleaning agents that could degrade the iron-rich matrix.
Notable Features
Distinctive reddish-brown oxidation of the matrix suggests preservation in an oxygen-limited environment subsequently exposed to surface weathering. The 'quilted' fractal morphology is a key indicator of the Rangeomorpha clade.