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Trilobite - Phacops sp. (Devonian)

Well-preserved fossilized trilobite, likely Phacops, showing segmented body and head embedded in rock matrix. - view 1
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Estimated value

$40 - $150

Rarity

Average(4/10)

Category

Fossils

Era

Devonian Period (419-359 million years ago)

Origin

🌍 International

Artist / Creator

trilobite

Authenticity

High(75%)
40

TRILOBITE - PHACOPS SP. (DEVONIAN): ORIGINS & SIGNIFICANCE

This appears to be a well-preserved, articulated trilobite fossil, likely from the genus Phacops, embedded in a shale or mudstone matrix. The cephalon (head shield) and thorax are clearly visible, exhibiting the characteristic segmented structure and prominent eyes often associated with this genus. The specimen is presented still within its natural rock matrix, indicating a natural preparation style.

LIFE ACROSS EONS

Where This Object Echoes

Paleontological ScienceCambrian to Permian

Trilobites, particularly Phacops, are key index fossils, meaning their presence in rock layers helps geologists date and correlate strata across different regions.

Meaning Through Time

19th Century

Early paleontologists viewed fossils like trilobites as 'medals of creation,' evidence for a divine plan, challenging uniformitarian geological theories.

Modern Era

Trilobites are now understood as critical evidence for evolution and the profound biodiversity of Earth's ancient oceans, teaching us about climate change, plate tectonics, and the history of life.

DEEP-TIME CHRONICLE

Trilobites were an incredibly diverse group of extinct marine arthropods that thrived for over 270 million years, from the Early Cambrian to the end of the Permian period. Phacops, specifically, is a common and iconic genus from the Devonian period, known for its distinctive compound eyes composed ...
Trilobites were an incredibly diverse group of extinct marine arthropods that thrived for over 270 million years, from the Early Cambrian to the end of the Permian period. Phacops, specifically, is a common and iconic genus from the Devonian period, known for its distinctive compound eyes composed of fewer, larger lenses (schizochroal eyes). Their presence provides valuable insight into the ancient marine ecosystems of the Paleozoic Era.

PREHISTORIC SURPRISES

1

Trilobites are one of the earliest known groups of arthropods and were among the first creatures to develop complex eyes, some species having thousands of individual lenses.

2

Despite their ancient lineage, trilobites showed early forms of parental care, with some species fossilized protecting clusters of eggs beneath their head shields.

HOW SCARCE IS IT?

Average55-70%
CommonLegendary

Typical antique shop fare. Requires some searching but regularly available. This is where most genuine antiques fall.

Typical Characteristics

  • Standard antique shop items
  • Regularly available
  • Moderate collector interest

Confidence Factors

  • Trilobites are a commonly faked/restored fossil type due to demand.
  • Without detailed examination, it's hard to rule out composite specimens where parts from different fossils are combined.
How does authenticity detection work?

PALEONTOLOGIST'S TAKE

Paleontology Specialist

Fossil Expert

The clear arthropod segmentation and general morphology strongly point to a trilobite, and the characteristic features are consistent with the Phacops genus. However, without further detail or locality information, a precise species identification is not definitive.

KEY EVIDENCE

  • 1Distinctive segmented thorax and cephalon consistent with trilobite morphology.
  • 2Presence of prominent eyes and general form suggest the genus Phacops.
  • 3Imbedded in a natural rock matrix, indicating geological origin.
  • 4Visible coloration and texture of the fossil material are consistent with permineralization.

UNCERTAINTIES

  • •Exact species identification requires clearer views of specific morphological features, especially the eyes and thoracic segments.
  • •Without UV light or close inspection, it's difficult to ascertain if any minor restoration or enhancement (e.g., crack filling, matrix sculpting) has occurred.

WHAT WOULD IMPROVE CERTAINTY

  • →Clearer, high-resolution photographs from multiple angles, especially of the cephalon and pleura, to aid species-level identification.
  • →A photograph under UV light could help reveal any modern glues or resins used in restoration.
  • →An indication of the fossil's locality and geological formation could significantly refine identification and valuation.
  • →Measurement of the specimen's length.

CONDITION & GRADE

Condition

The trilobite specimen appears largely complete and articulated within its matrix, showing good preservation. There are no obvious signs of significant repair or restoration, and the natural matrix seems undisturbed. Minor erosion or matrix flaking might be present, which is common for geological specimens.

Surface

The surface of the trilobite exoskeleton exhibits a reddish-brown coloration, likely due to iron oxidation within the matrix. The matrix itself appears to be a light grey to tan shale or mudstone, with some minor fracturing visible. The segmentation of the thorax and the contours of the cephalon are well-defined.

Weight & feel

Based on the apparent rock matrix and size, this specimen would feel moderately heavy and dense, typical for a fossil embedded in stone. Likely in the range of 0.5 to 1.5 kilograms.

SPECIMEN MARKET VALUE

$40 - $150

Updated: Feb 26, 2026

  • Market comparables from auctions & retail
  • Condition, completeness & craftsmanship
  • Current collector demand & trends
  • Low = quick sale, high = patient seller

For informational purposes only, not a formal appraisal.

FROM THE CABINET OF

KE

kenmic
Wonderseeker•3 items

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