Crinoid Stem Fragments (Sea Lillies)
Indeterminate crinoid morphospecies (cf. Encrinus or cf. Platycrinites based on commonality) • Body fossil; Invertebrate (Echinoderm)
Geological Period
Likely Mississippian/Pennsylvanian Subperiods (Carboniferous) or Devonian
Estimated Age
Approx. 300 to 400 million years old
Preservation Type
Recrystallization/Permineralization; the original calcium carbonate has likely been replaced by calcite or silica.
Condition Assessment
Fair to Good; specimens show significant weathering and erosion, losing some fine surface detail but retaining structural diagnostic features.
Taxonomic Classification
Phylum: Echinodermata, Class: Crinoidea, Order: Uncertain (Fragmentary), Family: Uncertain, Genus: Indeterminate
Morphological Description
Small cylindrical segments known as columnals. Visible features include a circular to sub-circular cross-section and distinct crenellae (radially arranged ridges) on the articular surfaces where the ossicles joined.
Rock Matrix
Individual weathered specimens; likely derived from a limestone or calcareous shale matrix based on the tan-buff coloration.
Formation & Location
Common in numerous Paleozoic formations globally, notably the Burlington Limestone (USA) or Carboniferous limestone districts of the UK and Europe.
Size & Dimensions
Approximately 5-8mm in diameter; small fragmented segments consisting of 1-3 articulated columnals.
Value & Rarity
Estimated Market Value
$1 - $5 USD (Commonly sold in bulk 'grab bags' or as minor curiosities).
Auction Estimate
$20 - $40 USD for a large bulk lot of several hundred similar pieces.
Rarity Assessment
Common; crinoid fragments are among the most abundant Paleozoic fossils found worldwide.
Scientific Significance
Crinoids are vital index fossils for Paleozoic stratigraphy and provide high-resolution data regarding ancient shallow-marine carbonate environments and benthic community structures.
Preparation Recommendations
Minimal preparation required. Can be gently cleaned with a soft brush and water. Long-term storage in a dry environment to prevent mechanical weathering.
Notable Features
Distinct 'gear-like' appearance of the ossicle edges which represent the interlocking mechanism of the living animal's stalk.