Hagfish or Invertebrate Burrow Cast (Glossifungites ichnofacies) / Weathered Limestone Geifact
Uncertain; possibly trace fossil burrow system or non-fossiliferous limestone eroded by differential weathering and solution (karst processes) • Trace fossil (Ichnofossil) or geological weathering feature (geofact/solution feature), potentially a burrow cast
Geological Period
Cretaceous
Estimated Age
100 to 66 million years
Preservation Type
Silicification or complete replacement/lithification within a limestone matrix, showing extensive surface weathering and rounding
Condition Assessment
Good natural condition, showing heavy weathering, smooth patination, and a complete natural perforation with no recent human modification evident
Taxonomic Classification
Ichnogenus cf. Thalassinoides or Ophiomorpha (if trace fossil); or Inanimate Geological Object (Geofact)
Morphological Description
Irregular, smooth, weathered brownish limestone nodule featuring a distinct, nearly circular natural perforation or hole passing entirely through a constricted portion of the body, with smooth, rounded contours typical of water-worn or chemically weathered rock.
Rock Matrix
Cretaceous limestone (likely Edwards Group or associated regional carbonate formations of central Texas)
Formation & Location
Kerr County, Texas, USA (Edwards Plateau region)
Size & Dimensions
Approximately 10-15 cm in maximum length, estimated by comparison with the adjacent US nickel coin (21.21 mm diameter)
Value & Rarity
Estimated Market Value
$10 - $30
Auction Estimate
$0 - $20
Rarity Assessment
Common (Geological curiosity / non-fossil or common trace weathering feature)
Scientific Significance
Demonstrates local hydrological and chemical weathering processes in Cretaceous carbonates of the Texas Hill Country; if verified as an ichnofossil, it provides insight into ancient benthic organism bioturbation.
Preparation Recommendations
No preparation required; wash gently with water and a soft brush to remove surface dust. Store in a dry environment.
Notable Features
The presence of a perfectly natural, smooth-bored circular hole passing through the middle of an organically shaped limestone mass, giving it an unusual, artifact-like appearance despite being naturally formed.
Notes
Kerr county Texas