Mammoth tusks contain Owen's lines, concentric curved growth bands in dentine resembling tree rings, but on conical tusks the circles tighten toward tips and widen at the base. Schreger lines come from microscopic dentinal tubules following wavy 3D paths; flat cuts through them produce alternating light and dark bands. Two intersecting systems create characteristic diamonds, chevrons, and V-shapes.
Internal ivory structure: Owen's lines and Schreger lines in mammoth tusks
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Key facts
- Owen's lines are incremental growth lines in dentine, appearing as concentric curved bands like tree rings
- Tusk geometry differs from tree trunks because tusks are long cones rather than cylinders
- Tighter Owen's line circles appear toward tusk tips; wider circles toward the base
- Schreger lines are produced by microscopic dentinal tubules following regularly changing wavy 3D courses
- When a flat cut intersects these tubules, alternating light and dark bands form
- Two intersecting systems of bands create characteristic cross-hatched diamond, chevron, and V-shaped patterns
- The paper documents standardized symbolic conventions followed across figurines, indicating structured cultural approaches
Sources
nature.com
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JAIC 1993, Volume 32, Number 3, Article 3 (pp. 241 to 248)cool.culturalheritage.org
by EON ESPINOZA · 1993 · Cited by 129 — Although Owen is clearly associated with the proboscidean ivory pattern, his name was given to a system of concentric dentine growth lines (Miles and White…
2. Tusks and Ivorypocketdentistry.com
The material of a mammoth tusk is known to us by another name – 'ivory'. What Are Tusks? Not everyone realises that tusks are actually teeth.
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Cementum forms a layer surrounding the dentine of tooth and tusk roots. Its main function is to adhere the tooth and tusk root to the mandibular and maxillary ...
Ivory & Tooth - Condition Reportinglam.alaska.gov
This is a cross section of walrus tusk, showing the telltale inner core (looking like oatmeal or marble) of secondary dentine, surrounded by ...
Schreger lineen.wikipedia.org
Schreger lines are visual artifacts that are evident in the cross-sections of ivory. They are commonly referred to as cross-hatchings, engine turnings, ...
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