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- Elephant_and_mammoth_ivory abstract "Elephant and mammoth tusk ivory comes from the two modified upper incisors of extant and extinct members of the order Proboscidea. Mammoths have been extinct on mainlands for 10,000 years, and on islands for 4,000 years. Because of the geographical range in Alaska and Siberia, Mammuthus primigenius tusks have been well preserved. Therefore, Mammuthus primigenius is the only extinct Proboscidea which consistently provides high quality, carvable ivory.An African elephant tusk can grow to 3.5 metres in length. Enamel is only present in the tusk tip in young animals. It is soon worn off and not replaced. Whole cross-sections of proboscidean tusks are rounded or oval. Dentine composes 95% of the tusk and will sometimes display broad concentric bands. Cementum, which can be thick in extinct genera, covers the outside of the tusk. Cementum can present a layered appearance, particularly in mammoth.Polished cross-sections of elephant and mammoth ivory dentine display uniquely characteristic Schreger lines. Schreger lines are commonly referred to as cross-hatchings, engine turnings, or stacked chevrons. Schreger lines can be divided into two categories. The easily seen lines which are closest to the cementum are the outer Schreger lines. The faintly discernible lines found around the tusk nerve or pulp cavities are the inner Schreger lines. The intersections of Schreger lines form angles. These Schreger angles appear in two forms: concave angles and convex angles. Concave angles have slightly concave sides and open to the medial (inner) area of the tusk. Convex angles have somewhat convex sides and open to the lateral (outer) area of the tusk. Outer Schreger angles, both concave and convex, are acute in extinct proboscidea and obtuse in extant proboscidea.China was the biggest market for poached ivory but announced they would phase out the legal domestic manufacture and sale of ivory products in May, 2015, and in September 2015 China and the U.S.A. "said they would enact a nearly complete ban on the import and export of ivory." [1].".
- Elephant_and_mammoth_ivory thumbnail ADIM_6298_big.JPG?width=300.
- Elephant_and_mammoth_ivory wikiPageExternalLink legalauctions.asp.
- Elephant_and_mammoth_ivory wikiPageExternalLink china-and-us-agree-on-ivory-ban-in-bid-to-end-illegal-trade-globally.
- Elephant_and_mammoth_ivory wikiPageID "97784".
- Elephant_and_mammoth_ivory wikiPageLength "2809".
- Elephant_and_mammoth_ivory wikiPageOutDegree "18".
- Elephant_and_mammoth_ivory wikiPageRevisionID "682902238".
- Elephant_and_mammoth_ivory wikiPageWikiLink Alaska.
- Elephant_and_mammoth_ivory wikiPageWikiLink Category:Ivory.
- Elephant_and_mammoth_ivory wikiPageWikiLink Cementum.
- Elephant_and_mammoth_ivory wikiPageWikiLink Concave_angle.
- Elephant_and_mammoth_ivory wikiPageWikiLink Convex_angle.
- Elephant_and_mammoth_ivory wikiPageWikiLink Dentin.
- Elephant_and_mammoth_ivory wikiPageWikiLink Dentine.
- Elephant_and_mammoth_ivory wikiPageWikiLink File:ADIM_6298_big.JPG.
- Elephant_and_mammoth_ivory wikiPageWikiLink Incisor.
- Elephant_and_mammoth_ivory wikiPageWikiLink Incisors.
- Elephant_and_mammoth_ivory wikiPageWikiLink Ivory.
- Elephant_and_mammoth_ivory wikiPageWikiLink Ivory_trade.
- Elephant_and_mammoth_ivory wikiPageWikiLink Mammoth.
- Elephant_and_mammoth_ivory wikiPageWikiLink Mammuthus_primigenius.
- Elephant_and_mammoth_ivory wikiPageWikiLink Order_(biology).
- Elephant_and_mammoth_ivory wikiPageWikiLink Proboscidan.
- Elephant_and_mammoth_ivory wikiPageWikiLink Proboscidea.
- Elephant_and_mammoth_ivory wikiPageWikiLink Schreger_line.
- Elephant_and_mammoth_ivory wikiPageWikiLink Siberia.
- Elephant_and_mammoth_ivory wikiPageWikiLink Tooth_enamel.
- Elephant_and_mammoth_ivory wikiPageWikiLink Woolly_mammoth.
- Elephant_and_mammoth_ivory wikiPageWikiLinkText "Elephant and mammoth ivory".
- Elephant_and_mammoth_ivory wikiPageWikiLinkText "elephant ivory".
- Elephant_and_mammoth_ivory wikiPageWikiLinkText "ivory tusk".
- Elephant_and_mammoth_ivory wikiPageWikiLinkText "ivory".
- Elephant_and_mammoth_ivory wikiPageWikiLinkText "mammoth ivory".
- Elephant_and_mammoth_ivory hasPhotoCollection Elephant_and_mammoth_ivory.
- Elephant_and_mammoth_ivory wikiPageUsesTemplate Template:Reflist.
- Elephant_and_mammoth_ivory subject Category:Ivory.
- Elephant_and_mammoth_ivory comment "Elephant and mammoth tusk ivory comes from the two modified upper incisors of extant and extinct members of the order Proboscidea. Mammoths have been extinct on mainlands for 10,000 years, and on islands for 4,000 years. Because of the geographical range in Alaska and Siberia, Mammuthus primigenius tusks have been well preserved.".
- Elephant_and_mammoth_ivory label "Elephant and mammoth ivory".
- Elephant_and_mammoth_ivory sameAs m.0p515.
- Elephant_and_mammoth_ivory sameAs ඇත්_දළ_සහ_මැමත්_දළ.
- Elephant_and_mammoth_ivory sameAs Q5359384.
- Elephant_and_mammoth_ivory sameAs Q5359384.
- Elephant_and_mammoth_ivory wasDerivedFrom Elephant_and_mammoth_ivory?oldid=682902238.
- Elephant_and_mammoth_ivory depiction ADIM_6298_big.JPG.
- Elephant_and_mammoth_ivory isPrimaryTopicOf Elephant_and_mammoth_ivory.