https://yusupov.cloud/index.php?action=history&feed=atom&title=Schreger_linesSchreger lines - Revision history2026-05-16T13:28:38ZRevision history for this page on the wikiMediaWiki 1.44.0https://yusupov.cloud/index.php?title=Schreger_lines&diff=296&oldid=prevMvuijlst at 11:43, 20 October 20252025-10-20T11:43:01Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Schreger lines in mammoth ivory.jpg|alt=From http://www.lab.fws.gov/Ivory/elephant.html|thumb|'''Schreger lines in mammoth ivory''']]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Schreger lines in mammoth ivory.jpg|alt=From http://www.lab.fws.gov/Ivory/elephant.html|thumb|'''Schreger lines in mammoth ivory''']]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Schreger lines''' are visual artifacts that are evident in the cross-sections of [[ivory]].<ref></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Schreger lines''' are visual artifacts that are evident in the cross-sections of [[ivory]].<ref></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> Espinoza, Edgard O'Neil; Mann, Mary-Jacque (1991). The identification guide for ivory and ivory substitutes. p. 10.<del style="font-weight: bold; text-decoration: none;">}}</del></ref> They 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, which 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.<ref><del style="font-weight: bold; text-decoration: none;">{{Cite web|url=</del>https://web.archive.org/web/20190214103227/http://www.fws.gov/lab/ivory_natural.php#elephant <del style="font-weight: bold; text-decoration: none;">|title=</del>Ivory Identification Guide <del style="font-weight: bold; text-decoration: none;">|author=US Fish and Wildlife Service}}</del></ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> Espinoza, Edgard O'Neil; Mann, Mary-Jacque (1991). <ins style="font-weight: bold; text-decoration: none;">''</ins>The identification guide for ivory and ivory substitutes<ins style="font-weight: bold; text-decoration: none;">''</ins>. p. 10.</ref> They 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, which 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.<ref><ins style="font-weight: bold; text-decoration: none;">US Fish and Wildlife Service. "[</ins>https://web.archive.org/web/20190214103227/http://www.fws.gov/lab/ivory_natural.php#elephant Ivory Identification Guide<ins style="font-weight: bold; text-decoration: none;">]".</ins></ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Notes ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Notes ==</div></td></tr>
</table>Mvuijlsthttps://yusupov.cloud/index.php?title=Schreger_lines&diff=295&oldid=prevMvuijlst at 11:41, 20 October 20252025-10-20T11:41:30Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Schreger lines in mammoth ivory.jpg|alt=From http://www.lab.fws.gov/Ivory/elephant.html|thumb|'''Schreger lines in mammoth ivory''']]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Schreger lines in mammoth ivory.jpg|alt=From http://www.lab.fws.gov/Ivory/elephant.html|thumb|'''Schreger lines in mammoth ivory''']]</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''Schreger lines''' are visual artifacts that are evident in the cross-sections of [[ivory]].<ref><del style="font-weight: bold; text-decoration: none;">{{cite book|last1=</del>Espinoza<del style="font-weight: bold; text-decoration: none;">|first1=</del>Edgard O'Neil<del style="font-weight: bold; text-decoration: none;">|last2=</del>Mann<del style="font-weight: bold; text-decoration: none;">|first2=</del>Mary-Jacque<del style="font-weight: bold; text-decoration: none;">|title=</del>The identification guide for ivory and ivory substitutes<del style="font-weight: bold; text-decoration: none;">|date=1991|page=</del>10}}</ref> They 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, which 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.<ref>{{Cite web|url=https://web.archive.org/web/20190214103227/http://www.fws.gov/lab/ivory_natural.php#elephant |title=Ivory Identification Guide |author=US Fish and Wildlife Service}}</ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''Schreger lines''' are visual artifacts that are evident in the cross-sections of [[ivory]].<ref></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> </ins>Espinoza<ins style="font-weight: bold; text-decoration: none;">, </ins>Edgard O'Neil<ins style="font-weight: bold; text-decoration: none;">; </ins>Mann<ins style="font-weight: bold; text-decoration: none;">, </ins>Mary-Jacque <ins style="font-weight: bold; text-decoration: none;">(1991). </ins>The identification guide for ivory and ivory substitutes<ins style="font-weight: bold; text-decoration: none;">. p. </ins>10<ins style="font-weight: bold; text-decoration: none;">.</ins>}}</ref> They 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, which 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.<ref>{{Cite web|url=https://web.archive.org/web/20190214103227/http://www.fws.gov/lab/ivory_natural.php#elephant |title=Ivory Identification Guide |author=US Fish and Wildlife Service}}</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Notes ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Notes ==</div></td></tr>
</table>Mvuijlsthttps://yusupov.cloud/index.php?title=Schreger_lines&diff=294&oldid=prevMvuijlst at 11:40, 20 October 20252025-10-20T11:40:30Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 11:40, 20 October 2025</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Schreger lines in mammoth ivory.jpg|alt=From http://www.lab.fws.gov/Ivory/elephant.html|thumb|'''Schreger lines in mammoth ivory''']]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Schreger lines in mammoth ivory.jpg|alt=From http://www.lab.fws.gov/Ivory/elephant.html|thumb|'''Schreger lines in mammoth ivory''']]</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">'''Schreger lines''' are visual artifacts that are evident in the cross-sections of [[ivory]].<ref>{{cite book|last1=Espinoza|first1=Edgard O'Neil|last2=Mann|first2=Mary-Jacque|title=The identification guide for ivory and ivory substitutes|date=1991|page=10}}</ref> They 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, which 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.<ref>{{Cite web|url=https://web.archive.org/web/20190214103227/http://www.fws.gov/lab/ivory_natural.php#elephant |title=Ivory Identification Guide |author=US Fish and Wildlife Service}}</ref></ins></div></td></tr>
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</table>Mvuijlsthttps://yusupov.cloud/index.php?title=Schreger_lines&diff=293&oldid=prevMvuijlst: Created page with "'''Schreger lines in mammoth ivory'''"2025-10-20T11:39:57Z<p>Created page with "<a href="/wiki/File:Schreger_lines_in_mammoth_ivory.jpg" title="File:Schreger lines in mammoth ivory.jpg">alt=From http://www.lab.fws.gov/Ivory/elephant.html|thumb|'''Schreger lines in mammoth ivory'''</a>"</p>
<p><b>New page</b></p><div>[[File:Schreger lines in mammoth ivory.jpg|alt=From http://www.lab.fws.gov/Ivory/elephant.html|thumb|'''Schreger lines in mammoth ivory''']]</div>Mvuijlst