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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">litosphere</journal-id><journal-title-group><journal-title xml:lang="ru">Литосфера</journal-title><trans-title-group xml:lang="en"><trans-title>LITHOSPHERE (Russia)</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1681-9004</issn><issn pub-type="epub">2500-302X</issn><publisher><publisher-name>A.N. Zavaritsky Institute of Geology and Geochemistry</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">litosphere-173</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Лимитотипы нижней границы сакмарского и артинского ярусов на Урале</article-title><trans-title-group xml:lang="en"><trans-title>Limitotipes of Lower Sakmarian and Artinskian stages boundary in the Urals</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Черных</surname><given-names>Валерий Владимирович</given-names></name><name name-style="western" xml:lang="en"><surname>Chernykh</surname><given-names>V. V.</given-names></name></name-alternatives><email xlink:type="simple">chernykh@igg.uran.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чувашов</surname><given-names>Борис Иванович</given-names></name><name name-style="western" xml:lang="en"><surname>Chuvashov</surname><given-names>B. I.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт геологии и геохимии УрО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Geology and Geochemistry, Urals Branch of RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2015</year></pub-date><pub-date pub-type="epub"><day>28</day><month>02</month><year>2015</year></pub-date><volume>0</volume><issue>1</issue><fpage>35</fpage><lpage>52</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Черных В.В., Чувашов Б.И., 2015</copyright-statement><copyright-year>2015</copyright-year><copyright-holder xml:lang="ru">Черных В.В., Чувашов Б.И.</copyright-holder><copyright-holder xml:lang="en">Chernykh V.V., Chuvashov B.I.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.lithosphere.ru/jour/article/view/173">https://www.lithosphere.ru/jour/article/view/173</self-uri><abstract><p>Разрез Усолка и дублирующий его разрез Дальний Тюлькас (Башкортостан) предлагаются в качестве стратотипов соответственно нижней границы сакмарского яруса и нижней границы артинского яруса Международной стратиграфической шкалы. Приведено описание разрезов с указанием уровней находок конодонтов, фузулинид и аммоноидей, а также результатов изучения U-Pb геохронологии, изотопии стронция, углерода и кислорода.</p></abstract><trans-abstract xml:lang="en"><p>The section Usolka and duplicating its section Dal’ny Tulkas (Bashkortostan) are proposed as the stratotypes of the Lower Sakmarian stage boundary and Lower Artinskian stage boundary of the International Stratigraphic scale. We give the description of sections with the indication of conodont, fusulinid and ammonoid level findings and the results of studying U-Pb geochronology as well as Sr, C, O isotopes.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>стратотип границы</kwd><kwd>сакмарский ярус</kwd><kwd>артинский ярус</kwd><kwd>конодонты</kwd><kwd>фузулиниды</kwd><kwd>аммоноидеи</kwd><kwd>Урал</kwd><kwd>the stratotype of a boundary</kwd><kwd>Sakmarian stage</kwd><kwd>Artinskian stage</kwd><kwd>conodonts</kwd><kwd>fusulinids</kwd><kwd>ammonoids</kwd><kwd>the Urals</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Черных В.В. (2006) Нижнепермские конодонты Урала. Екатеринбург: ИГГ УрО РАН, 130 с.</mixed-citation><mixed-citation xml:lang="en">Черных В.В. (2006) Нижнепермские конодонты Урала. 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