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Obukhov Formation
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<h2 id="geological-context">Geological context</h2> <p>The <a href="/facts/Late_Eocene/EYgI8Uco">Late Eocene</a> <a href="/facts/Rovno_amber/Aqv4pl2n">Rovno amber</a> is hosted in the Obukhov Formation, and it underlies the <a href="/facts/Early_Oligocene/9o544Kxj">Early Oligocene</a> <a href="/facts/Mezhigorje_Formation/5mVbRGt4">Mezhigorje Formation</a>.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> The formation is found along the northwestern margin of the <a href="/facts/Ukrainian_Crystalline_Shield/8dSPrzou">Ukrainian Crystalline Shield</a><a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> exposed in the Rivne region of Ukraine and across the border near <a href="/facts/Rechitsa/l0LMB2n1">Rechitsa</a> in the <a href="/facts/Gomel_Region/jc6vJYpd">Gomel Region</a> of <a href="/facts/Belarus/vweHwgob">Belarus</a>.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> The granite <a href="/facts/Basement_rock/nThFlUPv">basement rock</a> was overlain by sandy to clayey deposits that were host to alluvial amber.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> </p><p>The two formations total between 2–7 m (6.6–23.0 ft) in thickness, both containing interbeds or mixtures of <a href="/facts/Brown_coal/pGFaDtFa">brown coals</a> and carbonized vegetation. Both formations are sandy to clayey in texture, with the Obukhov Formation having more clayey <a href="/facts/Glauconite/Uq6Yv3Kb">glauconite</a>-<a href="/facts/Quartz/4n86tE2G">quartz</a> plus sandy <a href="/facts/Loess/VpFUed3E">loess</a>.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Engel, M.S.; Perkovsky, E.E. (2006). "An Eocene bee in Rovno amber, Ukraine (Hymenoptera, Megachilidae)" (PDF). American Museum Novitates (3506): 1–11. doi:10.1206/0003-0082(2006)506[0001:aebira]2.0.co;2. S2CID 84073810. <a href="http://digitallibrary.amnh.org/bitstream/handle/2246/5685/N3506.pdf?sequence=1" target="_blank">http://digitallibrary.amnh.org/bitstream/handle/2246/5685/N3506.pdf?sequence=1</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Perkovsky, E. E.; Zosimovich, V. Y.; Vlaskin, A. P. (2010). "Chapter 7: Rovno amber". In Penney, D. (ed.). Biodiversity of Fossils in Amber from the Major World Deposits. Siri Scientific Press. pp. 116–136. ISBN 978-0-9558636-4-6. <a href="978-0-9558636-4-6" target="_blank">978-0-9558636-4-6</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Perkovsky, E. E.; Zosimovich, V. Y.; Vlaskin, A. P. (2010). "Chapter 7: Rovno amber". In Penney, D. (ed.). Biodiversity of Fossils in Amber from the Major World Deposits. Siri Scientific Press. pp. 116–136. ISBN 978-0-9558636-4-6. <a href="978-0-9558636-4-6" target="_blank">978-0-9558636-4-6</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Perkovsky, E. E.; Rasnitsyn, A. P.; Vlaskin, A. P.; Taraschuk, M. V. (2007). "A comparative analysis of the Baltic and Rovno amber arthropod faunas: representative samples". African Invertebrates. 48 (1): 229–245. <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Perkovsky, E. E.; Zosimovich, V. Y.; Vlaskin, A. P. (2010). "Chapter 7: Rovno amber". In Penney, D. (ed.). Biodiversity of Fossils in Amber from the Major World Deposits. Siri Scientific Press. pp. 116–136. ISBN 978-0-9558636-4-6. <a href="978-0-9558636-4-6" target="_blank">978-0-9558636-4-6</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Engel, M.S.; Perkovsky, E.E. (2006). "An Eocene bee in Rovno amber, Ukraine (Hymenoptera, Megachilidae)" (PDF). American Museum Novitates (3506): 1–11. doi:10.1206/0003-0082(2006)506[0001:aebira]2.0.co;2. S2CID 84073810. <a href="http://digitallibrary.amnh.org/bitstream/handle/2246/5685/N3506.pdf?sequence=1" target="_blank">http://digitallibrary.amnh.org/bitstream/handle/2246/5685/N3506.pdf?sequence=1</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Perkovsky, E. E. (2017). "Rovno Amber Caddisflies (Insecta, Trichoptera) from Different Localities, with Information about three New Sites". Vestnik Zoologii. 51 (1): 15–22. doi:10.1515/vzoo-2017-0003. <a href="https://doi.org/10.1515%2Fvzoo-2017-0003" target="_blank">https://doi.org/10.1515%2Fvzoo-2017-0003</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Perkovsky, E. E.; Zosimovich, V. Y.; Vlaskin, A. P. (2010). "Chapter 7: Rovno amber". In Penney, D. (ed.). Biodiversity of Fossils in Amber from the Major World Deposits. Siri Scientific Press. pp. 116–136. ISBN 978-0-9558636-4-6. <a href="978-0-9558636-4-6" target="_blank">978-0-9558636-4-6</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Perkovsky, E. E.; Zosimovich, V. Y.; Vlaskin, A. P. (2003). "A Rovno amber fauna: a preliminary report". Acta Zoologica Cracoviensia. 46(Supplemental): 423–430. <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> </ol>