NEW FINDINGS OF LOWER CAMBRIAN TRILOBITES IN THE SOUTHERN HOVSGOL AREA (Mongolia) AND THEIR SIGNIFICANCE FOR STRATIGRAPHY AND INTERREGIONAL CORRELATION
I.V. Korovnikov1,2, F.D. Lazarev1,2
1Novosibirsk State University, ul. Pirogova 1, Novosibirsk, 630090, Russia
2Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
Keywords: Lower Cambrian, trilobites, biostratigraphy, southern Hovsgol area (Mongolia)
Abstract
Based on the materials collected by L.N. Repina in the southern Hövsgöl area (Mongolia) in 1986-1988, we describe three sections and identify lower Cambrian trilobites. The sections of Mt. Hurtel Harna and along the Ujigin Gol River were studied earlier. We consider trilobites that have been found in these sections for the first time: Redlihia zharkovi , Lermontoviella shanganica , Erbia granulosa , Kootenia siberica , and Parapoulsenia lata . The section along the ravine of the Zuun-Shuvuutyn-Sair Brook and the findings of trilobites in it are described for the first time. The found new trilobites make it possible to correlate the coeval lower Cambrian strata in the southern Hövsgöl area, Altai-Sayan folded area, and western Siberian Platform and refine the age of the certain parts of the Egyin Gol, Ukhaa Tolgoi, and Ujigin Gol formations.
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