The Lower–Middle Ordovician boundary in Kazakhstan

• Igor F. Nikitin ^[1] ; Tatjana N. Koren ^[2] ; Olga I. Nikitina ^[1] ; Leonid E. Popov ^[3] ; A. M. Zhilkaidarov ^[4]
  1. [1] K.I. Satpaev Geological Institute, Almaty, Kazakhstan Republic
  2. [2] A.P. Karpinskii All–Russian Geological Research Institute, St. Petersburg, Russia
  3. [3] Department of Geology, National Museum and Galleries of Wales, Cardiff, Wales, UK
  4. [4] Committee for Geology and Protection of Mineral Resources, Kokshetau, Kazakhstan Republic

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• Localización: Serie correlación geológica, ISSN-e 1666-9479, ISSN 1514-4186, Vol. 17, Nº. 1, 2003
• Idioma: inglés
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  • The purpose of this paper is to discuss the correlation potential of graptolite and conodont species important for marking the boundary between Lower and Middle Ordovician Series in Kazakhstan.

    The deep–water, hemipelagic and pelagic deposits of Arenig age representing slope and basin environments are widespread in Kazakhstan. Condensed and often continuous successions of sandstones, carbonates, siliceous shales and cherts yielding graptolites and conodonts are known in the Karatau Mountains, the northern part of Betpak–Dala (Figure 1, 1), the Sarysu–Teniz watershed (Figure 1, 6) and in the Chingiz Range (Figure 1, 8). Continuous, shallow–water successions composed of sandstones, mudstones and limestones yielding shelly fauna are known only in Maly Karatau (Figure 1, 9) and in north–western part of the Balkhash Lake area (Apollonov et al., 1990; Dubinina, 2000).