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This study reports on the sedimentary characteristics of Lake Khuvsgul which is located at the southern end of the Baikal Rift System within the continental interior of East Eurasia. With an elevation of 1645 m a.s.l., it has a climate that is mainly controlled by the Siberian-Mongolian high pressure system and the westerly wind systems from the Atlantic Ocean. Lake Khuvsgul, Mongolia’s second largest lake by surface area (2760 km2), is the country’s deepest fresh water lake with a bottom that is only 262 m a.s.l. Fed by 96 rivers and streams, it is drained by the Eg River which, after joining the Selenge River, fl ows into Lake Baikal. Analysis of a 12.3 m core from Borsog Bay near the eastern shore of the lake indicates a sedimentation rate of about 0.08 cm/a. It is believed that this relatively high sedimentation rate is due to the large sedimentary input from River Borsog and the variability of the turbidity currents at depths shallower than 9 m. It further suggests that the large sedimentation rate may be correlated with the annual and seasonal variations in the dominant westerly wind system over the Siberian Plateau. Such variations have resulted in a lowering of lake level and impacted the rate of erosion within the river’s catchment area and therefore the sediment input to the lake. Because this is a preliminary report, further research into the sedimentary dynamics within Lake Khuvsgul and the role played in those dynamics by the climatic variability over Mongolia and Central Asia is planned.
Two fragments of upper jaws of the genus Entelodon, found in the Oligocene of Khoer-Dzan near Dzamyn-Ude, Eastern Gobi Desert, are described. They are attributed to the new species, Entelodon orientalis n.sp.
A new eutardigrade, Isohypsibius archangajensis sp. nov. is described from a moss sample collected in Mongolia. The new species is similar to I. barbarae Pilato et Binda, 2002 and I. undulatus Thulin, 1928 but it differs from them by the presence of shallow depressions forming the reticular design on the dorsal and lateral cuticle, lower number of dorsal undulations, larger body size, stylet supports inserted on the buccal tube in more caudal position, wider buccal tube and longer placoids.
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