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近两年对准噶尔盆地北缘第三纪地层进行了进一步调查和研究，在索索泉组和哈拉玛盖组内发现了新的化石层位。对新发现的哺乳动物的研究表明在勒布勒津地区索索泉组顶部的沉积物时代为中中新世，下部的沉积物时代不晚于晚渐新世，中新世与渐新世地层的界线应在索索泉组内寻找。新发现的动物群分子Cricetodonsp．nov．和Tachyoryctoidessp．nov.指示哈拉玛盖动物群的时代应重新考虑，有可能早于丁家二沟动物群。
In the recent two years, the Tertiary stratigraphy in the northern margin of Junggar Basin has been further investigated and studied, and new fossil beds have been found in the Soxoquan and Halamagi formations. Studies of newly discovered mammals indicate that the sediment age at the top of the Soxoquan Formation in the Leybold region is Miocene, the lower sediment age no later than late Oligocene, Miocene and Oligocene The boundary of the Sorso Springs Group should be searched. Newly discovered fauna molecule Cricetodonsp. nov And Tachyoryctoidessp. nov. Indicates that the age of the Halamayi fauna should be reconsidered, possibly as early as the Dingjia Ergou fauna.