The Ordovician graptolite bearing beds have been found from the core of Tadong 2 borehole in the northeastern Tarim Basin, Xinjiang.

• 塔里木盆地东部塔东2井岩心中新发现了一些奥陶系笔石化石,这些笔石标本呈炭质薄膜状,保存在该井4550。