From 2003 to 2004, we collected a large amount of Nautiloid and Graptolite fossils in upper metamorphic formations of Mayigangri area and determined the age to be middle and Late Ordovician-Silurian.

• 2004年我们在玛依岗日一带变质岩系上部采获大量鹦鹉螺类和笔石类化石；经研究确定时代属中、晚奥陶世-志留纪.