They were excavated from Leibei, the first Eocene fossil site recognized on the southern bank of Hanjiang River in Liguanqiao Basin, Hubei Province of China (Huang et al., 1996).

• 该化石点是李官桥盆地中汉江南岸早始新世化石地点的首次发现，它的认定对在此地区寻找古新统/始新统界线有重要意义。