“…It has limited geochronologic studies from volcanic rocks yield ages around 173 Ma in Beipiao area (Chang, Zhang, Hemming, Mesko, & Fang, ; Wu, Li, & Wang, ; Li, ). Based on the discoveries of floral fossils, bivalves, clam shrimps, insects, and plants (Chang et al, ; Huang, ; Jiang, ; Kirchner & Van Konijnenburg‐Van Cittert, ; Liao, Shen, & Huang, ; Wang, ; Wang et al, ; Wang & Wang, ; Wang, Zhou, Liu, Li, & Yang, ; Zhang, Li, & Huang, ) which belong to the Yanliao Biota, researchers suggested that the Haifanggou Formation is Middle Jurassic in age (Chang, Zhang, Renne, & Fang, ; Chang et al, ; Wang et al, ).…”