The company resurveyed and restudied the proposed route with an eye toward cuttong costs. American paleontologist Charles W. Gilmore restudied the holotype and described new features in 1922. The children were restudied ten years later. She restudied these communities in the 2000s. However, passage two was tested on instead of being restudied. These scaled-up versions were corrected (if needed), and restudied in place in the tympanum. This project restudied the older excavations and also conducted limited new excavations.