The fossil was found in 2010 in the Grès supérieurs Formation of the Savannakhet Basin in Savannakhet Province, in a layer which is likely Aptian in age.
Five are known from the Early Cretaceous; Pterolytoceras and Metalytoceras from the Valangian (Petrolytoceras may extend back to the Tithonian), Eulytoceras from the Hauterivian - Barremian, Argonauticeras and Pictetia from the Aptian - Albian.
Sir A. Geikie (Text Book of Geology, 4th ed., 1903) regards Neocomian as synonymous with Lower Cretaceous, and he, like Renevier, closes this portion of the system at the top of the Lower Greensand (Aptian).
Its remains have been found in the Aptian-Albian age Lower Cretaceous Arundel Formation of Muirkirk, Prince George's County, Maryland.
The Jiufotang overlays the Yixian, which suggests an Aptian or Albian age (between 100-120 million years old), according to Swisher et al. (1999).