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Age of Archaeoceratops

Dear ListMembers, I'm very grateful if someone could tell me the exact age of Archaeoceratops oshimai, in my data-file I've:
Archaeoceratops Dong, Azuma, 1997
A. oshimai Dong, Azuma, 1997
Occurrence: Xinminbao Group, Gongpoquan Basin of the Mazongshan Area, Gansu Province, China.
Period and age: early Cretaceous
But the early Cretaceous period include Barresian Valanginian, Hauterivian, Barremian (forming Neocomian), Aptian, and Albian, to which age corrispond the Xinminbao Group?
By and thank's
Alessandro Marisa
Via Achille Grandi n°18
Rovereto (TN) ITALY
Tel: 039-0464-434658 Email: amaris@tin.it