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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
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Alessandro Marisa
Via Achille Grandi n°18
Rovereto (TN) ITALY
Tel: 039-0464-434658 Email: amaris@tin.it
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