Basis for Range |
The earliest record is the basal stegosaur Huayangosaurus taibaii from China and the latest is Wuerhosaurus homheni from Valanginian-Aptian-age Tugulu Group in Xinjiang, China (Galton and Upchurch 2004). The fragmentary Dravidosaurus blanfordi from Coniacian-age beds in India is the only record of stegosaurs from the Late Cretaceous, but its identification as a stegosaur has been questioned (Chatterjee and Rudma 1996). Dates are rounded to the nearest million, the earliest at the boundary between the two cited stages and the latest from the midpoint of the stage range indicated (Gradstein et al. 2004).
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