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> Clearly little known is that a Kimmeridge Clay (Kimmeridgian, Upper
> Jurassic) ornithomimosaur was reported by Clarke and Brokenshire a
> few years ago. The material (from Dorset) is unimpressive: two
> manual phalanges, one of which is an ungual. Identification is suspect -
> - nevertheless (err, excepting _Shuvosaurus_) it is the oldest reported
> ornithomimosaur.

I didn't know that one, but doesn't
    James O. Farlow & Michael K. Brett-Surman: The Complete Dinosaur,
    University 1997
mention ornithomimosaurian teeth [sic] from the Late Jurassic of Utah?
Considering troodontids and tyrannosauroids being around in the Middle
Jurassic, the surprise isn't that big.
        Sad to say, but Shuvosaurus really is the senior synonym for
Chatterjeea and thus an odd ?rauisuchian. No Triassic ornithomimosaur.