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Sorry, realised just after sending the email -
the supposed "gap" is from:
the last _Coelophysis_ and _Dilophosaurus_ about 197 mya,
mid
Pliensbachian, early Jurassic,
to
_Gasosaurus_, closely followed by _Proceratosaurus_ and
the first
_Megalosaurus_ about 173 mya, Bathonian, mid
Jurassic.
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