The remains of the type specimen of Dilophosaurus wetherilli UCMP 37302 and partial skeleton UCMP 37303 were recovered in the Silty Facies Member of the Kayenta Formation, in northeastern Arizona.
Explorations in the 1970s and 1980s by James M. Clark, Farish Jenkins and David E. Fastovsky and collection and analysis by William R. Downs have produced several vertebrate specimens.