One Million Years B.C. is a 1966 (released in 1967) adventure film/fantasy film starring Raquel Welch set - loosely - in the time of cavemen.
The film was made by UK's Hammer Film Productions, and was a remake of the 1940 Hollywood film One Million B.C..
It is marketed with the tagline "Travel back through time and space to the edge of man's beginnings...discover a savage world whose only law was lust!"
Like the original film, this remake is largely ahistorical.
It portrays dinosaurs and humans living together, whereas the last dinosaurs became extinct roughly 65 million years BC, and homo sapiens (modern humans) did not exist until about 200,000 years BC.
Harryhausen has stated in a commentary of the unfinished film, Creation, shown on the King Kong 1933 DVD, that he did not make One Million Years B.C. for "professors" who in his opinion "probably don't go to the cinema anyway."