The Valley of Gwangi is a 1969 American westernfantasy film directed by Jim OConnolly and written by William Bast. It stars James Franciscus and, in their final film appearances, Richard Carlson and Gila Golan. It was filmed in Technicolor with creature effects provided by Ray Harryhausen, the last dinosaurthemed film to be animated by him. Harryhausen had inherited the project from his mentor Willis OBrien, the special effects master behind the original King Kong, who had planned to make The Valley of Gwangi decades earlier but died six years before the film was realized.
T.J. has an ace she hopes will boost attendance at her show a tiny horse, El Diablo. Tuck meets a British paleontologist named Horace Bromley, who is working in a nearby Mexican desert. Bromley shows Tuck fossilized horse tracks, and Tuck notes their similarity to El Diablos feet. Tuck sneaks Bromley into the circus for a look at El Diablo, and Bromley declares the horse to be an Eohippus.The tiny horse came from a place known as the Forbidden Valley. A Gypsy known as Tia Zorina claims that the horse is cursed, and demands that it must be returned. Later, she and other gypsies collaborate with Bromley to steal El Diablo and release him in the valley. Bromley hopes to follow the horse to its home in search of other prehistoric specimens. Carlos, an exmember of the Gypsy tribe now working for T.J.s circus, walks in on the theft and tries to stop it, but is knocked out. ........
Source: Wikipedia