The Patterson-Gimlin film
Bob Gimlin and Roger Patterson say they filmed a Bigfoot near Bluff Creek on 20 October 1967, in a clip of 59.5 seconds.
The film has 954 frames. At 16 frames per second it plays for 59.5 seconds. Wikipedia notes that Grover Krantz believed it was shot at 18 frames per second, which would make the event last 53 seconds. Discovery UK says Patterson and Gimlin shot it on 20 October 1967, and Wikipedia gives the same date as the filmmakers' account. Some critics believe it was shot earlier.
Outside Magazine places the two men on horseback near Bluff Creek on a late October afternoon, with Patterson riding in front and filming with a rented 16mm movie camera. Wikipedia adds that the film was published in 1967 without a copyright notice and which makes it public domain property in the United States.
"The film is 23.85 feet (7.27 m) long (preceded by 76.15 feet or 23.21 meters of "horseback" footage), has 954 frames,[10] and runs for 59.5 seconds at 16 frames per second. If the film was shot at 18 fps, as Grover Krantz believed,[11] the event lasted 53 seconds. The date was October 20, 1967, according to the filmmakers, although some critics believe it was shot earlier.[12][13][14][15] As a film published in 1967 without a copyright notice, it is in the public domain in the United States."
- The Patterson-Gimlin Film: Evidence of Bigfoot or Elaborate Hoax?, Discovery UK
- The Man Who Created Bigfoot, Outside Magazine