According to TV Shows on DVD, the 1974 Hanna-Barbara animated Saturday morning series, Valley of the Dinosaurs, will be released this week by Warner Archives as a 2-disc, MOD set containing all 16 episodes.
The science fiction/adventure cartoon, which aired on CBS from September 7, 1974 to September 4, 1976, chronicled the adventures of the Butler family - father John, his wife Kim, children Katie & Greg, and dog, Digger - who (like the Marshalls on Land of the Lost, which began the same year on rival network NBC) experienced an unusual whitewater rafting trip that left them trapped in a lost world populated by prehistoric reptiles and proto-humans. They befriended the English-speaking caveman Gorak and his family, and together they struggled to survive in the dangerous valley while continually searching for a way back to their own world.
The show was popular enough to spawn some limited merchandise and a short-lived Charlton comic book series, but even as a sci-fi/dinosaur-loving kid, I found it pretty mundane compared to the wildly imaginative universe of its live-action, Sid & Marty Krofft rival, Land Of The Lost.
Here's a link to Warner Archive's Hanna-Barbara "Store;" Valley of the Dinosaurs isn't listed yet, but there's a lot of other 70s Saturday morning favorites there.