This series about the lives of the Day family living at the turn of the last century in a small rural town could be considered a mashup of The Waltons and The Flintstones. The animated series had a more somber tone than the usual animated fare, with thought given to realistic circumstances and interpersonal interactions. It was produced by Hanna-Barbera and was one of the few dramatic series the studio tackled.
Above is the opening sequence of the show, which only aired for one season - 1974 - '75 before being canceled after only 16 episodes. The sequence was uploaded to YouTube by muttley16.
Obscurity factor: 9 (fondly remembered by some fans, hard to find, not available on DVD)