In the late 80's, dinosaurs were becoming the in thing. It started with Universal's The Land Before Time movie series, followed by Dinosaucers, and finally, Denver, the Last Dinosaur, which turned out to be the most disappointing.
Denver was the first American-produced entry from Peter Keefe's World Events Productions, which previously had imported Voltron, Defender of the Universe and Saber Rider & the Star Sheriffs to the US. Contrary to what was fed to Wikipedia, the series lasted just 1 season. 10 weeks of weekday episodes that cycled through for 2 years running. 50 episodes in all were made, when 65 is usually the benchmark for a weekday series.
As Denver (Pat Fraley) learned about modern life, he in turn helped his human friends learn about his time. While kids were accustomed to "moral lessons" designed to teach at the end of daily cartoons, it seems that they tuned out Denver because it felt like an extra period of school. Just guessing, because I didn't watch the show. Hence, no rating.
Here's the 1 hour series opener: