Here dinosaurs that should be long extinct live and roam, as do a curious race of humanoid savages that appear to exhibit all the various phases of Man's evolutionary development. To survive long enough to repair and replenish the U-boat, wartime enemies must put aside their differences and cooperate with one another. But not everyone is playing from the Kumbaya songbook...
http://www.eccentric-cinema.com/cult_movies/land_time_forgot.htm
I actually saw that idiot but entertaining move in the movie theater when it came out. Really so bad it is funny and entertaining.
Damn...that poster has it ALL...including the tittie shot
If I remember correctly, back in the 1950s there was a movie about finding dinosaurs at the bottom of the world.
https://en.wikipedia.org/wiki/The_Land_Unknown
The LAND UNKNOWN (1957).