Help me find a movie! - 60's soviet film about prehistoric island

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"Conscience is a nuisance. A fly. A barking dog."
Hello everyone!

I've been looking for a film but I'm just not able to find it.
It's a color soviet(i think) movie from the early 60's, late 50's that is set in a prehistoric island. I don't remember much of this film but I think it's some sort of cult classic. All I remember is that is set in a prehistoric island with dinossaurs or at least lizards, it seemed to me like a kind of a soviet Lost World or a soviet Journey to the Center of the Earth. If anybody could help I would be very grateful. Thanks in advance!



"Conscience is a nuisance. A fly. A barking dog."
That's exactly it! Journey to the Beginning of Time! I thought it was soviet but it's really Czech. A thousand thank yous, I will watch it right away