Indeed, the fact that many of these tools are unknown to us, suggests a culture which, in certain ways, equals our own.
11 seconds sound clip from the Planet of the Apes (1968) movie soundboard.
You can hear this line at 01:35:39 in the Blu-ray version of the movie.
Quote context
[...]
- But the artifacts lying here were found at this level and date back, uh, 700 years earlier.
- That's the paradox. For the more ancient culture is the more advanced.
- Now, admittedly, many of these objects are unidentified.
- But clearly, they were fashioned by beings with a knowledge of metallurgy.
- Some of the evidence is uncontestable.
- Don't speak to me in absolutes. The evidence is contestable.
- To begin with your methods of dating the past are crude, to say the least.
[...]