250 million!!!! That’s awesome. I believe very strongly in lost civilizations. One time in the past, when I was 16 years old I believed the ancient structures in our planet was built by aliens. Of course unhas found Daniken’s book at my grandma’s house lol. I was young. After continuing reading and studying I started to see that lost ancient civilization did live in our planet Earth, as I believe, before our time. I believe all the structures were built by those lost civilizations and I believe there were more ancient structures that with the time passing were destroyed by climate changes.
Graham Hancock liked to say 16.000 years ago and sometimes risk to say 200.000 years ago but I really believe 250 million it is totally possible.
I love this subject and I study a lot about it.
I believe in the question of the post they had trouble to find the other things they looked for because they quere destroyed by time.

Cintia Panizza
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"Happiness is only real when shared."
Christopher McCandless