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I remember reading a novel about the discovery of an ancient reptilian race discovered in a subterranean cave system. I thought it was written by Robert Silverberg but can't find it in his list of books. I think it was a YA novel. It was probably written in the 50s, 60s or early 70s.

closed as too broad by Adamant, QuestionAuthority, TheLethalCarrot, Valorum, Rand al'Thor Aug 10 at 10:21

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    I believe there are a few books with similar themes, can you remember anything else about this? What happens in it? How are they discovered? Etc. If you can remember anything else please edit in. – TheLethalCarrot Aug 10 at 8:22
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    Because these are based on old Hollow Earth theories, there are piles of them. E.g. any Doctor Who book about the Silurians. – Adamant Aug 10 at 8:51
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    Welcome to Science Fiction & Fantasy! This question matches multiple works and would be greatly improved by going through the checklists here; How to ask a good story-ID question? to identify any unique features that would distinguish it. – Valorum Aug 10 at 9:53