What's the Name of That Book??? discussion

This topic is about
Adventure of the Stone Man
SOLVED: Children's/YA
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SOLVED. Children's or YA/young adult, set in France, young girl finds a stone figure that turns out to be an important archaeological find. [s]
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David, is this a fiction or non-fiction book? If there are illustrations, can you describe them?

A long, long shot - Adventure of the Stone Man by Frances Hamerstrom?
www.worldcat.org - "Two French children [brother and sister] try to keep the secret of their cave from the outside world and from a scientist searching for a rare eagle owl."
Here's one cover image - https://i.ebayimg.com/images/g/Tp4AAO...
www.worldcat.org - "Two French children [brother and sister] try to keep the secret of their cave from the outside world and from a scientist searching for a rare eagle owl."
Here's one cover image - https://i.ebayimg.com/images/g/Tp4AAO...
The story was about a young girl in France who finds a small stone figure in a cave (I think). I believe she put it in the pocket of her pinafore, which leads to her mother discovering it while washing the pinafore.
Someone recognizes the figure as unusual and it turns out to be an important archaeological find.
That's as much as I can remember right now.