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Pure silica glass melts at a temperature of some 1600 deg C or 2900 deg. F. Assuming the marbles were not pure silica but rather had some admixtures (flux) the softening point would still be beyond 2000 deg. F. Before this temperature was reached the entire house would long have spontaeously combusted.

My guess is the "glass" marbles were in fact a form of hard plastic and this plastic softened and deformed in the 125-150 deg F range.
 
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