Answer
The subsurface geologic situation responsible for the fountain of water is an artesian aquifer. An artesian aquifer is a confined aquifer, meaning it is bounded above and below by less permeable layers (aquitards) that trap the water and create pressure within the aquifer. In this case, the aquifer is likely composed of a permeable layer, such as a sandstone or limestone, that holds significant amounts of water, and it is confined between layers of less permeable rocks.
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