It won't lower the PH; instead it should raise it. Not sure of the effects of so much concentrated in one place; but I think a little of it is actually beneficial. I'll be interested to hear what you find out about this - I'd like to know too!

Sorry Karen I misspoke, meant raise the PH. I ended up burying it under about a foot of good soil brought in from another spot but it still concerns me. I just have no experience on how fast lime leaches from the rock if much at all....

The best way to tell is have a soil test done at your local Extension agency .
Dig down 6 inches in four or five different places .
Place a few trowel fulls of the soil in a bucket .
Mix and remove around 2 cups or less .
Place in a container and label it as to what you want it to grow , like veggies , turf , flowers , etc .
Drop off at the Extensions Service .
They will send you results of pH and salt solubility .
This way you will know what plants to place in that area.
This link is easy to print and keep for future reference .

Here is a link that might be useful: Florida Friendly Plant List

bamboo rabbit, I have a lot of natural limerock in my soil. I never saw rocks in Florida ground until I moved here! My pH hovers around neutral, making azaleas very unhappy if not dead and some roses have moved on to more acidic gardens. If it were me (which it was a few years ago), I would dig it out, especially if it's a concentrated pile of it. Or if it's huge area hire someone to take it out with some equipment. I think it will only make trouble for your gardening even with 12" of soil on top of it. I've learned that permanently lowering high pH with soil sulfur or other amendments is pretty much impossible. It can be kept at neutral with lots of compost and mulch though, but stop composting and it will revert to high pH.

Sherry

You can do raised beds if your concerned about your acid
loving plants. I believe this is commonly done when people
want to grow plants that prefer acidic soil and their soil
is closer to neutral/basic. The lime will not leach 'up'.
Build raised bed would WAY cheaper and easier then trying
to remove all the lime stone from your soil.

Not acid loving plants this spot where the pile of limerock gravel was dumped is at the end of the older veggies garden and the idea was to enlarge that garden. I did screen out a couple hundred pounds of the stone (what a miserable job) and covered the rest. It is now planted and we shall see how it does. If there is a problem I will go from there. Thanks all for the advice.

If your growing veggies there the lime soil won't be
a problem at all. Most veggies like soil closer to neutral Ph.
If dug deep enough almost the entire state is limestone anyway.