Well, there are limestone deposits in the state, from what I've found. There is also dolomite, marble, granite, sandstone, and quartzite! We don't have a lot of that cool stuff up here
Anyway, for construction purposes, most subdivisions are built on clay, or silty clay type materials. The whole area is excavated and then refilled and packed down after pipes, manholes, etc are all connected underground. So they need material that is strong and easily moved and compacted. Depending on the type of clay and how much it expands when wet, sometimes limestone is added to make it stronger, because it actually changes the chemical properties of the clay.
So my guess is that is what most of your subdivision is built on. Of course, this is going off my knowledge of soil sciences way up here in Canada, so it might be a bit different down there!