I think the limestone product you mite want is called 1/4 down. It packs nicely and could be used just itself for roadbed . Or I should say that what it is here in TN
. It is a limestone product that is screened from the other sizes. The dirt that is there at Nates would work since it has so much sand inn it if you are wanting to put concrete down. Another product that would work is paver base from Lowes or Home depot, noy paver sand.