Caliche is extremely hard and prevalent in Arizona's deserts (lived with it 40+ years, here and there). I've seen a fair number of exhibitors at art and craft shows, for example, use everything from water bottles to buckets to small drums filled with concrete with a hook or eyelet in it. Tie things down to that, usually one at each corner. But I wouldn't bet the farm that a good desert wind or a dust devil couldn't rip it up. The desert does get very windy. Sorta nice on a hot day, though, if you're not getting sandblasted into the bargain! Anyway, per Wikipedia:
>>>>>"Caliche is a hardened deposit of calcium carbonate. This calcium carbonate cements together other materials, including gravel, sand, clay, and silt. It is found in aridisol and mollisol soil orders. Caliche occurs worldwide, generally in arid or semi-arid regions, including in central and western Australia, in the Kalahari Desert, and in the High Plains of the western USA. Caliche is also known as hardpan, calcrete, kankar (in India), or duricrust. The term caliche is Spanish and is originally from the Latin calx, meaning lime.
"Caliche is generally light colored but can range from white to light pink to reddish-brown, depending on the impurities present. It is generally found on or near the surface, but it can be found in deeper subsoil deposits as well. The layers can vary from a few inches to feet thick, and multiple layers can exist in a single location." <<<<<
