Carbonate rich, sandy soils at the surface with completely solid bedrock at depth. The semi-arid environment would have soils with high pH (alkaline), low organic matter accumulation, and high salt concentrations.

Carbonate poor, sandy soils at the surface with cave systems deep into the bedrock. The semi-arid environment would have soils with high pH (alkaline), low organic matter accumulation, and high salt concentrations.

Carbonate rich, sandy soils at the surface with cave systems deep into the bedrock. The semi-arid environment would have soils with high pH (alkaline), low organic matter accumulation, and high salt concentrations.

Carbonate poor, sandy soils at the surface with solid bedrock at depth. The semi-arid environment would have soils with high pH (alkaline), low organic matter accumulation, and high salt concentrations.

Carbonate rich, sandy soils at the surface with cave systems deep into the bedrock. The semi-arid environment would have soils with low pH (acidic), high organic matter accumulation, and low salt concentrations.