Caliche crusts are secondary products formed by the dissolution of meteoric water on former lithified sediments and rocks during their exposure into subaerial vadose environments. Because of continuous dissolution on former lithified sediments or rocks, these sediments or rocks will be broken into various sizes of clasts and pebbles. With uninterrupted dissolution by meteoric water, these waters will be saturated finally with great amounts of CaCO3. When these supersaturated waters flow down into the lower part of vadose zone just above phreatic zone, these calcium carbonates enclosed within the waters will be deposited as peculiar, laminated calcite cements which usually encrust around breccias or clasts of various sizes, thus forming typical laminated caliche deposits. Outer encrustations of these pisolites are also believed as the nature of laminated caliche deposits. These encrustations usually show some tendencies of thickening at the underside, thus indicating that these vadose waters which saturated with calcium carbonates have the features of hanging down towards the lower by the effects of the gravitation. These features are very similar to stalactites in the caves. Polygonal structures of the pisolites indicate also that these structures are formed by the effects of the gravitation.