{"thcode":1,"term":{"code":"art","name":"(aquifer rock types)","parent":"aroot","scope":"Generalized rock types of aquifers"},"uf":[],"bt":[{"code":"aroot","name":"US Aquifers","parent":"fUS","scope":"Aquifers of the 48 conterminous United States, Hawaii, Puerto Ri"},{"code":"fUS","name":"United States","parent":"fLD10","scope":"country"},{"code":"fLD10","name":"North America","parent":"fLD","scope":"continent"},{"code":"fLD","name":"Land","parent":"root","scope":"continent"},{"code":"root","name":"Earth","parent":null,"scope":"Common geographic areas focused on the US"}],"nt":[{"code":"ar400","name":"Carbonate-rock aquifers","parent":"art","scope":"aquifer rock type"},{"code":"ar600","name":"Igneous and metamorphic-rock aquifers","parent":"art","scope":"aquifer rock type"},{"code":"ar500","name":"Sandstone and carbonate-rock aquifers","parent":"art","scope":"aquifer rock type"},{"code":"ar300","name":"Sandstone aquifers","parent":"art","scope":"aquifer rock type"},{"code":"ar200","name":"Semiconsolidated sand aquifers","parent":"art","scope":"aquifer rock type"},{"code":"ar100","name":"Unconsolidated sand and gravel aquifers","parent":"art","scope":"aquifer rock type"}],"rt":[]}