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     ]
    },
    {
     "label": "U Unmapped Area",
     "url": "d6fb98e0d47c81bb190268625f688c74",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAN0lEQVQ4je3QoREAMBACQTJD/y0Tk4jX4J4zuBUQgBCMb0/I0wdjsaAdfWJW0I8BY1Rw04dKiRdWjgNPSyeLfgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "pC Precambrian undifferentiated",
     "url": "6b75531893fef230bad932d572cb8726",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAOklEQVQ4jWN5dmr6fwYqASmzTEYWBioDllEDKQYslBuBCkYNpBywUMEMFDBqIOWAZQQaKGWWyUhNEwFZfwUL0IQ0MwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "pC"
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  }
 ]
}