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     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Middle Devonian",
     "url": "8f4c1137af524a9bb86b9433afb59f84",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWP5dKb4PwOVAJ9JLyMLtQyDgVEDRw0cNXDUwFEDaWUgn0kvIzUNBABZkQUhwq2RgwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Lower Devonian",
     "url": "95f6ac11e6243cec2177360c568f04ef",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWN5tjnyPwOVgJTvckYWahkGA6MGjho4auCogaMG0spAKd/ljNQ0EABaQAVgLIpmaAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Silurian",
     "url": "1a91df85900dc31a0fedb568dfaedb13",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWPZ/H//fwYqAV9GR0YWahkGA6MGjho4auCogaMG0spAX0ZHRmoaCABZXATh11EipQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Ordovician",
     "url": "91585a1c7df709f87dc5976e4be741ba",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALElEQVQ4jWNh+J/2n4FagHEWIwvVDIOCUQNHDRw1cNTAUQNpZiDjLEZqGggABYAD7aBHgEwAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Cambrian",
     "url": "875fcc0db9477cb99cd86367e2134da1",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWNpOBP5n4FKoMFkOSMLtQyDgVEDRw0cNXDUwFEDaWVgg8lyRmoaCABbjQWth5KlWgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Precambrian",
     "url": "1da3acef819ffc348976ce750f96f7db",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWP577D5PwOVAOMBX0YWahkGA6MGjho4auCogaMG0spAxgO+jNQ0EABagQVg/A1RngAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "older named age"
    },
    {
     "id": "1",
     "heading": ""
    }
   ]
  }
 ]
}