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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4jWNZy8AQKMbA4MBABfCKgeEAC8gwGwaGPGoYeISBgYGFgcqAZdRAigEL5UagglEDKQcsVDADBYwaOCLC8BUDwwFQSUsNADILAJiTCSv6aGErAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "7",
     "height": 20,
     "width": 20,
     "values": [
      "Pif"
     ]
    },
    {
     "label": "Pvn",
     "url": "7ab69f48fae460e7c48d9c610d6d0a26",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAT0lEQVQ4jWPJi3AN5OXkcGCgAvj8/ccBFpBhqnLiedQw8PajlwwsDFQGLKMGUgxYKDcCFYwaSDlgoYIZKGDUwBERhp+//zgAKmmpAUBmAQDGXRNj1vc51wAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "7",
     "height": 20,
     "width": 20,
     "values": [
      "Pvn"
     ]
    },
    {
     "label": "Pvu",
     "url": "b72b8d840d516826d73edfd4e3d144a7",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAT0lEQVQ4jWOZuNYnUFCEw4GBCuD9mx8HWECGGdlK5VHDwHOHnzGwMFAZsIwaSDFgodwIVDBqIOWAhQpmoIBRA0dEGL5/8+MAqKSlBgCZBQBCQROkuN9WUgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "7",
     "height": 20,
     "width": 20,
     "values": [
      "Pvu"
     ]
    },
    {
     "label": "PAgn",
     "url": "2421a5123a66371f5eca7c0c09fb35f2",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4jWNZW8IQKCLA4MBABfDmA8MBFpBhthoMedQw8PANBgYWBioDllEDKQYslBuBCkYNpBywUMEMFDBq4IgIwzcfGA6ASlpqAJBZACGzDmhfz8vsAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "8",
     "height": 20,
     "width": 20,
     "values": [
      "PAgn"
     ]
    },
    {
     "label": "Agr",
     "url": "2421a5123a66371f5eca7c0c09fb35f2",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4jWNZW8IQKCLA4MBABfDmA8MBFpBhthoMedQw8PANBgYWBioDllEDKQYslBuBCkYNpBywUMEMFDBq4IgIwzcfGA6ASlpqAJBZACGzDmhfz8vsAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "9",
     "height": 20,
     "width": 20,
     "values": [
      "Agr"
     ]
    },
    {
     "label": "Avo",
     "url": "0e093366340395e9bf346a832915a797",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4jWPRL9EP5ODhcGCgAvjx5ccBFpBh/Jr8edQwkOE6AwMLA5UBy6iBFAMWyo1ABaMGUg5YqGAGChg1cESE4Y8vPw6ASlpqAJBZAAWcD3uZpqazAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "9",
     "height": 20,
     "width": 20,
     "values": [
      "Avo"
     ]
    },
    {
     "label": "Agn",
     "url": "dd45ff20b512dd4121a392b7408c77e1",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4jWNZG8cQKMLD4MBABfDmC8MBFpBhtvIMedQw8PBDBgYWBioDllEDKQYslBuBCkYNpBywUMEMFDBq4IgIwzdfGA6ASlpqAJBZAH7XDl9pp1/8AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "9",
     "height": 20,
     "width": 20,
     "values": [
      "Agn"
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    },
    {
     "id": "1",
     "heading": "Ordovician"
    },
    {
     "id": "2",
     "heading": "Cambrian to Proterozoic"
    },
    {
     "id": "3",
     "heading": "Keweenawan Supergroup"
    },
    {
     "id": "4",
     "heading": "Wolf River Batholith"
    },
    {
     "id": "5",
     "heading": "Lower Proterozoic"
    },
    {
     "id": "6",
     "heading": "Lower Proterozoic Intrusives"
    },
    {
     "id": "7",
     "heading": "Lower Proterzoic Metamorphics"
    },
    {
     "id": "8",
     "heading": "Proterozoic to Archean Metamorphics"
    },
    {
     "id": "9",
     "heading": "Archean Rocks"
    }
   ]
  }
 ]
}