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     "values": [
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "groupId": "0",
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     "label": "Undifferenciated Cretaceous",
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     "groupId": "0",
     "height": 20,
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     "values": [
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     "groupId": "0",
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     "values": [
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    },
    {
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     "values": [
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     "label": "Upper Cretaceous",
     "url": "c0c3af7a45d3c71dcd593367bb6bf5e7",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4jWPpb4h04mX9qsBABfD5N/cDFpBhyXqb5Khh4NxLfgwsDFQGLKMGUgxYKDcCFYwaSDlgoYIZKGDUwBERhp9/cz8AlbTUACCzAIKdEa9t9HIfAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Upper Jurassic",
     "url": "2e7c327cc13aebbe53b1fd17a5251e03",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4jWNJaYh0+s/0VYGBCoDxH/cDFpBh9zU3yVHDQMXrfgwsDFQGLKMGUgxYKDcCFYwaSDlgoYIZKGDUwBERhoz/uB+ASlpqAJBZAAG9EB403Hh4AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Upper Paleozoic",
     "url": "4e99a46c9016f24296b167bbd13a3e36",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4jWPpz4l04mX8qsBABfD5P/cDFpBhyV83yVHDwLncfgwsDFQGLKMGUgxYKDcCFYwaSDlgoYIZKGDUwBERhp//cz8AlbTUACCzAOn1ENhM50G4AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "STRATI_EN"
    }
   ]
  }
 ]
}