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     "url": "db1fa263bc27ca6de399f6227a9ad291",
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    },
    {
     "label": "Precambrian - Sioux Quartzite Fm. (Xs)",
     "url": "85c806af3b469d16e3ec7bcbe540d078",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAANklEQVQ4je3MMREAMAwDsc+dqYQ/oIJp58z21giAdOAS0lAiTBva5BfThj4FjmFDnz4MGyo5PrR0Ane/9bBPAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
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    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
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}