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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEVJREFUOI1jYaAyYKGZgcbGxjMpNezs2bPpKC483d1NtmGmpaUMDAy09PKogaMGjho4aiBOA2FFEDng7Nmz6SgGwgQoBQAJiQ4MwayGfwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Upper Paleozoic siliciclastic rocks - Sandstone, quartzite, and silstone in the lower two-thirds, and interbedded limestone, dolomite, and sandstone in the upper third",
     "url": "8e7afd607fb58a271fddcffceca9417d",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEVJREFUOI1jYaAyYKGZgcbGxjMpNezs2bPpKC48W7aZbMOMu3wZGBho6eVRA0cNHDVw1ECcBsKKIHLA2bNn01EMhAlQCgACdw33Hzb3igAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "UPzs"
     ]
    },
    {
     "label": "Upper Paleozoic carbonate rocks - Limestone, dolomite, and fine-grained sandstone",
     "url": "455739b4f432faba0d939ea0c5a7f65c",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEVJREFUOI1jYaAyYKGZgcbGxjMpNezs2bPpKC6s7VpHtmHNZUEMDAy09PKogaMGjho4aiBOA2FFEDng7Nmz6SgGwgQoBQAZGg44dHlQswAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "UPzc"
     ]
    },
    {
     "label": "Middle Paleozoic siliciclastic rocks - Shale, mudstone, and thin beds of quartzite and limestone",
     "url": "934462a729ad05f9d8762edffc438b21",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEVJREFUOI1jYaAyYKGZgcbGxjMpNezs2bPpKC4smrSObMP68oIYGBho6eVRA0cNHDVw1ECcBsKKIHLA2bNn01EMhAlQCgAaLQ47skka3QAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "MPzs"
     ]
    },
    {
     "label": "Middle Paleozoic carbonate rocks - Limestone and sandstone",
     "url": "5a2e9c6d2f05f9fbd9c51d8f6c485b2b",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEVJREFUOI1jYaAyYKGZgcbGxjMpNezs2bPpKC7sWr2bbMPKQl0ZGBho6eVRA0cNHDVw1ECcBsKKIHLA2bNn01EMhAlQCgAE0g39sr24LQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "MPzc"
     ]
    },
    {
     "label": "Lower Paleozoic carbonate rocks - Limestone, dolomite, and minor sandstone",
     "url": "5c41b43e82bbb1ff3cd17bd2a4db0e64",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEZJREFUOI1jYaAyYKGZgcbGxjMpNezs2bPpKC5cM3MD2YaFpAcwMDDQ0sujBo4aOGrgqIE4DYQVQeSAs2fPpqMYCBOgFAAAAu0N+MHRHdUAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "LPzc2"
     ]
    },
    {
     "label": "Lower Paleozoic siliclastic rocks - Quartzite and sandstone",
     "url": "ab8de29c57ce28b9ed9a8592d8a45602",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEVJREFUOI1jYaAyYKGZgcbGxjMpNezs2bPpKC6cHlNItmGZS/oZGBho6eVRA0cNHDVw1ECcBsKKIHLA2bNn01EMhAlQCgA0mw6JMc1P9AAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "LPzs"
     ]
    },
    {
     "label": "Lower Paleozoic carbonate rocks - Limestone, silty limestone, dolomite, and shale",
     "url": "d0469f25eca5ec19b76fe8f15441a8b2",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEZJREFUOI1jYaAyYKGZgcbGxjMpNezs2bPpKC6c4eFDtmEZO7YwMDDQ0sujBo4aOGrgqIE4DYQVQeSAs2fPpqMYCBOgFAAAR7UOwQqEMmsAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "LPzc1"
     ]
    },
    {
     "label": "Cambrian-Neoproterozoic siliciclastic rocks - Shale and thinly bedded limestone in the upper one-fourth, and quartzite and shale in the lower three-fourths",
     "url": "0bedb7295850a69fb9aa32a6eba473a2",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEVJREFUOI1jYaAyYKGZgcbGxjMpNezs2bPpKC4sTIwj27D++YsYGBho6eVRA0cNHDVw1ECcBsKKIHLA2bNn01EMhAlQCgBGjg69s+UkHgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "CZs"
     ]
    }
   ]
  }
 ]
}