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    {
     "label": "Tournaisian sandstone, mudstone, limestone",
     "url": "14170b8d600ae6898c9cb4b7792290bd",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAiUlEQVQ4jWNhoDJgGcEG5nQs0aXEoCkVMZfhBuZ0LNH9//9/Ky8vL9kG5rYvXj65MnY5CwMDAwPj//86ktJSDJJSUmQZ9vzZM4avnz8zwF1ITTBq4Igy8POnzwyfP90ky5DPnz8zMDIyXoEbOLkydnlOx5Ir5LqKkZERNesxMCDyIqVgCEUKtQAAdvAonKLlW6AAAAAASUVORK5CYII=",
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     "values": [
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    },
    {
     "label": "Tournaisian limestone",
     "url": "330d991af17806272fcbdc4204a5d64e",
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     "label": "Visean limestone & calcareous shale",
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     "label": "Visean sandstone, mudstone & evaporite",
     "url": "24221ba24edd7bf9e71bf080d57e26b4",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAhElEQVQ4jWNhoDJgGcEGbtgwU5cSgwIC0i/DDdywYaYuExNDKy87L9kGbto0e7mfX+pyFgYGBgYmJiYdSV4JBikeCbIMe/blBcPnn18Z4C6kJhg1cEQZ+OXXZ4Zb7z6TZcjnn58Z/v1juAI30M8vdfmGDTOvUOIylKyHLEApGEKRQi0AAJwvJTRCkNP5AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "Visean sandstone, mudstone & evaporite"
     ]
    },
    {
     "label": "Visean to Westphalian redbed sandstone, conglomerate & mudstone",
     "url": "c820333bd01667d5fd67b637a33a9e41",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAiElEQVQ4jWNhoDJgGcEGHiz00qXEIPv+bZfhBh4s9NJl+P+vlZeXl2wDDxd4LLedsGM5CwMDAwPT/386ElKSDFISkmQZ9uzFc4avnz8zwF1ITTBq4Igy8PPnLww3P98my5DPnz8zMDAyXYEbaDthx/KDhV5XyHYWIxNq1mNgQORFSsEQihRqAQBG2yegTWiVZwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "Visean to Westphalian redbed sandstone, conglomerate & mudstone"
     ]
    },
    {
     "label": "Namurian shale, sandstone, siltstone & coal",
     "url": "694b7a48c2b252f3a18271c5e3d7d9b3",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAf0lEQVQ4jWNhoDJgGcEGzpxprEuJQenpZy/DDYQYxtjKy8tDtoGzZ5ssT009s5yFgYGBgYmJUUdCQpJBQkKSLMNevHjO8PXrFwa4C6kJRg0cUQZ+/vyZ4fPnz2QZ8vnzFwYGhv9X4Aampp5ZPnOm8RVKXIaS9ZAFKAVDKFKoBQDkoSTm7ub22AAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "Namurian shale, sandstone, siltstone & coal"
     ]
    },
    {
     "label": "Westphalian shale, sandstone, siltstone & coal",
     "url": "e4c3e821629d78a309361bed1a7adc54",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAfElEQVQ4je3TMQrGIAyG4Q/M6AH0Du0RQxDpWTxQewcPEB2Ff5O/q7qU9h0zPARCCIujF4PMvM9AMcazg8y8G2MOa+0wGEJIIpIIAIhoc87Bez+E5ZxRa0XfcGUf+CpQVaGqQ0gpBa21q4Mikpj5mtns9nr/g9kedJRV/QBxTCbUpWWs1gAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "Westphalian shale, sandstone, siltstone & coal"
     ]
    },
    {
     "label": "Permian sandstone, conglomerate, evaporite",
     "url": "97c0d9a1983e708bd033a292a5131551",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAh0lEQVQ4jWNhoDJgGcEGHpzspUuJQfa52y7DDTw42UuXgflfKy8vL9kGHp7hsdw2Y8dyFgYGBgYm1n86EhKSDFKSkmQZ9uz5c4avXz8zwF1ITTBq4Igy8PPnLww3P98my5DPnz8zMPxlugI30DZjx/KDk72ukO8uJtSsx8CAyIuUgiEUKdQCADTVJn1DoOYCAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "Permian sandstone, conglomerate, evaporite"
     ]
    },
    {
     "label": "Triassic sandstone, mudstone, evaporite",
     "url": "20d89250d2ba02f316e9804f38293435",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAh0lEQVQ4jWNhoDJgGcEGHlyiq0uJQfYxly/DDTy4RFeXmeVfKy8vL9kGHlupvdwq/OpyFgYGBgZW1n86EhJSDBJSUmQZ9uLZM4avXz4zwF1ITTBq4Igy8POXzwyfb90ky5DPnz8z/P3DdAVuoFX41eUHl+heId9dTKhZj4EBkRcpBUMoUqgFAMfWJ4jAmeSiAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "Triassic sandstone, mudstone, evaporite"
     ]
    },
    {
     "label": "Jurassic mudstone & limestone",
     "url": "abc2cd97cfa74661df072b29e58cee48",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAc0lEQVQ4jWNhoDJgGckG2jHoUmTSIYbLCAPtGHQZmBhauXjJN++bE8Nyhn0MyyEGsjDoiEgwMAhLkmfY2+cMDN++MjAgXEhFMGrgiDLw22cIJgd8+8zAwPCP4QrCwH0My7/ZQQTIBihZD0mAUjCEIoVaAABitxkJ+yCaYAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "Jurassic mudstone & limestone"
     ]
    },
    {
     "label": "Cretaceous chalk, flint, glauconitic sandstone",
     "url": "60ccbcc9dab5575b974a21e1e77738e2",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAhUlEQVQ4jWNhoDJgGcEGamzo06XEoBsBRZfhBmps6NP9z/SvVUhEhGwDNTb1LL/hV7Ic4kKmfzpqaloMauoaZBl26+YNhvdv3jDAXUhNMGrgiDLwzbtXDG+OvyLLkHdv3jAw/mO6Ajfwhl/Jco0NfVfIdRUjAxNq1mNgQORFSsEQihRqAQDBvyetcv1RfgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "Cretaceous chalk, flint, glauconitic sandstone"
     ]
    },
    {
     "label": "Palaeocene basalt lava",
     "url": "e6beee2193e5c39df004cf5a9b6b40c6",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAg0lEQVQ4jWNhoDJgGcEGrqqdqUuJQWHN6ZfhBq6qnanLwMzQysvDS7aBaxpnLw+pT13OwsDAwMDEwqQjISHBICUpQZZhz56/YPj69SsD3IXUBKMGjigDP3/+zHDz82eyDPn85TMDw1+GK3ADQ+pTl6+qnXmFEpehZD1kAUrBEIoUagEApDAkcTNAiu0AAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "Palaeocene basalt lava"
     ]
    },
    {
     "label": "Oligocene clay, sand & lignite",
     "url": "a058becd7bb12ad46ef24f74ed82d9e5",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAh0lEQVQ4je3ToQ2AMBCF4VdSi8DWgQZHRyJMwhANA3QYzoHBIJEQcgMUVxJkqSHwyxNfLrmcROTkh0EiUz2B6rodPUhkKufQpWkWDA5Db7VurAQA55JSqRxKFUHYui5gPuA3jNkPfgpk3jDPWxDCvEMITB7UurFEZgrdSojb6wHX4GkvOkqsTh3MJuN/r4xqAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      "Oligocene clay, sand & lignite"
     ]
    }
   ]
  }
 ]
}