This map is a digital elevation model of the bedrock surface at 3× vertical exaggeration. In regions that have a cover of Pleistocene glacial drift, the map uses the surface of the unconformity between the drift and the bedrock surface. In places outside the cover of Pleistocene glacial drift, it corresponds to a subdued version of the ground surface or to the ground surface itself. The map emphasizes the effect of the Pleistocene glaciations (see Map 3), which completely altered the drainage patterns in Illinois and Indiana. The apparently smoother surface in Missouri is an artifact of the lower data density in the map coverage from Missouri. The bedrock surface in Missouri is actually just as rugged as that in the other three states.
This map is a digital elevation model of the bedrock surface at 3× vertical exaggeration. In regions that have a cover of Pleistocene glacial drift, the map uses the surface of the unconformity between the drift and the bedrock surface. In places outside the cover of Pleistocene glacial drift, it corresponds to a subdued version of the ground surface or to the ground surface itself. The map emphasizes the effect of the Pleistocene glaciations (see Map 3), which completely altered the drainage patterns in Illinois and Indiana. The apparently smoother surface in Missouri is an artifact of the lower data density in the map coverage from Missouri. The bedrock surface in Missouri is actually just as rugged as that in the other three states.
[]
{'Title': 'Bedrock Topography', 'Author': 'Digitally compiled by Curtis C. Abert, Stephen Marshak, and Timothy H. Larson', 'Comments': 'This map is a digital elevation model of the bedrock surface at 3× vertical exaggeration. In regions that have a cover of Pleistocene glacial drift, the map uses the surface of the unconformity between the drift and the bedrock surface. In places outside the cover of Pleistocene glacial drift, it corresponds to a subdued version of the ground surface or to the ground surface itself. The map emphasizes the effect of the Pleistocene glaciations (see Map 3), which completely altered the drainage patterns in Illinois and Indiana. The apparently smoother surface in Missouri is an artifact of the lower data density in the map coverage from Missouri. The bedrock surface in Missouri is actually just as rugged as that in the other three states.', 'Subject': 'Bedrock Topography', 'Category': '', 'AntialiasingMode': 'None', 'TextAntialiasingMode': 'Force', 'Keywords': 'geology,topography,bedrock,contours,shaded relief,elevation,Missouri,Illinois,Indiana,Kentucky'}
nan
nan