Map 5: Structure Contours of the Top of the Pennsylvanian Springfield Coal and Bevier Coal (Missouri)
This map, the first structure-contour map, shows the variation in elevation of the top of the Springfield Coal, a Pennsylvanian stratigraphic marker horizon in the Illinois Basin.
[{'id': 15, 'name': 'Contour labels'}, {'id': 17, 'name': 'Contours'}, {'id': 18, 'name': 'Shaded relief'}, {'id': 19, 'name': 'Elevation'}]
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