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Top Seal Thickness contours for St. Peter Sandstone, Illinois.<\/SPAN><\/P><\/DIV><\/DIV>", "summary": "Top Seal Thickness for St. Peter Sandstone", "title": "St. Peter Top Seal Thickness", "tags": [ "St. Peter Sandstone", "Illinois Basin", "Kentucky", "Indiana" ], "type": "", "typeKeywords": [], "thumbnail": "", "url": "", "minScale": "NaN", "maxScale": "NaN", "spatialReference": "", "accessInformation": "unknown", "licenseInfo": "See access and use constraints information.", "portalUrl": "" }