Glacial boundary lines representing the extent of glaciation for major glacial episodes in Illinois. Data originally from Quaternary Deposits in Illinois map by Lineback (1979) and modified according to the reclassification by Hansel and Johnson, ISGS Bulletin 104 (1996). Attribute items include glacial episode identifier. ISGS, 1984 (revised 1998).
This feature dataset shows continuous lines representing the lowermost elevations/locations of (buried) bedrock valleys in the state of Illinois. Additionally, names of buried valleys are annotated. Scale is 1:500,000.
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{'Title': 'Glacial Boundaries of Illinois', 'Author': 'Illinois State Geological Survey', 'Comments': 'Glacial boundary lines representing the extent of glaciation for major glacial episodes in Illinois. Data originally from Quaternary Deposits in Illinois map by Lineback (1979) and modified according to the reclassification by Hansel and Johnson, ISGS Bulletin 104 (1996). Attribute items include glacial episode identifier. ISGS, 1984 (revised 1998).', 'Subject': 'Glacial Boundaries of Illinois', 'Category': '', 'AntialiasingMode': 'None', 'TextAntialiasingMode': 'Force', 'Keywords': 'geology,glacial,Illinois'}
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nan