Manuscript entitled, Fossil Flora and Fauna of the Pennsylvanian Period, Will County, Illinois
by George Langford (1876-1964)
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The complete series of fossil-bearing deposits in chronological order, the earliest at the bottom of the chart, pp 2-3.
GL's sketch: Complete series of fossil-bearing deposits, oldest at the bottom.
Description of the chart at left in George Langford's handwriting.
Complete series of fossil-bearing deposits, page 2
Notes on fossil-bearing deposits in GL's handwriting, page 3