Preliminary statement of problems of Pennsylvanian studied during 1929 in western Illinois
Weathering profiles below coals; weathering profiles along unconformities and below sandstones; Pennsylvanian channel sandstones, their extent and their conditions of deposition; persistence of coal horizons; correlation and persistence of marine members of cycles. Relation of 1929 field work to previous work in quadrangles studied; new interpretations. Composite section. See also Harold R. Wanless #8 and #13.
assisted by S.E. Ekblaw
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