TY - RPRT TI - Origin of a classic cratonic sheet sandstone: Stratigraphy across the Sauk II-Sauk III boundary in the Upper Mississippi Valley AU - Anthony C. Runkel AU - R.M. McKay AU - A. R. Palmer PY - 1998 DO - 10.1130/0016-7606(1998)110<0188:ooaccs>2.3.co;2 UR - https://pubs.usgs.gov/publication/70020653 ID - 70020653 ER -