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www.rockproducts.com Frac Sand Insider May 2015 | 57 Geology Figure 1. Map of shale plays and basins in North America. Figure 2. A magnifed sample of "Northern White" sand showing well-rounded grains. Figure 3. Geologic column showing the lithostratigraphic units in Sauk County, Wisconsin. Figure 4. Stratigraphic column of the Cambrian units of the Llano uplift of central Texas featuring the Upper Cambrian Hickory Sand- stone Member of the Riley Formation that unconformably overlies the Proterozoic basement. Figure 5. Stratigraphic column of the Ordovician Simpson Group showing subdivisions as in common usage in west Texas and Okla- homa. Figure 6. Areal extent (surface and subsurface) of the Ordovician St. Peter Sandstone in the upper and central Midwest and partly equivalent units within the Simpson Group in Kansas, Oklahoma, and west Texas. Figure 7. Surface exposures of frac sand source units in the up- per Midwest. Figure 8. Surface exposures of principal frac sand source units in Missouri, Arkansas, and Oklahoma. Figure 9. Outcrop of dune facies of St. Peter Sandstone at old mine entrances in Pacifc, Missouri. Figure 10. Surface exposures of "Brady" or "Brown" frac sand source units in central Texas and marginal frac sand outcrops in Oklahoma. Figure 11. Surface exposures of sand source units in the South- west that are used or are being considered for use as low-quality frac sand or for use in the manufacture of alternative proppants. Figure 12. Surface exposures of sand source units in the Great Plains states that are used in the manufacture of alternative prop- pants or are being considered for future use as frac sand. Figure 13. Surface exposures of quartzose sand source units in the Appalachian region that have limited potential suitability for use as frac sand. Figure 14. Index map of place names, provinces, and physio- graphic features mentioned in the description of mined and poten- tial sources for frac sand in Canada. Tables Table 1. Properties of St. Peter Sandstone in Missouri. Plate Plate 1. Producing and potential frac sand and resin-coated sand source units in the conterminous United States List of Figures