Description: <DIV STYLE="text-align:Left;"><P STYLE="font-size:16ptmargin:7 0 7 0;"><SPAN><SPAN>The St. Peter Sandstone is a mature quartz arenite that contains little or no silt and clay, except near its perimeter. Lamar (1928; his fig. 10) provided results of grain-size analysis for a number of St. Peter Sandstone samples in which the percent clay ranged from 0 to 5.8, with a mean of about 2.5 percent. Because clay and silt are minor constituents of the St. Peter Sandstone, we calculate net sand thickness.</SPAN></SPAN></P><DIV><P><SPAN /></P></DIV></DIV>
Service Item Id: fab40b36bb3444cbb454882466098366
Copyright Text: Lamar, J. E., 1928, Geology and economic resources of the St. Peter Sandstone of Illinois: Illinois Geological Survey Bulletin No. 53, 175 p.