Description: <DIV STYLE="text-align:Left;"><P STYLE="font-size:16ptmargin:7 0 7 0;"><SPAN>A map by Peterson (1988) was used for structure for the Madison Group.</SPAN></P><DIV><DIV><P><SPAN /></P></DIV></DIV></DIV>
Copyright Text: Peterson, J. A., Longman, M. W., Anderson, S. B., Pilatzke, R. H., and Kent, D. M., 1987, Williston Basin, anatomy of a cratonic oil province: Rocky Mountain Association of Geologists, 440 p.