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|tree2=Jordan Sandstone ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.

...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...e (Jordan). The series, in turn, is overlain unconformably by Champlainian sandstone (St. Peter), except in the southernmost part of the state where it is overl

...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...nence is 50-250 feet thick in the areas where it is overlain by the Gunter Sandstone or the Oneota Dolomite (fig. Є-13).

...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...he Potsdam Sandstone Megagroup or, as in much of Illinois, the interbedded sandstone and dolomite that is not included in either the Potsdam or the Knox Megagro

...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...verlie Precambrian rocks, and the uppermost Cambrian formation, the Jordan Sandstone, is overlain by the Oneota Dolomite, the oldest Ordovician formation in tha