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| | Maquoketa Group |
 | | In most of the outcrop area in southeastern Indiana the Maquoketa Group is overlain by the Brassfield Limestone, but in small areas the Brassfield is absent, and the shaly Osgood Member of the Salamonie Dolomite, which elsewhere overlies the Brassfield, directly overlies the Maquoketa (Foerste, 1904a; Brown and Lineback, 1966; Nicoll and Rexroad, 1968). |
 | | The Brassfield also overlies the Maquoketa in the subsurface of east-central Indiana, but in western Indiana, where rocks that are laterally equivalent to the Brassfield are assigned to the characteristically cherty Sexton Creek Limestone, that formation overlies the Maquoketa. |
 | | In northeastern Indiana the Maquoketa is overlain by the Manitoulin Dolomite Member of the Cataract Formation (Rexroad, 1980). |
| igs.indiana.edu /geology/structure/compendium/html/comp5kmc.cfm (839 words) |
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