Cook County Atlas Maps in PDF Format

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Ancell Group

Structure on top of the Ancell Group (2.0 mb)
Thickness of the top of the Ancell to the top of the Ironton Formation (1.4 mb)

Topography

Topography of Cook County (2.7 mb)

Eau Clair Formation

Structure on the top of the Eau Claire Formation (2.1 mb)
Thickness of the Eau Claire Formation (912 k)

Galena-Platteville

Structure on top of the Galena Group (2.5 mb)
Thickness of the Galena-Platteville interval (1.4 mb)

Ironton-Galesville

Structure on the top of the Ironton Formation (2.1 mb)
Thickness of the Ironton-Galesville interval (1.4 mb)

Maquoketa Group

Thickness of Maquoketa Group (1.9 mb)

Mt. Simon Formation

Structure on top of the Mt. Simon Formation (2.7 mb)

Quaternary Deposits

Thickness of the Quaternary deposits (2.7 mb)

Silurian Strata

Thickness of the Silurian strata (4.8 mb)