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| | jordan text |
 | | During the early phases of Upper Mississippi Valley geologic investigations the strata currently differentiated as the Jordan Sandstone were lumped within the Potsdam Sandstone, a unit defined in upper New York State, and traced into Wisconsin, Minnesota and Iowa by Owen (1852) and Hall (1858). |
 | | Calvin (1895), in his report on the geology of Allamakee County, maintained use of term Saint Croix sandstone and recognized that the section at Lansing, Iowa contained strata equivalent to the Jordan of Winchell and the Madison of Irving, but did not employ those terms as formalized stratigraphic names. |
 | | Owen, D.D. (1852) Lower sandstone of the Upper Mississippi, in: Report of a geological survey of Wisconsin, Iowa and Minnesota, Philadelphia p. |
| www.igsb.uiowa.edu /gsi/gb70/jordan2.htm (4043 words) |
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